title: Command-line options to force googletest to run in single thread
body: <p>I have a suite of unit tests that is managed by googletest. These tests are run in multiple threads by default, even when I use <code>--gtest_filter=foo.test</code> so that it only runs a single test. This is causing ambiguity about the cause of a bug I'm trying to hammer out.</p>
  
  <p>How can multithreaded testing be turned off in googletest?</p>