Started validation tests

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

@@ -0,0 +1,37 @@
+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 return validation error for empty auth data
+        /// </summary>
+        [Fact]
+        private async Task ValidateForEmptyAuthDataShouldReturnError()
+        {
+            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();
+        }
+    }
+}