read if the parent test is not already running
   in the MTA.

<p><b>Note:</b> On test methods, you may also use the <b>MTAThreadAttribute</b>.
   Although the runtime only recognizes this attribute on the entrypoint of
   an executable assembly, many users have expected it to work on tests, so
   we treat it as a synonym.

<h4>Examples</h4>

<div class="code"><pre class="prettyprint">

// An MTA thread will be created and used to run
// all the tests in the assembly
[assembly:RequiresMTA]

...

// TestFixt