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VisaApiTests/Tests/Application/Validation/Applicants/NameModelValidatorTests.cs

@@ -0,0 +1,170 @@
+using System.Text;
+using ApplicationLayer.Services.Applicants.Models;
+using ApplicationLayer.Services.Applicants.Models.Validation;
+using Domains;
+using FluentAssertions;
+using FluentValidation;
+using VisaApi.Fakers.Applicants.Requests;
+using Xunit;
+
+namespace VisaApi.Tests.Application.Validation.Applicants;
+
+public class NameModelValidatorTests
+{
+    private readonly static IValidator<NameModel> validator = new NameModelValidator();
+    private readonly static NameModelFaker faker = new();
+
+    /// <summary>
+    /// Test for <see cref="NameModel"/> validator that should throw for empty first name
+    /// </summary>
+    [Fact]
+    private async Task ValidateForEmptyFirstNameShouldThrow()
+    {
+        var name = faker.Generate();
+        name.FirstName = null!;
+
+        var result = await validator.ValidateAsync(name);
+
+        result.Errors.Where(error => error.PropertyName == nameof(name.FirstName))
+            .Should().HaveCount(1);
+    }
+
+    /// <summary>
+    /// Test for <see cref="NameModel"/> validator that should throw for empty surname
+    /// </summary>
+    [Fact]
+    private async Task ValidateForEmptySurnameShouldThrow()
+    {
+        var name = faker.Generate();
+        name.Surname = null!;
+
+        var result = await validator.ValidateAsync(name);
+
+        result.Errors.Where(error => error.PropertyName == nameof(name.Surname))
+            .Should().HaveCount(1);
+    }
+
+    /// <summary>
+    /// Test for <see cref="NameModel"/> validator that should return no errors for empty patronymic
+    /// </summary>
+    [Fact]
+    private async Task ValidateForEmptyPatronymicShouldReturnNoErrors()
+    {
+        var name = faker.Generate();
+        name.Patronymic = null;
+
+        var result = await validator.ValidateAsync(name);
+
+        result.Errors.Where(error => error.PropertyName == nameof(name.Patronymic))
+            .Should().BeEmpty();
+    }
+
+    /// <summary>
+    /// Test for <see cref="NameModel"/> validator that should return error for too long first name
+    /// </summary>
+    [Fact]
+    private async Task ValidateForLongFirstNameShouldReturnError()
+    {
+        var name = faker.Generate();
+        var stringBuilder = new StringBuilder();
+        stringBuilder.Append('h', ConfigurationConstraints.NameLength + 1);
+        name.FirstName = stringBuilder.ToString();
+
+        var result = await validator.ValidateAsync(name);
+
+        result.Errors.Where(error => error.PropertyName == nameof(name.FirstName))
+            .Should().HaveCount(1);
+    }
+
+    /// <summary>
+    /// Test for <see cref="NameModel"/> validator that should return error for too long surname
+    /// </summary>
+    [Fact]
+    private async Task ValidateForLongSurnameShouldReturnError()
+    {
+        var name = faker.Generate();
+        var stringBuilder = new StringBuilder();
+        stringBuilder.Append('h', ConfigurationConstraints.NameLength + 1);
+        name.Surname = stringBuilder.ToString();
+
+        var result = await validator.ValidateAsync(name);
+
+        result.Errors.Where(error => error.PropertyName == nameof(name.Surname))
+            .Should().HaveCount(1);
+    }
+
+    /// <summary>
+    /// Test for <see cref="NameModel"/> validator that should return error for too long patronymic
+    /// </summary>
+    [Fact]
+    private async Task ValidateForLongPatronymicShouldReturnError()
+    {
+        var name = faker.Generate();
+        var stringBuilder = new StringBuilder();
+        stringBuilder.Append('h', ConfigurationConstraints.NameLength + 1);
+        name.Patronymic = stringBuilder.ToString();
+
+        var result = await validator.ValidateAsync(name);
+
+        result.Errors.Where(error => error.PropertyName == nameof(name.Patronymic))
+            .Should().HaveCount(1);
+    }
+
+    /// <summary>
+    /// Test for <see cref="NameModel"/> validator that should return error for not valid firstname
+    /// </summary>
+    [Fact]
+    private async Task ValidateForNotValidFirstNameShouldReturnError()
+    {
+        var name = faker.Generate();
+        name.FirstName = "&&7!**|";
+
+        var result = await validator.ValidateAsync(name);
+
+        result.Errors.Where(error => error.PropertyName == nameof(name.FirstName))
+            .Should().HaveCount(1);
+    }
+
+    /// <summary>
+    /// Test for <see cref="NameModel"/> validator that should return error for not valid surname
+    /// </summary>
+    [Fact]
+    private async Task ValidateForNotValidSurnameShouldReturnError()
+    {
+        var name = faker.Generate();
+        name.Surname = "&&7!**|";
+
+        var result = await validator.ValidateAsync(name);
+
+        result.Errors.Where(error => error.PropertyName == nameof(name.Surname))
+            .Should().HaveCount(1);
+    }
+
+    /// <summary>
+    /// Test for <see cref="NameModel"/> validator that should return error for not valid patronymic
+    /// </summary>
+    [Fact]
+    private async Task ValidateForNotValidPatronymicShouldReturnError()
+    {
+        var name = faker.Generate();
+        name.Patronymic = "&&7!**|";
+
+        var result = await validator.ValidateAsync(name);
+
+        result.Errors.Where(error => error.PropertyName == nameof(name.Patronymic))
+            .Should().HaveCount(1);
+    }
+
+    /// <summary>
+    /// Test for <see cref="NameModel"/> validator that should return no errors for valid name
+    /// </summary>
+    [Fact]
+    private async Task ValidateForValidNameShouldReturnNoErrors()
+    {
+        var name = faker.Generate();
+
+        var result = await validator.ValidateAsync(name);
+
+        result.Errors.Should().BeEmpty();
+    }
+}

VisaApiTests/Tests/Application/Validation/Applicants/PassportModelValidatorTests.cs

@@ -0,0 +1,174 @@
+using System.Text;
+using ApplicationLayer.InfrastructureServicesInterfaces;
+using ApplicationLayer.Services.Applicants.Models;
+using ApplicationLayer.Services.Applicants.Models.Validation;
+using Domains;
+using FluentAssertions;
+using FluentValidation;
+using VisaApi.Fakers.Applicants.Requests;
+using VisaApi.Services;
+using Xunit;
+
+namespace VisaApi.Tests.Application.Validation.Applicants;
+
+public class PassportModelValidatorTests
+{
+    private readonly static IDateTimeProvider dateTimeProvider = new TestDateTimeProvider();
+    private readonly static IValidator<PassportModel> validator = new PassportModelValidator(dateTimeProvider);
+    private readonly static PassportModelFaker faker = new();
+
+    /// <summary>
+    /// Test for <see cref="PassportModel"/> validator that should return error for empty number
+    /// </summary>
+    [Fact]
+    private async Task ValidateForEmptyNumberShouldReturnError()
+    {
+        var model = faker.Generate();
+        model.Number = string.Empty;
+
+        var result = await validator.ValidateAsync(model);
+
+        result.Errors.Where(error => error.PropertyName == nameof(model.Number))
+            .Should().HaveCount(1);
+    }
+
+    /// <summary>
+    /// Test for <see cref="PassportModel"/> validator that should return error for too long number
+    /// </summary>
+    [Fact]
+    private async Task ValidateForLongNumberShouldReturnError()
+    {
+        var model = faker.Generate();
+        var stringBuilder = new StringBuilder();
+        stringBuilder.Append('d', ConfigurationConstraints.PassportNumberLength + 1);
+        model.Number = stringBuilder.ToString();
+
+        var result = await validator.ValidateAsync(model);
+
+        result.Errors.Where(error => error.PropertyName == nameof(model.Number))
+            .Should().HaveCount(1);
+    }
+
+    /// <summary>
+    /// Test for <see cref="PassportModel"/> validator that should return error for not valid number
+    /// </summary>
+    [Fact]
+    private async Task ValidateForNotValidNumberShouldReturnError()
+    {
+        var model = faker.Generate();
+        model.Number = "&?%$24asd\\]|";
+
+        var result = await validator.ValidateAsync(model);
+
+        result.Errors.Where(error => error.PropertyName == nameof(model.Number))
+            .Should().HaveCount(1);
+    }
+
+    /// <summary>
+    /// Test for <see cref="PassportModel"/> validator that should return error for empty issuer
+    /// </summary>
+    [Fact]
+    private async Task ValidateForEmptyIssuerShouldReturnError()
+    {
+        var model = faker.Generate();
+        model.Issuer = string.Empty;
+
+        var result = await validator.ValidateAsync(model);
+
+        result.Errors.Where(error => error.PropertyName == nameof(model.Issuer))
+            .Should().HaveCount(1);
+    }
+
+    /// <summary>
+    /// Test for <see cref="PassportModel"/> validator that should return error for too long issuer
+    /// </summary>
+    [Fact]
+    private async Task ValidateForLongIssuerShouldReturnError()
+    {
+        var model = faker.Generate();
+        var stringBuilder = new StringBuilder();
+        stringBuilder.Append('d', ConfigurationConstraints.IssuerNameLength + 1);
+        model.Issuer = stringBuilder.ToString();
+
+        var result = await validator.ValidateAsync(model);
+
+        result.Errors.Where(error => error.PropertyName == nameof(model.Issuer))
+            .Should().HaveCount(1);
+    }
+
+    /// <summary>
+    /// Test for <see cref="PassportModel"/> validator that should return error for not valid issuer
+    /// </summary>
+    [Fact]
+    private async Task ValidateForNotValidIssuerShouldReturnError()
+    {
+        var model = faker.Generate();
+        model.Issuer = "&?%$24asd\\]|";
+
+        var result = await validator.ValidateAsync(model);
+
+        result.Errors.Where(error => error.PropertyName == nameof(model.Issuer))
+            .Should().HaveCount(1);
+    }
+
+    /// <summary>
+    /// Test for <see cref="PassportModel"/> validator that should return error for expired passport
+    /// </summary>
+    [Fact]
+    private async Task ValidateForExpiredPassportShouldReturnError()
+    {
+        var model = faker.Generate();
+        model.ExpirationDate = dateTimeProvider.Now().AddDays(-10);
+        model.IssueDate = model.ExpirationDate.AddDays(-10);
+
+        var result = await validator.ValidateAsync(model);
+
+        result.Errors.Where(error => error.PropertyName == nameof(model.ExpirationDate))
+            .Should().HaveCount(1);
+    }
+
+    /// <summary>
+    /// Test for <see cref="PassportModel"/> validator that should return error for passport from future
+    /// </summary>
+    [Fact]
+    private async Task ValidateForPassportFromFutureShouldReturnError()
+    {
+        var model = faker.Generate();
+        model.ExpirationDate = dateTimeProvider.Now().AddDays(10);
+        model.IssueDate = model.ExpirationDate.AddDays(-3);
+
+        var result = await validator.ValidateAsync(model);
+
+        result.Errors.Where(error => error.PropertyName == nameof(model.IssueDate))
+            .Should().HaveCount(1);
+    }
+
+    /// <summary>
+    /// Test for <see cref="PassportModel"/> validator that should return error for passport that expired before issue
+    /// </summary>
+    [Fact]
+    private async Task ValidateForPassportExpiredBeforeIssueShouldReturnError()
+    {
+        var model = faker.Generate();
+        model.ExpirationDate = dateTimeProvider.Now().AddDays(10);
+        model.IssueDate = model.ExpirationDate.AddDays(3);
+
+        var result = await validator.ValidateAsync(model);
+
+        result.Errors.Where(error => error.PropertyName == nameof(model.IssueDate))
+            .Should().HaveCount(1);
+    }
+
+    /// <summary>
+    /// Test for <see cref="PassportModel"/> validator that should return no errors for valid passport
+    /// </summary>
+    [Fact]
+    private async Task ValidateForValidPassportShouldReturnNoErrors()
+    {
+        var model = faker.Generate();
+
+        var result = await validator.ValidateAsync(model);
+
+        result.Errors.Should().BeEmpty();
+    }
+}

VisaApiTests/Tests/Application/Validation/Applicants/PlaceOfWorkModelValidatorTests.cs

@@ -0,0 +1,353 @@
+using System.Text;
+using ApplicationLayer.Services.Applicants.Models;
+using ApplicationLayer.Services.Applicants.Models.Validation;
+using Domains;
+using FluentAssertions;
+using FluentValidation;
+using VisaApi.Fakers.Applicants.Requests;
+using Xunit;
+
+namespace VisaApi.Tests.Application.Validation.Applicants;
+
+public class PlaceOfWorkModelValidatorTests
+{
+    private readonly static IValidator<PlaceOfWorkModel> validator = new PlaceOfWorkModelValidator();
+    private readonly static PlaceOfWorkModelFaker faker = new();
+
+    /// <summary>
+    /// Test for <see cref="PlaceOfWorkModel"/> validator that should return error for empty phone num
+    /// </summary>
+    [Fact]
+    private async Task ValidateForEmptyPhoneNumShouldReturnError()
+    {
+        var model = faker.Generate();
+        model.PhoneNum = string.Empty;
+
+        var result = await validator.ValidateAsync(model);
+
+        result.Errors.Where(error => error.PropertyName == nameof(model.PhoneNum))
+            .Should().NotBeEmpty();
+    }
+
+    /// <summary>
+    /// Test for <see cref="PlaceOfWorkModel"/> validator that should return error for long phone num
+    /// </summary>
+    [Fact]
+    private async Task ValidateForLongPhoneNumShouldReturnError()
+    {
+        var model = faker.Generate();
+        var stringBuilder = new StringBuilder();
+        stringBuilder.Append('8', ConfigurationConstraints.PhoneNumberLength + 1);
+        model.PhoneNum = stringBuilder.ToString();
+
+        var result = await validator.ValidateAsync(model);
+
+        result.Errors.Where(error => error.PropertyName == nameof(model.PhoneNum))
+            .Should().NotBeEmpty();
+    }
+
+    /// <summary>
+    /// Test for <see cref="PlaceOfWorkModel"/> validator that should return error for short phone num
+    /// </summary>
+    [Fact]
+    private async Task ValidateForShortPhoneNumShouldReturnError()
+    {
+        var model = faker.Generate();
+        var stringBuilder = new StringBuilder();
+        stringBuilder.Append('8', ConfigurationConstraints.PhoneNumberMinLength - 1);
+        model.PhoneNum = stringBuilder.ToString();
+
+        var result = await validator.ValidateAsync(model);
+
+        result.Errors.Where(error => error.PropertyName == nameof(model.PhoneNum))
+            .Should()
+            .HaveCount(1);
+    }
+
+    /// <summary>
+    /// Test for <see cref="PlaceOfWorkModel"/> validator that should return error for not valid phone num
+    /// </summary>
+    [Fact]
+    private async Task ValidateForNotValidPhoneNumShouldReturnError()
+    {
+        var model = faker.Generate();
+        var stringBuilder = new StringBuilder();
+        stringBuilder.Append('a', ConfigurationConstraints.PhoneNumberMinLength);
+        model.PhoneNum = stringBuilder.ToString();
+
+        var result = await validator.ValidateAsync(model);
+
+        result.Errors.Where(error => error.PropertyName == nameof(model.PhoneNum))
+            .Should()
+            .HaveCount(1);
+    }
+
+    /// <summary>
+    /// Test for <see cref="PlaceOfWorkModel"/> validator that should throw exception for null address
+    /// </summary>
+    [Fact]
+    private async Task ValidateForEmptyAddressShouldThrow()
+    {
+        var model = faker.Generate();
+        model.Address = null!;
+        NullReferenceException? result = null;
+
+        try
+        {
+            await validator.ValidateAsync(model);
+        }
+        catch (Exception e)
+        {
+            result = e as NullReferenceException;
+        }
+
+        result.Should().NotBeNull();
+    }
+
+    /// <summary>
+    /// Test for <see cref="PlaceOfWorkModel"/> validator that should return error for empty Country
+    /// </summary>
+    [Fact]
+    private async Task ValidateForEmptyCountryShouldReturnError()
+    {
+        var model = faker.Generate();
+        model.Address.Country = "";
+
+        var result = await validator.ValidateAsync(model);
+
+        result.Errors.Where(error => error.PropertyName == "Address.Country")
+            .Should().HaveCount(1);
+    }
+
+    /// <summary>
+    /// Test for <see cref="PlaceOfWorkModel"/> validator that should return error for too long Country
+    /// </summary>
+    [Fact]
+    private async Task ValidateForLongCountryShouldReturnError()
+    {
+        var model = faker.Generate();
+        var stringBuilder = new StringBuilder();
+        stringBuilder.Append('a', ConfigurationConstraints.CountryNameLength + 1);
+        model.Address.Country = stringBuilder.ToString();
+
+        var result = await validator.ValidateAsync(model);
+
+        result.Errors.Where(error => error.PropertyName == "Address.Country")
+            .Should().HaveCount(1);
+    }
+
+    /// <summary>
+    /// Test for <see cref="PlaceOfWorkModel"/> validator that should return error for not valid Country
+    /// </summary>
+    [Fact]
+    private async Task ValidateForNotValidCountryShouldReturnError()
+    {
+        var model = faker.Generate();
+        model.Address.Country = "|&%";
+
+        var result = await validator.ValidateAsync(model);
+
+        result.Errors.Where(error => error.PropertyName == "Address.Country")
+            .Should().HaveCount(1);
+    }
+
+    /// <summary>
+    /// Test for <see cref="PlaceOfWorkModel"/> validator that should return error for empty City
+    /// </summary>
+    [Fact]
+    private async Task ValidateForEmptyCityShouldReturnError()
+    {
+        var model = faker.Generate();
+        model.Address.City = "";
+
+        var result = await validator.ValidateAsync(model);
+
+        result.Errors.Where(error => error.PropertyName == "Address.City")
+            .Should().HaveCount(1);
+    }
+
+    /// <summary>
+    /// Test for <see cref="PlaceOfWorkModel"/> validator that should return error for too long city
+    /// </summary>
+    [Fact]
+    private async Task ValidateForLongCityShouldReturnError()
+    {
+        var model = faker.Generate();
+        var stringBuilder = new StringBuilder();
+        stringBuilder.Append('a', ConfigurationConstraints.CityNameLength + 1);
+        model.Address.City = stringBuilder.ToString();
+
+        var result = await validator.ValidateAsync(model);
+
+        result.Errors.Where(error => error.PropertyName == "Address.City")
+            .Should().HaveCount(1);
+    }
+
+    /// <summary>
+    /// Test for <see cref="PlaceOfWorkModel"/> validator that should return error for not valid city
+    /// </summary>
+    [Fact]
+    private async Task ValidateForNotValidCityShouldReturnError()
+    {
+        var model = faker.Generate();
+        model.Address.City = "|&%";
+
+        var result = await validator.ValidateAsync(model);
+
+        result.Errors.Where(error => error.PropertyName == "Address.City")
+            .Should().HaveCount(1);
+    }
+
+    /// <summary>
+    /// Test for <see cref="PlaceOfWorkModel"/> validator that should return error for empty street
+    /// </summary>
+    [Fact]
+    private async Task ValidateForEmptyStreetShouldReturnError()
+    {
+        var model = faker.Generate();
+        model.Address.Street = "";
+
+        var result = await validator.ValidateAsync(model);
+
+        result.Errors.Where(error => error.PropertyName == "Address.Street")
+            .Should().HaveCount(1);
+    }
+
+    /// <summary>
+    /// Test for <see cref="PlaceOfWorkModel"/> validator that should return error for too long street
+    /// </summary>
+    [Fact]
+    private async Task ValidateForLongStreetShouldReturnError()
+    {
+        var model = faker.Generate();
+        var stringBuilder = new StringBuilder();
+        stringBuilder.Append('a', ConfigurationConstraints.StreetNameLength + 1);
+        model.Address.Street = stringBuilder.ToString();
+
+        var result = await validator.ValidateAsync(model);
+
+        result.Errors.Where(error => error.PropertyName == "Address.Street")
+            .Should().HaveCount(1);
+    }
+
+    /// <summary>
+    /// Test for <see cref="PlaceOfWorkModel"/> validator that should return error for not valid street
+    /// </summary>
+    [Fact]
+    private async Task ValidateForNotValidStreetShouldReturnError()
+    {
+        var model = faker.Generate();
+        model.Address.Street = "|&%";
+
+        var result = await validator.ValidateAsync(model);
+
+        result.Errors.Where(error => error.PropertyName == "Address.Street")
+            .Should().HaveCount(1);
+    }
+
+    /// <summary>
+    /// Test for <see cref="PlaceOfWorkModel"/> validator that should return error for empty building        /// </summary>
+    [Fact]
+    private async Task ValidateForEmptyBuildingShouldReturnError()
+    {
+        var model = faker.Generate();
+        model.Address.Building = "";
+
+        var result = await validator.ValidateAsync(model);
+
+        result.Errors.Where(error => error.PropertyName == "Address.Building")
+            .Should().HaveCount(1);
+    }
+
+    /// <summary>
+    /// Test for <see cref="PlaceOfWorkModel"/> validator that should return error for too long building
+    /// </summary>
+    [Fact]
+    private async Task ValidateForLongBuildingShouldReturnError()
+    {
+        var model = faker.Generate();
+        var stringBuilder = new StringBuilder();
+        stringBuilder.Append('a', ConfigurationConstraints.BuildingNumberLength + 1);
+        model.Address.Building = stringBuilder.ToString();
+
+        var result = await validator.ValidateAsync(model);
+
+        result.Errors.Where(error => error.PropertyName == "Address.Building")
+            .Should().HaveCount(1);
+    }
+
+    /// <summary>
+    /// Test for <see cref="PlaceOfWorkModel"/> validator that should return error for not valid building
+    /// </summary>
+    [Fact]
+    private async Task ValidateForNotValidBuildingShouldReturnError()
+    {
+        var model = faker.Generate();
+        model.Address.Building = "|&%";
+
+        var result = await validator.ValidateAsync(model);
+
+        result.Errors.Where(error => error.PropertyName == "Address.Building")
+            .Should().HaveCount(1);
+    }
+
+    /// <summary>
+    /// Test for <see cref="PlaceOfWorkModel"/> validator that should return error for empty name
+    /// </summary>
+    [Fact]
+    private async Task ValidateForEmptyNameShouldReturnError()
+    {
+        var model = faker.Generate();
+        model.Name = "";
+
+        var result = await validator.ValidateAsync(model);
+
+        result.Errors.Where(error => error.PropertyName == nameof(model.Name))
+            .Should().HaveCount(1);
+    }
+
+    /// <summary>
+    /// Test for <see cref="PlaceOfWorkModel"/> validator that should return error for too long name
+    /// </summary>
+    [Fact]
+    private async Task ValidateForTooLongNameShouldReturnError()
+    {
+        var model = faker.Generate();
+        var stringBuilder = new StringBuilder();
+        stringBuilder.Append('g', ConfigurationConstraints.PlaceOfWorkNameLength + 1);
+        model.Name = stringBuilder.ToString();
+
+        var result = await validator.ValidateAsync(model);
+
+        result.Errors.Where(error => error.PropertyName == nameof(model.Name))
+            .Should().HaveCount(1);
+    }
+
+    /// <summary>
+    /// Test for <see cref="PlaceOfWorkModel"/> validator that should return error for not valid name
+    /// </summary>
+    [Fact]
+    private async Task ValidateForNotValidNameShouldReturnError()
+    {
+        var model = faker.Generate();
+        model.Name = "@$%&|";
+
+        var result = await validator.ValidateAsync(model);
+
+        result.Errors.Where(error => error.PropertyName == nameof(model.Name))
+            .Should().HaveCount(1);
+    }
+
+    /// <summary>
+    /// Test for <see cref="PlaceOfWorkModel"/> validator that should return no errors for valid model
+    /// </summary>
+    [Fact]
+    private async Task ValidateForValidShouldReturnNoErrors()
+    {
+        var model = faker.Generate();
+
+        var result = await validator.ValidateAsync(model);
+
+        result.Errors.Should().BeEmpty();
+    }
+}

VisaApiTests/Tests/Application/Validation/Auth/AuthDataValidatorTests.cs

@@ -0,0 +1,113 @@
+using System.Text;
+using ApplicationLayer.Services.AuthServices.Common;
+using ApplicationLayer.Services.AuthServices.Requests.Validation;
+using Domains;
+using FluentAssertions;
+using FluentValidation;
+using VisaApi.Fakers.Auth;
+using Xunit;
+
+namespace VisaApi.Tests.Application.Validation.Auth;
+
+public class AuthDataValidatorTests
+{
+    private readonly static IValidator<AuthData> validator = new AuthDataValidator();
+    private readonly static AuthDataFaker faker = new();
+
+    /// <summary>
+    /// Test for <see cref="AuthData"/> validator that should return validation error for invalid email
+    /// </summary>
+    [Fact]
+    private async Task ValidateForInvalidEmailShouldReturnError()
+    {
+            var authData = faker.Generate();
+            authData.Email = "alsdas'dsa";
+
+            var result = await validator.ValidateAsync(authData);
+
+            result.Errors.Should()
+                .HaveCount(1)
+                .And.Contain(error => error.PropertyName == nameof(authData.Email));
+        }
+
+    /// <summary>
+    /// Test for <see cref="AuthData"/> validator that should return validation error for too long email
+    /// </summary>
+    [Fact]
+    private async Task ValidateForLongEmailShouldReturnError()
+    {
+            var authData = faker.Generate();
+            var stringBuilder = new StringBuilder();
+            stringBuilder.Append('d', ConfigurationConstraints.EmailLength);
+            stringBuilder.Append("@mail.ru");
+            authData.Email = stringBuilder.ToString();
+
+            var result = await validator.ValidateAsync(authData);
+
+            result.Errors.Should()
+                .HaveCount(1)
+                .And.Contain(error => error.PropertyName == nameof(authData.Email));
+        }
+
+    /// <summary>
+    /// Test for <see cref="AuthData"/> validator that should return no errors for valid email
+    /// </summary>
+    [Fact]
+    private async Task ValidateForValidEmailShouldReturnNoError()
+    {
+            var authData = faker.Generate();
+
+            var result = await validator.ValidateAsync(authData);
+
+            result.Errors.Where(error => error.PropertyName == nameof(authData.Email))
+                .Should().BeEmpty();
+        }
+
+    /// <summary>
+    /// Test for <see cref="AuthData"/> validator that should return validation error for empty password
+    /// </summary>
+    [Fact]
+    private async Task ValidateForEmptyPasswordShouldReturnError()
+    {
+            var authData = faker.Generate();
+            authData.Password = string.Empty;
+
+            var result = await validator.ValidateAsync(authData);
+
+            result.Errors.Should()
+                .HaveCount(1)
+                .And.Contain(error => error.PropertyName == nameof(authData.Password));
+        }
+
+    /// <summary>
+    /// Test for <see cref="AuthData"/> validator that should return validation error for too long password
+    /// </summary>
+    [Fact]
+    private async Task ValidateForLongPasswordShouldReturnError()
+    {
+            var authData = faker.Generate();
+            var stringBuilder = new StringBuilder();
+            stringBuilder.Append('d', ConfigurationConstraints.PasswordLength + 1);
+            authData.Password = stringBuilder.ToString();
+
+            var result = await validator.ValidateAsync(authData);
+
+            result.Errors.Should()
+                .HaveCount(1)
+                .And.Contain(error => error.PropertyName == nameof(authData.Password));
+        }
+
+    /// <summary>
+    /// Test for <see cref="AuthData"/> validator that should return no errors for valid password
+    /// </summary>
+    [Fact]
+    private async Task ValidateForValidPasswordShouldReturnNoError()
+    {
+            var authData = faker.Generate();
+
+            var result = await validator.ValidateAsync(authData);
+
+            result.Errors.Where(error => error.PropertyName == nameof(authData.Password))
+                .Should().BeEmpty();
+        }
+}

VisaApiTests/Tests/Application/Validation/Auth/RegisterApplicantRequestValidatorTests.cs

@@ -0,0 +1,73 @@
+using ApplicationLayer.Services.Applicants.Models.Validation;
+using ApplicationLayer.Services.AuthServices.Requests;
+using ApplicationLayer.Services.AuthServices.Requests.Validation;
+using Domains.ApplicantDomain;
+using FluentValidation.TestHelper;
+using Infrastructure.Database.Users.Repositories;
+using VisaApi.Fakers.Auth;
+using VisaApi.Services;
+using VisaApi.Tests.Infrastructure.Database;
+using Xunit;
+
+namespace VisaApi.Tests.Application.Validation.Auth
+{
+    public class RegisterApplicantRequestValidatorTests
+    {
+        private readonly RegisterApplicantRequestValidator validator;
+        private RegisterApplicantRequestFaker requestFaker;
+
+        public RegisterApplicantRequestValidatorTests()
+        {
+            var context = InMemoryContextProvider.GetDbContext();
+            var dateTimeProvider = new TestDateTimeProvider();
+            requestFaker = new(dateTimeProvider);
+            validator = new(
+                dateTimeProvider,
+                new NameModelValidator(),
+                new RegisterRequestValidator(new UsersRepository(context, context), new AuthDataValidator()),
+                new PassportModelValidator(dateTimeProvider),
+                new PlaceOfWorkModelValidator()
+            );
+        }
+
+        /// <summary>
+        /// Validation should return no errors
+        /// </summary>
+        [Fact]
+        public async Task ValidateShouldWork()
+        {
+            var request = requestFaker.Generate();
+
+            var result = await validator.TestValidateAsync(request);
+
+            result.ShouldNotHaveAnyValidationErrors();
+        }
+
+        /// <summary>
+        /// Validation should return errors
+        /// </summary>
+        [Fact]
+        public async Task ValidateShouldFail()
+        {
+            var request = new RegisterApplicantRequest
+            {
+                BirthDate = DateTime.Now,
+                Citizenship = string.Empty,
+                CitizenshipByBirth = string.Empty,
+                CityOfBirth = string.Empty,
+                CountryOfBirth = string.Empty,
+                Gender = (Gender)123123,
+                JobTitle = string.Empty,
+                MaritalStatus = (MaritalStatus)123123,
+            };
+
+            var result = await validator.TestValidateAsync(request);
+
+            var properties = request.GetType().GetProperties().Select(x => x.Name).Except([nameof(RegisterApplicantRequest.IsNonResident)]);
+            foreach (var property in properties)
+            {
+                result.ShouldHaveValidationErrorFor(property);
+            }
+        }
+    }
+}

VisaApiTests/Tests/Application/Validation/Auth/RegisterRequestValidatorTests.cs

@@ -0,0 +1,92 @@
+using ApplicationLayer.Services.AuthServices.Common;
+using ApplicationLayer.Services.AuthServices.Requests;
+using ApplicationLayer.Services.AuthServices.Requests.Validation;
+using FluentAssertions;
+using FluentValidation;
+using Infrastructure.Database;
+using Infrastructure.Database.Users.Repositories;
+using VisaApi.Fakers.Auth;
+using VisaApi.Fakers.Users;
+using VisaApi.Tests.Infrastructure.Database;
+using Xunit;
+
+namespace VisaApi.Tests.Application.Validation.Auth;
+
+[Collection(Collections.ContextUsingTestCollection)]
+public class RegisterRequestValidatorTests
+{
+    private readonly static IValidator<AuthData> authDataValidator = new AuthDataValidator();
+    private readonly static RegisterRequestFaker requestFaker = new();
+    private readonly static UserFaker userFaker = new();
+
+    /// <summary>
+    /// Creates validator from context
+    /// </summary>
+    /// <param name="context">db context</param>
+    /// <returns>RegisterRequest validator</returns>
+    private static IValidator<RegisterRequest> GetValidator(DatabaseContext context)
+    {
+            var repository = new UsersRepository(context, context);
+            return new RegisterRequestValidator(repository, authDataValidator);
+        }
+
+    /// <summary>
+    /// Test for <see cref="RegisterRequest"/> validator that should throw for empty auth data
+    /// </summary>
+    [Fact]
+    private async Task ValidateForEmptyAuthDataShouldThrow()
+    {
+            var context = InMemoryContextProvider.GetDbContext();
+            var validator = GetValidator(context);
+            var request = requestFaker.Generate();
+            request.AuthData = null!;
+            NullReferenceException? result = null;
+
+            try
+            {
+                await validator.ValidateAsync(request);
+            }
+            catch (Exception e)
+            {
+                result = e as NullReferenceException;
+            }
+
+            result.Should().NotBeNull();
+        }
+
+    /// <summary>
+    /// Test for <see cref="RegisterRequest"/> validator that should return error for used email
+    /// </summary>
+    [Fact]
+    private async Task ValidateForUsedEmailShouldReturnError()
+    {
+            var context = InMemoryContextProvider.GetDbContext();
+            var validator = GetValidator(context);
+            var user = userFaker.Generate();
+            await context.AddAsync(user);
+            await context.SaveChangesAsync();
+            var request = requestFaker.Generate();
+            request.AuthData.Email = user.Email;
+
+            var result = await validator.ValidateAsync(request);
+
+            result.Errors.Should()
+                .Contain(error => error.PropertyName == nameof(request.AuthData))
+                .And.HaveCount(1);
+        }
+
+    /// <summary>
+    /// Test for <see cref="RegisterRequest"/> validator that should return o errors for valid requests
+    /// </summary>
+    [Fact]
+    private async Task ValidateForValidRequestShouldReturnNoErrors()
+    {
+            var context = InMemoryContextProvider.GetDbContext();
+            var validator = GetValidator(context);
+            var request = requestFaker.Generate();
+
+            var result = await validator.ValidateAsync(request);
+
+            result.Errors.Should().BeEmpty();
+        }
+}

VisaApiTests/Tests/Application/Validation/Users/ChangeUserAuthDataRequestValidationTests.cs

@@ -0,0 +1,48 @@
+using ApplicationLayer.Services.Users.Requests;
+using ApplicationLayer.Services.Users.Requests.Validation;
+using FluentAssertions;
+using FluentValidation;
+using VisaApi.Fakers.Users.Requests;
+using Xunit;
+
+namespace VisaApi.Tests.Application.Validation.Users;
+
+public class ChangeUserAuthDataRequestValidationTests
+{
+    private readonly static IValidator<ChangeUserAuthDataRequest> validator = new ChangeUserAuthDataRequestValidator();
+    private readonly static ChangeUserAuthDataRequestFaker faker = new();
+
+    /// <summary>
+    /// Test for <see cref="ChangeUserAuthDataRequest"/> validator that should throw exception for empty auth data
+    /// </summary>
+    [Fact]
+    private async Task ValidateForEmptyAuthDataShouldThrow()
+    {
+        var request = faker.Generate();
+        request.NewAuthData = null!;
+        NullReferenceException? result = null;
+
+        try
+        {
+            await validator.ValidateAsync(request);
+        }
+        catch (Exception e)
+        {
+            result = e as NullReferenceException;
+        }
+
+        result.Should().NotBeNull();
+    }
+
+    /// <summary>
+    /// Test for <see cref="ChangeUserAuthDataRequest"/> validator that should no errors for valid entity
+    /// </summary>
+    [Fact]
+    private async Task ValidateForValidShouldReturnNoErrors()
+    {
+        var request = faker.Generate();
+        var result = await validator.ValidateAsync(request);
+
+        result.IsValid.Should().BeTrue();
+    }
+}

VisaApiTests/Tests/Application/Validation/VisaApplications/PastVisaModelValidatorTests.cs

@@ -0,0 +1,140 @@
+using System.Text;
+using ApplicationLayer.InfrastructureServicesInterfaces;
+using ApplicationLayer.Services.VisaApplications.Models;
+using ApplicationLayer.Services.VisaApplications.Models.Validation;
+using Domains;
+using FluentAssertions;
+using FluentValidation;
+using VisaApi.Fakers.VisaApplications.Requests;
+using VisaApi.Services;
+using Xunit;
+
+namespace VisaApi.Tests.Application.Validation.VisaApplications
+{
+    public class PastVisaModelValidatorTests
+    {
+        private readonly static IDateTimeProvider dateTimeProvider = new TestDateTimeProvider();
+        private readonly static IValidator<PastVisaModel> validator = new PastVisaModelValidator(dateTimeProvider);
+        private readonly static PastVisaModelFaker faker = new(dateTimeProvider);
+
+        /// <summary>
+        /// Test for <see cref="PastVisaModel"/> validator that should return error for empty expiration date
+        /// </summary>
+        [Fact]
+        private async Task ValidateForEmptyExpirationDateShouldReturnError()
+        {
+            var model = faker.GenerateValid();
+            model.ExpirationDate = new();
+
+            var result = await validator.ValidateAsync(model);
+
+            result.Errors.Where(error => error.PropertyName == nameof(model.ExpirationDate))
+                .Should().HaveCount(2); //expected error + error because of expiration date less than issue date
+        }
+
+        /// <summary>
+        /// Test for <see cref="PastVisaModel"/> validator that should return error for expiration date less than issue date
+        /// </summary>
+        [Fact]
+        private async Task ValidateForExpirationDateLessThanIssueDateShouldReturnError()
+        {
+            var model = faker.GenerateValid();
+            model.ExpirationDate = model.IssueDate.AddDays(-4);
+
+            var result = await validator.ValidateAsync(model);
+
+            result.Errors.Where(error => error.PropertyName == nameof(model.ExpirationDate))
+                .Should().HaveCount(1);
+        }
+
+        /// <summary>
+        /// Test for <see cref="PastVisaModel"/> validator that should return error for empty issue date
+        /// </summary>
+        [Fact]
+        private async Task ValidateForEmptyIssueDateShouldReturnError()
+        {
+            var model = faker.GenerateValid();
+            model.IssueDate = new();
+
+            var result = await validator.ValidateAsync(model);
+
+            result.Errors.Where(error => error.PropertyName == nameof(model.IssueDate))
+                .Should().HaveCount(1);
+        }
+
+        /// <summary>
+        /// Test for <see cref="PastVisaModel"/> validator that should return error for issue date greater than current date
+        /// </summary>
+        [Fact]
+        private async Task ValidateForIssueDateGreaterThanCurrentDateShouldReturnError()
+        {
+            var model = faker.GenerateValid();
+            model.IssueDate = dateTimeProvider.Now().AddDays(4);
+
+            var result = await validator.ValidateAsync(model);
+
+            result.Errors.Where(error => error.PropertyName == nameof(model.IssueDate))
+                .Should().HaveCount(1);
+        }
+
+        /// <summary>
+        /// Test for <see cref="PastVisaModel"/> validator that should return error for empty name
+        /// </summary>
+        [Fact]
+        private async Task ValidateForEmptyNameShouldReturnError()
+        {
+            var model = faker.GenerateValid();
+            model.Name = string.Empty;
+
+            var result = await validator.ValidateAsync(model);
+
+            result.Errors.Where(error => error.PropertyName == nameof(model.Name))
+                .Should().HaveCount(1);
+        }
+
+        /// <summary>
+        /// Test for <see cref="PastVisaModel"/> validator that should return error for too long name
+        /// </summary>
+        [Fact]
+        private async Task ValidateForTooLongNameShouldReturnError()
+        {
+            var model = faker.GenerateValid();
+            var stringBuilder = new StringBuilder();
+            stringBuilder.Append('d', ConfigurationConstraints.VisaNameLength + 1);
+            model.Name = stringBuilder.ToString();
+
+            var result = await validator.ValidateAsync(model);
+
+            result.Errors.Where(error => error.PropertyName == nameof(model.Name))
+                .Should().HaveCount(1);
+        }
+
+        /// <summary>
+        /// Test for <see cref="PastVisaModel"/> validator that should return error for not valid name
+        /// </summary>
+        [Fact]
+        private async Task ValidateForNotValidNameShouldReturnError()
+        {
+            var model = faker.GenerateValid();
+            model.Name = "|}{%^&";
+
+            var result = await validator.ValidateAsync(model);
+
+            result.Errors.Where(error => error.PropertyName == nameof(model.Name))
+                .Should().HaveCount(1);
+        }
+
+        /// <summary>
+        /// Test for <see cref="PastVisaModel"/> validator that should return no errors for valid model
+        /// </summary>
+        [Fact]
+        private async Task ValidateForValidShouldReturnNoErrors()
+        {
+            var model = faker.GenerateValid();
+
+            var result = await validator.ValidateAsync(model);
+
+            result.Errors.Should().BeEmpty();
+        }
+    }
+}

VisaApiTests/Tests/Application/Validation/VisaApplications/PastVisitModelValidatorTests.cs

@@ -0,0 +1,142 @@
+using System.Text;
+using ApplicationLayer.InfrastructureServicesInterfaces;
+using ApplicationLayer.Services.VisaApplications.Models;
+using ApplicationLayer.Services.VisaApplications.Models.Validation;
+using Domains;
+using FluentAssertions;
+using FluentValidation;
+using VisaApi.Fakers.VisaApplications.Requests;
+using VisaApi.Services;
+using Xunit;
+
+namespace VisaApi.Tests.Application.Validation.VisaApplications
+{
+    public class PastVisitModelValidatorTests
+    {
+        private readonly static IDateTimeProvider dateTimeProvider = new TestDateTimeProvider();
+        private readonly static IValidator<PastVisitModel> validator = new PastVisitModelValidator(dateTimeProvider);
+        private readonly static PastVisitModelFaker faker = new(dateTimeProvider);
+
+        /// <summary>
+        /// Test for <see cref="PastVisitModel"/> validator that should return error for empty start date
+        /// </summary>
+        [Fact]
+        private async Task ValidateForEmptyStartDateShouldReturnError()
+        {
+            var model = faker.GenerateValid();
+            model.StartDate = new();
+
+            var result = await validator.ValidateAsync(model);
+
+            result.Errors.Where(error => error.PropertyName == nameof(model.StartDate))
+                .Should().HaveCount(1);
+        }
+
+        /// <summary>
+        /// Test for <see cref="PastVisitModel"/> validator that should return error for start date greater than end date
+        /// </summary>
+        [Fact]
+        private async Task ValidateForStartDateGreaterThanEndDateShouldReturnError()
+        {
+            var model = faker.GenerateValid();
+            model.EndDate = dateTimeProvider.Now().AddDays(-10);
+            model.StartDate = model.EndDate.AddDays(4);
+
+            var result = await validator.ValidateAsync(model);
+
+            result.Errors.Where(error => error.PropertyName == nameof(model.StartDate))
+                .Should().HaveCount(1);
+        }
+
+        /// <summary>
+        /// Test for <see cref="PastVisitModel"/> validator that should return error for empty end date
+        /// </summary>
+        [Fact]
+        private async Task ValidateForEmptyEndDateShouldReturnError()
+        {
+            var model = faker.GenerateValid();
+            model.EndDate = new();
+
+            var result = await validator.ValidateAsync(model);
+
+            result.Errors.Where(error => error.PropertyName == nameof(model.EndDate))
+                .Should().HaveCount(1); //expected error + error because of end date less than start date
+        }
+
+        /// <summary>
+        /// Test for <see cref="PastVisitModel"/> validator that should return error for start date greater than current date
+        /// </summary>
+        [Fact]
+        private async Task ValidateForStartDateGreaterThanCurrentDateShouldReturnError()
+        {
+            var model = faker.GenerateValid();
+            model.StartDate = dateTimeProvider.Now().AddDays(4);
+            model.EndDate = model.StartDate.AddDays(4);
+
+            var result = await validator.ValidateAsync(model);
+
+            result.Errors.Where(error => error.PropertyName == nameof(model.StartDate))
+                .Should().HaveCount(1);
+        }
+
+        /// <summary>
+        /// Test for <see cref="PastVisitModel"/> validator that should return error for empty destination Country
+        /// </summary>
+        [Fact]
+        private async Task ValidateForEmptyDestinationCountryShouldReturnError()
+        {
+            var model = faker.GenerateValid();
+            model.DestinationCountry = string.Empty;
+
+            var result = await validator.ValidateAsync(model);
+
+            result.Errors.Where(error => error.PropertyName == nameof(model.DestinationCountry))
+                .Should().HaveCount(1);
+        }
+
+        /// <summary>
+        /// Test for <see cref="PastVisitModel"/> validator that should return error for too long destination Country
+        /// </summary>
+        [Fact]
+        private async Task ValidateForTooLongDestinationCountryShouldReturnError()
+        {
+            var model = faker.GenerateValid();
+            var stringBuilder = new StringBuilder();
+            stringBuilder.Append('d', ConfigurationConstraints.CountryNameLength + 1);
+            model.DestinationCountry = stringBuilder.ToString();
+
+            var result = await validator.ValidateAsync(model);
+
+            result.Errors.Where(error => error.PropertyName == nameof(model.DestinationCountry))
+                .Should().HaveCount(1);
+        }
+
+        /// <summary>
+        /// Test for <see cref="PastVisitModel"/> validator that should return error for not valid destination Country
+        /// </summary>
+        [Fact]
+        private async Task ValidateForNotValidDestinationCountryShouldReturnError()
+        {
+            var model = faker.GenerateValid();
+            model.DestinationCountry = "|}{%^&";
+
+            var result = await validator.ValidateAsync(model);
+
+            result.Errors.Where(error => error.PropertyName == nameof(model.DestinationCountry))
+                .Should().HaveCount(1);
+        }
+
+        /// <summary>
+        /// Test for <see cref="PastVisitModel"/> validator that should return no errors for valid model
+        /// </summary>
+        [Fact]
+        private async Task ValidateForValidShouldReturnNoErrors()
+        {
+            var model = faker.GenerateValid();
+
+            var result = await validator.ValidateAsync(model);
+
+            result.Errors.Should().BeEmpty();
+        }
+    }
+}

VisaApiTests/Tests/Application/Validation/VisaApplications/PermissionToDestCountryModelValidatorTests.cs

@@ -0,0 +1,110 @@
+using System.Text;
+using ApplicationLayer.InfrastructureServicesInterfaces;
+using ApplicationLayer.Services.VisaApplications.Models;
+using ApplicationLayer.Services.VisaApplications.Models.Validation;
+using Domains;
+using FluentAssertions;
+using FluentValidation;
+using VisaApi.Fakers.VisaApplications.Requests;
+using VisaApi.Services;
+using Xunit;
+
+namespace VisaApi.Tests.Application.Validation.VisaApplications
+{
+    public class PermissionToDestCountryModelValidatorTests
+    {
+        private readonly static IDateTimeProvider dateTimeProvider = new TestDateTimeProvider();
+        private readonly static IValidator<PermissionToDestCountryModel> validator = new PermissionToDestCountryModelValidator(dateTimeProvider);
+        private readonly static PermissionToDestCountryModelFaker faker = new(dateTimeProvider);
+
+        /// <summary>
+        /// Test for <see cref="PermissionToDestCountryModel"/> validator that should return error for empty expiration date
+        /// </summary>
+        [Fact]
+        private async Task ValidateForEmptyExpirationDateShouldReturnError()
+        {
+            var model = faker.Generate();
+            model.ExpirationDate = new();
+
+            var result = await validator.ValidateAsync(model);
+
+            result.Errors.Where(error => error.PropertyName == nameof(model.ExpirationDate))
+                .Should().HaveCount(2); //expected error + error because of expired
+        }
+
+        /// <summary>
+        /// Test for <see cref="PermissionToDestCountryModel"/> validator that should return error for expiration date less than current date
+        /// </summary>
+        [Fact]
+        private async Task ValidateForExpirationDateLessThanCurrentDateShouldReturnError()
+        {
+            var model = faker.Generate();
+            model.ExpirationDate = dateTimeProvider.Now().AddDays(-1);
+
+            var result = await validator.ValidateAsync(model);
+
+            result.Errors.Where(error => error.PropertyName == nameof(model.ExpirationDate))
+                .Should().HaveCount(1);
+        }
+
+        /// <summary>
+        /// Test for <see cref="PermissionToDestCountryModel"/> validator that should return error for empty issuer
+        /// </summary>
+        [Fact]
+        private async Task ValidateForEmptyIssuerShouldReturnError()
+        {
+            var model = faker.Generate();
+            model.Issuer = string.Empty;
+
+            var result = await validator.ValidateAsync(model);
+
+            result.Errors.Where(error => error.PropertyName == nameof(model.Issuer))
+                .Should().HaveCount(1);
+        }
+
+        /// <summary>
+        /// Test for <see cref="PermissionToDestCountryModel"/> validator that should return error for not valid issuer
+        /// </summary>
+        [Fact]
+        private async Task ValidateForNotValidIssuerShouldReturnError()
+        {
+            var model = faker.Generate();
+            model.Issuer = "}{)(*&*^%#!#!:";
+
+            var result = await validator.ValidateAsync(model);
+
+            result.Errors.Where(error => error.PropertyName == nameof(model.Issuer))
+                .Should().HaveCount(1);
+        }
+
+        /// <summary>
+        /// Test for <see cref="PermissionToDestCountryModel"/> validator that should return error for too long issuer
+        /// </summary>
+        [Fact]
+        private async Task ValidateForTooLongIssuerShouldReturnError()
+        {
+            var model = faker.Generate();
+            var stringBuilder = new StringBuilder();
+            stringBuilder.Append('g', ConfigurationConstraints.IssuerNameLength + 1);
+            model.Issuer = stringBuilder.ToString();
+
+            var result = await validator.ValidateAsync(model);
+
+            result.Errors.Where(error => error.PropertyName == nameof(model.Issuer))
+                .Should().HaveCount(1);
+        }
+
+        /// <summary>
+        /// Test for <see cref="PermissionToDestCountryModel"/> validator that should return no errors for valid model
+        /// </summary>
+        [Fact]
+        private async Task ValidateForValidShouldReturnNoErrors()
+        {
+            var model = faker.Generate();
+
+            var result = await validator.ValidateAsync(model);
+
+            result.Errors.Should().BeEmpty();
+        }
+    }
+}

VisaApiTests/Tests/Application/Validation/VisaApplications/ReentryPermitModelValidatorTests.cs

@@ -0,0 +1,110 @@
+using System.Text;
+using ApplicationLayer.InfrastructureServicesInterfaces;
+using ApplicationLayer.Services.VisaApplications.Models;
+using ApplicationLayer.Services.VisaApplications.Models.Validation;
+using Domains;
+using FluentAssertions;
+using FluentValidation;
+using VisaApi.Fakers.VisaApplications.Requests;
+using VisaApi.Services;
+using Xunit;
+
+namespace VisaApi.Tests.Application.Validation.VisaApplications
+{
+    public class ReentryPermitModelValidatorTests
+    {
+        private readonly static IDateTimeProvider dateTimeProvider = new TestDateTimeProvider();
+        private readonly static IValidator<ReentryPermitModel> validator = new ReentryPermitModelValidator(dateTimeProvider);
+        private readonly static ReentryPermitModelFaker faker = new(dateTimeProvider);
+
+        /// <summary>
+        /// Test for <see cref="ReentryPermitModel"/> validator that should return error for empty expiration date
+        /// </summary>
+        [Fact]
+        private async Task ValidateForEmptyExpirationDateShouldReturnError()
+        {
+            var model = faker.Generate();
+            model.ExpirationDate = new();
+
+            var result = await validator.ValidateAsync(model);
+
+            result.Errors.Where(error => error.PropertyName == nameof(model.ExpirationDate))
+                .Should().HaveCount(2); //expected error + error because of expired
+        }
+
+        /// <summary>
+        /// Test for <see cref="ReentryPermitModel"/> validator that should return error for expiration date less than current date
+        /// </summary>
+        [Fact]
+        private async Task ValidateForExpirationDateLessThanCurrentDateShouldReturnError()
+        {
+            var model = faker.Generate();
+            model.ExpirationDate = dateTimeProvider.Now().AddDays(-1);
+
+            var result = await validator.ValidateAsync(model);
+
+            result.Errors.Where(error => error.PropertyName == nameof(model.ExpirationDate))
+                .Should().HaveCount(1);
+        }
+
+        /// <summary>
+        /// Test for <see cref="ReentryPermitModel"/> validator that should return error for empty number
+        /// </summary>
+        [Fact]
+        private async Task ValidateForEmptyNumberShouldReturnError()
+        {
+            var model = faker.Generate();
+            model.Number = string.Empty;
+
+            var result = await validator.ValidateAsync(model);
+
+            result.Errors.Where(error => error.PropertyName == nameof(model.Number))
+                .Should().HaveCount(1);
+        }
+
+        /// <summary>
+        /// Test for <see cref="ReentryPermitModel"/> validator that should return error for not valid number
+        /// </summary>
+        [Fact]
+        private async Task ValidateForNotValidNumberShouldReturnError()
+        {
+            var model = faker.Generate();
+            model.Number = "}{)(*&*^%#!#!:";
+
+            var result = await validator.ValidateAsync(model);
+
+            result.Errors.Where(error => error.PropertyName == nameof(model.Number))
+                .Should().HaveCount(1);
+        }
+
+        /// <summary>
+        /// Test for <see cref="ReentryPermitModel"/> validator that should return error for too long number
+        /// </summary>
+        [Fact]
+        private async Task ValidateForTooLongNumberShouldReturnError()
+        {
+            var model = faker.Generate();
+            var stringBuilder = new StringBuilder();
+            stringBuilder.Append('g', ConfigurationConstraints.ReentryPermitNumberLength + 1);
+            model.Number = stringBuilder.ToString();
+
+            var result = await validator.ValidateAsync(model);
+
+            result.Errors.Where(error => error.PropertyName == nameof(model.Number))
+                .Should().HaveCount(1);
+        }
+
+        /// <summary>
+        /// Test for <see cref="ReentryPermitModel"/> validator that should return no errors for valid model
+        /// </summary>
+        [Fact]
+        private async Task ValidateForValidShouldReturnNoErrors()
+        {
+            var model = faker.Generate();
+
+            var result = await validator.ValidateAsync(model);
+
+            result.Errors.Should().BeEmpty();
+        }
+    }
+}

VisaApiTests/Tests/Infrastructure/Database/InMemoryContextProvider.cs

@@ -0,0 +1,23 @@
+using Infrastructure.Database;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Diagnostics;
+
+namespace VisaApi.Tests.Infrastructure.Database;
+
+public static class InMemoryContextProvider
+{
+    private static DbContextOptions<DatabaseContext> opts = new DbContextOptionsBuilder<DatabaseContext>()
+        .UseInMemoryDatabase("VisaApiDB")
+        .ConfigureWarnings(b => b.Ignore(InMemoryEventId.TransactionIgnoredWarning))
+        .Options;
+
+    public static DatabaseContext GetDbContext()
+    {
+            var result = new DatabaseContext(opts);
+
+            result.Database.EnsureDeleted();
+            result.Database.EnsureCreated();
+
+            return result;
+        }
+}

VisaApiTests/Tests/Infrastructure/Database/Repositories/ApplicantsRepositoryTests.cs

@@ -0,0 +1,154 @@
+using ApplicationLayer.InfrastructureServicesInterfaces;
+using ApplicationLayer.Services.Applicants.NeededServices;
+using FluentAssertions;
+using Infrastructure.Database;
+using Infrastructure.Database.Applicants.Repositories;
+using Infrastructure.Database.Applicants.Repositories.Exceptions;
+using VisaApi.Fakers.Applicants;
+using VisaApi.Fakers.Users;
+using VisaApi.Services;
+using Xunit;
+
+namespace VisaApi.Tests.Infrastructure.Database.Repositories;
+
+[Collection(Collections.ContextUsingTestCollection)]
+public class ApplicantsRepositoryTests
+{
+    private readonly static UserFaker userFaker = new();
+    private readonly static ApplicantFaker applicantFaker = new(GetDateTimeProvider());
+
+    /// <summary> Returns <see cref="IApplicantsRepository"/> </summary>
+    /// <param name="context"> Database context </param>
+    /// <returns>Repository</returns>
+    private static IApplicantsRepository GetRepository(DatabaseContext context)
+        => new ApplicantsRepository(context, context);
+
+    /// <summary> Returns <see cref="IDateTimeProvider"/> </summary>
+    private static IDateTimeProvider GetDateTimeProvider() => new TestDateTimeProvider();
+
+    /// <summary>
+    /// Test for <see cref="IApplicantsRepository.FindByUserIdAsync"/> method that should throw exception for not existing entity
+    /// </summary>
+    [Fact]
+    private async Task FindByUserIdForNotExistingShouldThrow()
+    {
+            await using var context = InMemoryContextProvider.GetDbContext();
+            var repository = GetRepository(context);
+            ApplicantNotFoundByUserIdException? result = null;
+
+            try
+            {
+                await repository.FindByUserIdAsync(Guid.NewGuid(), CancellationToken.None);
+            }
+            catch (Exception e)
+            {
+                result = e as ApplicantNotFoundByUserIdException;
+            }
+
+            result.Should().NotBeNull();
+        }
+
+    /// <summary>
+    /// Test for <see cref="IApplicantsRepository.FindByUserIdAsync"/> method that should return existing entity
+    /// </summary>
+    [Fact]
+    private async Task FindByUserIdForExistingShouldReturnApplicant()
+    {
+            await using var context = InMemoryContextProvider.GetDbContext();
+            var repository = GetRepository(context);
+            var user = userFaker.Generate();
+            var applicant = applicantFaker.Generate();
+            applicant.UserId = user.Id;
+            await context.AddAsync(user);
+            await repository.AddAsync(applicant, CancellationToken.None);
+            await context.SaveChangesAsync();
+
+            var result = await repository.FindByUserIdAsync(user.Id, CancellationToken.None);
+
+            result.Should().BeEquivalentTo(applicant);
+        }
+
+    /// <summary>
+    /// Test for <see cref="IApplicantsRepository.GetApplicantIdByUserId"/> method that should throw exception for not existing entity
+    /// </summary>
+    [Fact]
+    private async Task GetApplicantIdByUserIdForNotExistingShouldThrow()
+    {
+            await using var context = InMemoryContextProvider.GetDbContext();
+            var repository = GetRepository(context);
+            ApplicantNotFoundByUserIdException? result = null;
+
+            try
+            {
+                await repository.GetApplicantIdByUserId(Guid.NewGuid(), CancellationToken.None);
+            }
+            catch (Exception e)
+            {
+                result = e as ApplicantNotFoundByUserIdException;
+            }
+
+            result.Should().NotBeNull();
+        }
+
+    /// <summary>
+    /// Test for <see cref="IApplicantsRepository.GetApplicantIdByUserId"/> method that should return existing entity's identifier
+    /// </summary>
+    [Fact]
+    private async Task GetApplicantIdByUserIdForExistingShouldReturnApplicant()
+    {
+            await using var context = InMemoryContextProvider.GetDbContext();
+            var repository = GetRepository(context);
+            var user = userFaker.Generate();
+            var applicant = applicantFaker.Generate();
+            applicant.UserId = user.Id;
+            await context.AddAsync(user);
+            await repository.AddAsync(applicant, CancellationToken.None);
+            await context.SaveChangesAsync();
+
+            var result = await repository.GetApplicantIdByUserId(user.Id, CancellationToken.None);
+
+            result.Should().Be(applicant.Id);
+        }
+
+    /// <summary>
+    /// Test for <see cref="IApplicantsRepository.IsApplicantNonResidentByUserId"/> method that should throw exception for not existing entity
+    /// </summary>
+    [Fact]
+    private async Task IsApplicantNonResidentByUserIdForNotExistingShouldThrow()
+    {
+            await using var context = InMemoryContextProvider.GetDbContext();
+            var repository = GetRepository(context);
+            ApplicantNotFoundByUserIdException? result = null;
+
+            try
+            {
+                await repository.IsApplicantNonResidentByUserId(Guid.NewGuid(), CancellationToken.None);
+            }
+            catch (Exception e)
+            {
+                result = e as ApplicantNotFoundByUserIdException;
+            }
+
+            result.Should().NotBeNull();
+        }
+
+    /// <summary>
+    /// Test for <see cref="IApplicantsRepository.IsApplicantNonResidentByUserId"/> method that should return existing entity's IsNonResident property
+    /// </summary>
+    [Fact]
+    private async Task IsApplicantNonResidentByUserIdForExistingShouldReturnApplicant()
+    {
+            await using var context = InMemoryContextProvider.GetDbContext();
+            var repository = GetRepository(context);
+            var user = userFaker.Generate();
+            var applicant = new ApplicantFaker(GetDateTimeProvider()).Generate();
+            applicant.UserId = user.Id;
+            await context.AddAsync(user);
+            await repository.AddAsync(applicant, CancellationToken.None);
+            await context.SaveChangesAsync();
+
+            var result = await repository.IsApplicantNonResidentByUserId(user.Id, CancellationToken.None);
+
+            result.Should().Be(applicant.IsNonResident);
+        }
+}

VisaApiTests/Tests/Infrastructure/Database/Repositories/Generic/GenericRepositoryTests.cs

@@ -0,0 +1,90 @@
+using ApplicationLayer.GeneralExceptions;
+using Domains.Users;
+using FluentAssertions;
+using Infrastructure.Database;
+using Infrastructure.Database.Generic;
+using Xunit;
+
+namespace VisaApi.Tests.Infrastructure.Database.Repositories.Generic;
+
+[Collection(Collections.ContextUsingTestCollection)]
+public class GenericRepositoryTests
+{
+    /// <summary> Returns <see cref="GenericRepository{T}"/> </summary>
+    /// <param name="context"> Database context </param>
+    /// <returns>Repository</returns>
+    private static GenericRepository<User> GetRepository(DatabaseContext context) => new TestGenericRepository(context, context);
+
+    /// <summary> Test for <see cref="GenericRepository{T}.GetAllAsync"/> method that should return empty collection if nothing added </summary>
+    [Fact]
+    public void GetAllForEmptyShouldReturnEmpty()
+    {
+        using var context = InMemoryContextProvider.GetDbContext();
+        var repository = GetRepository(context);
+
+        var result = repository.GetAllAsync(CancellationToken.None).Result;
+
+        result.Should().BeEmpty();
+    }
+
+    /// <summary> Test for <see cref="GenericRepository{T}.GetAllAsync"/> method that should return collection with added entities </summary>
+    [Fact]
+    public void GetAllForNotEmptyShouldReturnEntities()
+    {
+        using var context = InMemoryContextProvider.GetDbContext();
+        var repository = GetRepository(context);
+        User[] users =
+        [
+            new() { Email = "nasrudin@mail.ru", Password = "12345", Role = Role.Admin },
+            new() { Email = "bruh@mail.ru", Password = "123", Role = Role.Applicant }
+        ];
+        foreach (var user in users)
+        {
+            repository.AddAsync(user, CancellationToken.None).Wait();
+        }
+
+        context.SaveChanges();
+
+        var result = repository.GetAllAsync(CancellationToken.None).Result;
+
+        result.Should().Contain(users).And.HaveSameCount(users);
+    }
+
+    /// <summary> Test for <see cref="GenericRepository{T}.GetByIdAsync"/> method that should return existing entity </summary>
+    [Fact]
+    public void GetByIdForExistingShouldReturnEntity()
+    {
+        using var context = InMemoryContextProvider.GetDbContext();
+        var repository = GetRepository(context);
+        var user = new User { Email = "nasrudin@mail.ru", Password = "12345", Role = Role.Admin };
+        repository.AddAsync(user, CancellationToken.None).Wait();
+
+        context.SaveChanges();
+
+        var result = repository.GetByIdAsync(user.Id, CancellationToken.None).Result;
+
+        result.Should().Be(user);
+    }
+
+    /// <summary> Test for <see cref="GenericRepository{T}.GetByIdAsync"/> method that should throw exception for not found entity </summary>
+    [Fact]
+    public void GetByIdForNotExistingShouldThrow()
+    {
+        using var context = InMemoryContextProvider.GetDbContext();
+        var repository = GetRepository(context);
+
+        context.SaveChanges();
+
+        EntityNotFoundByIdException<User>? result = null;
+        try
+        {
+            repository.GetByIdAsync(Guid.NewGuid(), CancellationToken.None).Wait();
+        }
+        catch (AggregateException e)
+        {
+            result = e.InnerException as EntityNotFoundByIdException<User>;
+        }
+
+        result.Should().NotBeNull();
+    }
+}

VisaApiTests/Tests/Infrastructure/Database/Repositories/Generic/TestGenericRepository.cs

@@ -0,0 +1,6 @@
+using Domains.Users;
+using Infrastructure.Database.Generic;
+
+namespace VisaApi.Tests.Infrastructure.Database.Repositories.Generic;
+
+public class TestGenericRepository(IGenericReader reader, IGenericWriter writer) : GenericRepository<User>(reader, writer);

VisaApiTests/Tests/Infrastructure/Database/Repositories/UsersRepositoryTests.cs

@@ -0,0 +1,91 @@
+using ApplicationLayer.Services.AuthServices.NeededServices;
+using ApplicationLayer.Services.VisaApplications.NeededServices;
+using Domains.Users;
+using FluentAssertions;
+using Infrastructure.Database;
+using Infrastructure.Database.Users.Repositories;
+using VisaApi.Fakers.Users;
+using Xunit;
+
+namespace VisaApi.Tests.Infrastructure.Database.Repositories;
+
+[Collection(Collections.ContextUsingTestCollection)]
+public class UsersRepositoryTests
+{
+    private readonly static UserFaker userFaker = new();
+
+    /// <summary> Returns <see cref="IVisaApplicationsRepository"/> </summary>
+    /// <param name="context"> Database context </param>
+    /// <returns>Repository</returns>
+    private static IUsersRepository GetRepository(DatabaseContext context)
+        => new UsersRepository(context, context);
+
+    /// <summary>
+    /// Test for <see cref="IUsersRepository.FindByEmailAsync"/> method that should return null for not existing email
+    /// </summary>
+    [Fact]
+    private async Task FindByEmailForNotExistingShouldReturnNull()
+    {
+            await using var context = InMemoryContextProvider.GetDbContext();
+            var repository = GetRepository(context);
+
+            var result = await repository.FindByEmailAsync("email@email.ru", CancellationToken.None);
+
+            result.Should().BeNull();
+        }
+
+    /// <summary>
+    /// Test for <see cref="IUsersRepository.FindByEmailAsync"/> method that should return entity for existing email
+    /// </summary>
+    [Fact]
+    private async Task FindByEmailForExistingShouldReturnEntity()
+    {
+            await using var context = InMemoryContextProvider.GetDbContext();
+            var repository = GetRepository(context);
+            var user = userFaker.Generate();
+            await repository.AddAsync(user, CancellationToken.None);
+            await context.SaveChangesAsync();
+
+            var result = await repository.FindByEmailAsync(user.Email, CancellationToken.None);
+
+            result.Should().Be(user);
+        }
+
+    /// <summary>
+    /// Test for <see cref="IUsersRepository.GetAllOfRoleAsync"/> method that should return empty from empty db
+    /// </summary>
+    [Fact]
+    private async Task GetAllOfRoleForEmptyShouldReturnEmpty()
+    {
+            await using var context = InMemoryContextProvider.GetDbContext();
+            var repository = GetRepository(context);
+
+            var result = await repository.GetAllOfRoleAsync(Role.ApprovingAuthority, CancellationToken.None);
+
+            result.Should().BeEmpty();
+        }
+
+    /// <summary>
+    /// Test for <see cref="IUsersRepository.GetAllOfRoleAsync"/> method that should return entities from not empty db
+    /// </summary>
+    [Fact]
+    private async Task GetAllOfRoleForNotEmptyShouldReturnEntities()
+    {
+            await using var context = InMemoryContextProvider.GetDbContext();
+            var repository = GetRepository(context);
+            var users = new List<User>();
+            for (var i = 0; i < 3; i++)
+            {
+                var user = userFaker.Generate();
+                user.Role = Role.ApprovingAuthority;
+                users.Add(user);
+                await repository.AddAsync(user, CancellationToken.None);
+            }
+
+            await context.SaveChangesAsync();
+
+            var result = await repository.GetAllOfRoleAsync(Role.ApprovingAuthority, CancellationToken.None);
+
+            result.Should().Contain(users).And.HaveSameCount(users);
+        }
+}

VisaApiTests/Tests/Infrastructure/Database/Repositories/VisaApplicationsRepositoryTests.cs

@@ -0,0 +1,265 @@
+using ApplicationLayer.InfrastructureServicesInterfaces;
+using ApplicationLayer.Services.VisaApplications.NeededServices;
+using Domains.VisaApplicationDomain;
+using FluentAssertions;
+using Infrastructure.Database;
+using Infrastructure.Database.VisaApplications.Repositories;
+using Infrastructure.Database.VisaApplications.Repositories.Exceptions;
+using VisaApi.Fakers.Applicants;
+using VisaApi.Fakers.Users;
+using VisaApi.Fakers.VisaApplications;
+using VisaApi.Services;
+using Xunit;
+
+namespace VisaApi.Tests.Infrastructure.Database.Repositories;
+
+[Collection(Collections.ContextUsingTestCollection)]
+public class VisaApplicationsRepositoryTests
+{
+    private readonly static UserFaker userFaker = new();
+    private readonly static ApplicantFaker applicantFaker = new(GetDateTimeProvider());
+    private readonly static VisaApplicationFaker applicationFaker = new(GetDateTimeProvider());
+
+    /// <summary> Returns <see cref="IVisaApplicationsRepository"/> </summary>
+    /// <param name="context"> Database context </param>
+    /// <returns>Repository</returns>
+    private static IVisaApplicationsRepository GetRepository(DatabaseContext context)
+        => new VisaApplicationsRepository(context, context);
+
+    /// <summary> Returns <see cref="IDateTimeProvider"/> </summary>
+    private static IDateTimeProvider GetDateTimeProvider() => new TestDateTimeProvider();
+
+    /// <summary>
+    /// Test for <see cref="IVisaApplicationsRepository.GetOfApplicantAsync"/> method that should return empty if no applications added
+    /// </summary>
+    [Fact]
+    private async Task GetOfApplicantForEmptyShouldReturnEmpty()
+    {
+            await using var context = InMemoryContextProvider.GetDbContext();
+            var repository = GetRepository(context);
+            var user = userFaker.Generate();
+            var applicant = applicantFaker.Generate();
+            applicant.UserId = user.Id;
+            await context.AddAsync(user);
+            await context.AddAsync(applicant);
+            await context.SaveChangesAsync();
+
+            var result = await repository.GetOfApplicantAsync(applicant.Id, CancellationToken.None);
+
+            result.Should().BeEmpty();
+        }
+
+    /// <summary>
+    /// Test for <see cref="IVisaApplicationsRepository.GetOfApplicantAsync"/> method that should return added entities
+    /// </summary>
+    [Fact]
+    private async Task GetOfApplicantForExistingShouldReturnEntities()
+    {
+            await using var context = InMemoryContextProvider.GetDbContext();
+            var repository = GetRepository(context);
+            var user = userFaker.Generate();
+            var applicant = applicantFaker.Generate();
+            applicant.UserId = user.Id;
+            await context.AddAsync(user);
+            await context.AddAsync(applicant);
+            var applications = new List<VisaApplication>();
+            for (var i = 0; i < 5; i++)
+            {
+                var application = applicationFaker.GenerateValid(applicant);
+                applications.Add(application);
+                await context.AddAsync(application);
+            }
+
+            await context.SaveChangesAsync();
+
+            var result = await repository.GetOfApplicantAsync(applicant.Id, CancellationToken.None);
+
+            result.Should().Contain(applications).And.HaveSameCount(applications);
+        }
+
+    /// <summary>
+    /// Test for <see cref="IVisaApplicationsRepository.GetByApplicantAndApplicationIdAsync"/> method that should throw exception for not existing entities
+    /// </summary>
+    [Fact]
+    private async Task GetApplicantIdByUserIdForNotExistingShouldThrow()
+    {
+            await using var context = InMemoryContextProvider.GetDbContext();
+            var repository = GetRepository(context);
+            ApplicationNotFoundByApplicantAndApplicationIdException? result = null;
+
+            await context.SaveChangesAsync();
+
+            try
+            {
+                await repository.GetByApplicantAndApplicationIdAsync(Guid.NewGuid(), Guid.NewGuid(), CancellationToken.None);
+            }
+            catch (Exception e)
+            {
+                result = e as ApplicationNotFoundByApplicantAndApplicationIdException;
+            }
+
+            result.Should().NotBeNull();
+        }
+
+    /// <summary>
+    /// Test for <see cref="IVisaApplicationsRepository.GetByApplicantAndApplicationIdAsync"/> method that should throw exception for not existing applicant
+    /// </summary>
+    [Fact]
+    private async Task GetApplicantIdByUserIdForNotExistingApplicantShouldThrow()
+    {
+            await using var context = InMemoryContextProvider.GetDbContext();
+            var repository = GetRepository(context);
+            var user = userFaker.Generate();
+            var applicant = applicantFaker.Generate();
+            applicant.UserId = user.Id;
+            var application = applicationFaker.GenerateValid(applicant);
+            await context.AddAsync(user);
+            await context.AddAsync(applicant);
+            await context.AddAsync(application);
+            ApplicationNotFoundByApplicantAndApplicationIdException? result = null;
+
+            await context.SaveChangesAsync();
+
+            try
+            {
+                await repository.GetByApplicantAndApplicationIdAsync(Guid.NewGuid(), application.Id, CancellationToken.None);
+            }
+            catch (Exception e)
+            {
+                result = e as ApplicationNotFoundByApplicantAndApplicationIdException;
+            }
+
+            result.Should().NotBeNull();
+        }
+
+    /// <summary>
+    /// Test for <see cref="IVisaApplicationsRepository.GetByApplicantAndApplicationIdAsync"/> method that should throw exception for not existing application
+    /// </summary>
+    [Fact]
+    private async Task GetApplicantIdByUserIdForNotExistingApplicationShouldThrow()
+    {
+            await using var context = InMemoryContextProvider.GetDbContext();
+            var repository = GetRepository(context);
+            var user = userFaker.Generate();
+            var applicant = applicantFaker.Generate();
+            applicant.UserId = user.Id;
+            await context.AddAsync(user);
+            await context.AddAsync(applicant);
+            ApplicationNotFoundByApplicantAndApplicationIdException? result = null;
+
+            await context.SaveChangesAsync();
+
+            try
+            {
+                await repository.GetByApplicantAndApplicationIdAsync(applicant.Id, Guid.NewGuid(), CancellationToken.None);
+            }
+            catch (Exception e)
+            {
+                result = e as ApplicationNotFoundByApplicantAndApplicationIdException;
+            }
+
+            result.Should().NotBeNull();
+        }
+
+    /// <summary>
+    /// Test for <see cref="IVisaApplicationsRepository.GetByApplicantAndApplicationIdAsync"/> method
+    /// that should throw exception for not accessible application
+    /// </summary>
+    [Fact]
+    private async Task GetApplicantIdByUserIdForNotAccessibleApplicationShouldThrow()
+    {
+            await using var context = InMemoryContextProvider.GetDbContext();
+            var repository = GetRepository(context);
+            var user = userFaker.Generate();
+            var applicant = applicantFaker.Generate();
+            applicant.UserId = user.Id;
+            var otherUser = userFaker.Generate();
+            var otherApplicant = applicantFaker.Generate();
+            otherApplicant.UserId = user.Id;
+            var notAccessibleApplication = applicationFaker.GenerateValid(otherApplicant);
+            await context.AddAsync(user);
+            await context.AddAsync(applicant);
+            await context.AddAsync(otherUser);
+            await context.AddAsync(otherApplicant);
+            await context.AddAsync(notAccessibleApplication);
+            ApplicationNotFoundByApplicantAndApplicationIdException? result = null;
+
+            await context.SaveChangesAsync();
+
+            try
+            {
+                await repository.GetByApplicantAndApplicationIdAsync(applicant.Id, notAccessibleApplication.Id, CancellationToken.None);
+            }
+            catch (Exception e)
+            {
+                result = e as ApplicationNotFoundByApplicantAndApplicationIdException;
+            }
+
+            result.Should().NotBeNull();
+        }
+
+    /// <summary>
+    /// Test for <see cref="IVisaApplicationsRepository.GetByApplicantAndApplicationIdAsync"/> method
+    /// that should return application for valid identifiers
+    /// </summary>
+    [Fact]
+    private async Task GetApplicantIdByUserIdForValidIdsShouldReturnApplication()
+    {
+            await using var context = InMemoryContextProvider.GetDbContext();
+            var repository = GetRepository(context);
+            var user = userFaker.Generate();
+            var applicant = applicantFaker.Generate();
+            applicant.UserId = user.Id;
+            var application = applicationFaker.GenerateValid(applicant);
+            await context.AddAsync(user);
+            await context.AddAsync(applicant);
+            await context.AddAsync(application);
+
+            await context.SaveChangesAsync();
+
+            var result = await repository.GetByApplicantAndApplicationIdAsync(applicant.Id, application.Id, CancellationToken.None);
+
+            result.Should().Be(application);
+        }
+
+    /// <summary>
+    /// Test for <see cref="IVisaApplicationsRepository.GetPendingApplicationsAsync"/> method that should return empty from empty db
+    /// </summary>
+    [Fact]
+    private async Task GetPendingApplicationsForEmptyShouldReturnEmpty()
+    {
+            await using var context = InMemoryContextProvider.GetDbContext();
+            var repository = GetRepository(context);
+
+            var result = await repository.GetPendingApplicationsAsync(CancellationToken.None);
+
+            result.Should().BeEmpty();
+        }
+
+    /// <summary>
+    /// Test for <see cref="IVisaApplicationsRepository.GetPendingApplicationsAsync"/> method that should return pending applications from not empty db
+    /// </summary>
+    [Fact]
+    private async Task GetPendingApplicationsForExistingShouldReturnExistingPending()
+    {
+            await using var context = InMemoryContextProvider.GetDbContext();
+            var repository = GetRepository(context);
+            var user = userFaker.Generate();
+            var applicant = applicantFaker.Generate();
+            applicant.UserId = user.Id;
+            var applicationPending = applicationFaker.GenerateValid(applicant);
+            applicationPending.Status = ApplicationStatus.Pending;
+            var applicationNotPending = applicationFaker.GenerateValid(applicant);
+            applicationNotPending.Status = ApplicationStatus.Approved;
+            await context.AddAsync(user);
+            await context.AddAsync(applicant);
+            await context.AddAsync(applicationPending);
+            await context.AddAsync(applicationNotPending);
+
+            await context.SaveChangesAsync();
+
+            var result = await repository.GetPendingApplicationsAsync(CancellationToken.None);
+
+            result.Should().Contain(applicationPending).And.HaveCount(1);
+        }
+}