Writing new tests
=================

Precaution
----------

   * New tests should always use only one Tk window at once, like all the
   current tests do. This means that you have to destroy the current window
   before creating another one, and clean up after the test. The motivation
   behind this is that some tests may depend on having its window focused while
   it is running to work properly, and it may be hard to force focus on your
   window across platforms (right now only test_traversal at
   test_widgets.NotebookTest depends on this).
