Visual Studio 2012 has plenty of unit testing features. NServiceBus.Testing offers testing by sending messages through message handlers and sagas. This includes anything that a message handler and saga can do, including header manipulation and dependency injection. You can visit http://docs.particular.net/NServiceBus/unit-testing for some basic examples. For the source code of NServiceBus.Testing, visit https://github.com/Particular/NServiceBus/tree/develop/src/NServiceBus.Testing.

The very basics of starting unit testing is to create a unit test project in Visual Studio by adding a new unit test project to an existing solution. See http://msdn.microsoft.com/en-us/library/hh598957.aspx/ for details.

We will add NServiceBus.Testing from NuGet by visiting http://www.nuget.org/packages/NServiceBus.Testing/. We will initialize the tests using Test.Initialize(), which is calling NServiceBus.Testing, thus starting the tests with either Test.Handler<HandleName>() or...