Verifying FluentValidation in unit tests

Assuming a class with a custom validator, similar to the following:

public record FeedbackCreateRequest
{
    public string Url { get; set; } = null!;

    public FeedbackResponse Response { get; set; } // An enum consisting of 3 options

    public string? Context { get; set; }

    public class Validator : AbstractValidator<FeedbackCreateRequest>
    {
        public Validator()
        {
            RuleFor(request => request.Url)
                .NotEmpty();

            RuleFor(request => request.Response)
                .IsInEnum();

            RuleFor(request => request.Context)
                .MaximumLength(250);
        }
    }
}

You can easily verify the request object is being validated as you expect by instantiating the validator and calling ShouldHaveValidationErrorFor:

[Fact]
public async Task FeedbackCreateRequestValidator_InvalidFields_IncludesRelevantErrors()
{
    // Arrange
    var validator = new FeedbackCreateRequest.Validator();

    var request = new FeedbackCreateRequest
    {
        Response = (FeedbackResponse)5,
        Context = new string('a', 251),
    };

    // Act
    var result = await validator.TestValidateAsync(request);

    // Assert
    Assert.Equal(3, result.Errors.Count);
    result.ShouldHaveValidationErrorFor(feedback => feedback.Url);
    result.ShouldHaveValidationErrorFor(feedback => feedback.Response);
    result.ShouldHaveValidationErrorFor(feedback => feedback.Context);
}