public async Task when_processing_the_command()
{
FakeCommandTypeCollection = new Mock <ICommandTypeCollection>();
FakeServiceProvider = new Mock <IServiceProvider>();
Subject = new CommandProcessor(FakeCommandTypeCollection.Object, FakeServiceProvider.Object);
async Task should_invoke_the_correct_command_handler()
{
FakeCommand expectedCommand = null;
var fakeCommandHandler = new FakeCommandHandler(x => expectedCommand = x);
FakeServiceProvider.Setup(x => x.GetService(typeof(IEnumerable <ICommandHandler <FakeCommand> >))).Returns(new[] { fakeCommandHandler });
var command = new FakeCommand();
await Subject.ProcessAsync(command);
command.Should().Be(expectedCommand);
}
void should_throw_exception_if_the_command_handler_is_not_found()
{
var command = new Mock <ICommand>().Object;
Subject.Awaiting(x => x.ProcessAsync(command)).Should()
.Throw <CommandProcessorException>()
.WithMessage($"The command handler for '{command}' could not be found");
}
void should_throw_exception_if_multiple_command_handlers_are_found()
{
var handlerType = typeof(ICommandHandler <FakeMultiCommand1>);
var enumerableType = typeof(IEnumerable <ICommandHandler <FakeMultiCommand1> >);
FakeServiceProvider.Setup(x => x.GetService(enumerableType)).Returns(new[] { new Mock <ICommandHandler <FakeMultiCommand1> >().Object, new Mock <ICommandHandler <FakeMultiCommand1> >().Object });
var command = new FakeMultiCommand1();
Subject.Awaiting(x => x.ProcessAsync(command)).Should()
.Throw <CommandProcessorException>()
.WithMessage($"Multiple command handlers for '{handlerType}' was found");
}
}
public async Task when_processing_the_command()
{
FakeCommandTypeCollection = new Mock <ICommandTypeCollection>();
FakeServiceProvider = new Mock <IServiceProvider>();
Subject = new CommandProcessor(FakeCommandTypeCollection.Object, FakeServiceProvider.Object);
async Task should_invoke_the_correct_command_handler()
{
FakeCommand expectedCommand = null;
var fakeCommandHandler = new FakeCommandHandler(x => expectedCommand = x);
FakeServiceProvider.Setup(x => x.GetService(typeof(ICommandHandler <FakeCommand>))).Returns(fakeCommandHandler);
var command = new FakeCommand();
await Subject.ProcessAsync(command);
command.Should().Be(expectedCommand);
}
async Task should_create_the_command_from_a_string()
{
var expectedCommandType = typeof(FakeCommand);
var fakeCommandHandler = new Mock <ICommandHandler <FakeCommand> >();
FakeCommandTypeCollection.Setup(x => x.GetType(expectedCommandType.Name)).Returns(expectedCommandType);
FakeServiceProvider.Setup(x => x.GetService(typeof(ICommandHandler <FakeCommand>))).Returns(fakeCommandHandler.Object);
await Subject.ProcessAsync(expectedCommandType.Name, "{}");
fakeCommandHandler.Verify(x => x.HandleAsync(It.IsAny <FakeCommand>()));
}
void should_throw_exception_if_the_command_handler_is_not_found()
{
var command = new Mock <ICommand>().Object;
Subject.Awaiting(async x => await x.ProcessAsync(command)).Should()
.Throw <CommandProcessorException>()
.WithMessage($"The command handler for '{command}' could not be found");
}
void should_throw_exception_if_the_command_type_is_not_found()
{
var commandName = "NotFoundCommand";
var json = JObject.Parse("{}");
Subject.Awaiting(async x => await x.ProcessAsync(commandName, json)).Should()
.Throw <CommandProcessorException>()
.WithMessage("The command type 'NotFoundCommand' could not be found");
}
void should_throw_exception_if_the_json_is_invalid()
{
var commandName = "FakeCommand";
FakeCommandTypeCollection.Setup(x => x.GetType(commandName)).Returns(typeof(FakeCommand));
Subject.Awaiting(async x => await x.ProcessAsync(commandName, (JObject)null)).Should()
.Throw <CommandProcessorException>()
.WithMessage("The json could not be converted to an object");
}
}