How can I unit test a Windows Service?

Question

.NET Framework: 2.0 Preferred Language: C#

I am new to TDD (Test Driven Development).

First of all, is it even possible to unit test Windows Service?

Answer 1

Designing for test is a good strategy, as many of the answers point out by recommending that your OnStart and OnStop methods stay very thin by delegating to domain objects.

However, if your tests do need to execute the service methods for some reason, you can use code like this to call them from within a test method (calling OnStart in this example):

serviceInstance.GetType().InvokeMember("OnStart", BindingFlags.InvokeMethod | BindingFlags.NonPublic | BindingFlags.Instance, null, serviceInstance, new object[] {new string[] {}});