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      1 Writing new tests
      2 =================
      3 
      4 Precaution
      5 ----------
      6 
      7     New tests should always use only one Tk window at once, like all the
      8     current tests do. This means that you have to destroy the current window
      9     before creating another one, and clean up after the test. The motivation
     10     behind this is that some tests may depend on having its window focused
     11     while it is running to work properly, and it may be hard to force focus
     12     on your window across platforms (right now only test_traversal at
     13     test_ttk.test_widgets.NotebookTest depends on this).
     14 
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