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

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+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();
+        }
+    }
+}