public async Task Should_Show_Error_When_Some_Parameters_Is_Invalid() { UserCreateCommand userCreateCommand = new UserCreateCommand(1, Guid.NewGuid().ToString(), _faker.Person.FullName, _faker.Person.Email); userCreateCommand.AddError("Meu erro para testar o UnitTest"); ResponseCommand response = await _userCreateCommandHandler.Handle(userCreateCommand, CancellationToken.None).ConfigureAwait(true); Assert.True(!response.Success); Assert.True(((List <string>)response.Object).Count > 0); Assert.True(((List <string>)response.Object).Find(x => x == "Meu erro para testar o UnitTest") != null); }