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

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+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();
+    }
+}