JayGhb

public class CreateCustomerCommandValidatorUnitTests
{
    private CreateCustomerCommandValidator validator;

    public CreateCustomerCommandValidatorUnitTests()
    {
        validator = new CreateCustomerCommandValidator();
    }

    [Fact]

JayGhb

if (exception is ValidationException validationException)
{
    string[] validationErrorMessages = validationException.Errors.Select(x => x.ErrorMessage).ToArray();
    
    ValidationProblemDetails problemDetails = new ValidationProblemDetails
    {
        Instance = req.Path,
        Status = StatusCodes.Status400BadRequest,
        Title = "One or more validation errors occurred.",
        Detail = $"{string.Join('-', validationErrorMessages)}"

JayGhb

public class ValidatorBehavior<TRequest, TResponse> : IPipelineBehavior<TRequest, TResponse>
    where TRequest : IRequest<TResponse>
{
    private readonly IEnumerable<IValidator<TRequest>> _validators;

    public ValidatorBehavior(IEnumerable<IValidator<TRequest>> validators)
    {
        _validators = validators ?? throw new ArgumentNullException(nameof(validators));
    }