 teardown methods. NUnit 2.5 introduces parameterized and generic
	test fixtures - see below.</p>

<p>There are a few restrictions on a class that is used as a test fixture.
	<ul>
		<li>It must be a publicly exported type.</li>
		<li>It must not be abstract.</li>
		<li>A non-parameterized fixture must have a default constructor.
		<li>A parameterized fixture must have a constructor that matches
			the parameters provided.
	</ul>
</p>

<p>If any of these restrictions are violated, the class is not runnable
 