How does NUnit (and MSTest) handle tests that change static/shared variables?

Question

I have some code that uses the shared gateway pattern to implement an inversion of control container. I have several hundred NUnit unit tests that exercises the code that u

Answer 1

Update:

Visual Studio 2010 introduced the ability to run tests in parallel.

Here is a step by step article about how to enable this.

MsTest:
So according to David Williamson, from Microsoft Visual Studio Team System, on this post in the MSDN forums:

Tests absolutely do NOT run in parallel when run in VS or via mstest.exe. If they are run in a Load Test through VS then that is a different story. Basic execution, however, is always serial.

Also, tests run using MsTest are each run using a different thread in order to ensure that you have a clean slate for each test. There is no way to disable this behavior.

NUnit:
NUnit runs all tests on the same thread.