public async Task Should_validate_command_and_save_new_textModule()
        {
            var command = new CreateTextModule
            {
                SiteId   = Guid.NewGuid(),
                ModuleId = Guid.NewGuid(),
                Id       = Guid.NewGuid(),
                Content  = "Content"
            };

            var textModuleRepositoryMock = new Mock <ITextModuleRepository>();

            textModuleRepositoryMock
            .Setup(x => x.CreateAsync(It.IsAny <TextModule>()))
            .Returns(Task.CompletedTask);

            var validatorMock = new Mock <IValidator <CreateTextModule> >();

            validatorMock.Setup(x => x.Validate(command)).Returns(new ValidationResult());

            var createTextModuleHandler = new CreateTextModuleHandler(textModuleRepositoryMock.Object, validatorMock.Object);
            await createTextModuleHandler.HandleAsync(command);

            validatorMock.Verify(x => x.Validate(command));
            textModuleRepositoryMock.Verify(x => x.CreateAsync(It.IsAny <TextModule>()));
        }
        public void Should_throw_validation_exception_when_validation_fails()
        {
            var command = new CreateTextModule
            {
                SiteId   = Guid.NewGuid(),
                ModuleId = Guid.NewGuid(),
                Id       = Guid.Empty,
                Content  = "Content"
            };

            var textModuleRepositoryMock = new Mock <ITextModuleRepository>();

            var validatorMock = new Mock <IValidator <CreateTextModule> >();

            validatorMock.Setup(x => x.Validate(command)).Returns(new ValidationResult(new List <ValidationFailure> {
                new ValidationFailure("Id", "Id Error")
            }));

            var createTextModuleHandler = new CreateTextModuleHandler(textModuleRepositoryMock.Object, validatorMock.Object);

            Assert.ThrowsAsync <Exception>(async() => await createTextModuleHandler.HandleAsync(command));
        }