Вытащил солюшен на уровень выше, чтобы прощё было дотнетить

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

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+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();
+    }
+}