Why is [AssemblyInitialize] and [AssemblyCleanup] being called twice in same test project assembly?

Question

I thought the whole purpose of these attributes was to run them only once per assembly. I have a simple class as follows:

[TestClass]
public class AssemblyIntegr         


        

Answer 1

From the MSDN Library article:

Important

This attribute should not be used on ASP.NET unit tests, that is, any test with [HostType("ASP.NET")] attribute. Because of the stateless nature of IIS and ASP.NET, a method decorated with this attribute might be called more than once per test run.

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There are few knobs you can tweak in test runner. I would just punt the problem with a counter:

private int InitCount;

[AssemblyInitialize]
public static void SetupIntegrationTests(TestContext context)
{
     if (InitCount++ == 0) {
         WindowsServiceService.Instance.StartService("Distributed Transaction Coordinator");
     }
}

[AssemblyCleanup]
public static void TeardownIntegrationTests()
{
      if (--InitCount == 0) {
          WindowsServiceService.Instance.StopService("Distributed Transaction Coordinator");
      }
}