[issue18489] IDLE Unit test for SearchEngine.py

[Phil Webster]

Phil Webster added the comment:

Added tests for the rest of the SearchEngine module. I used the mock tkMessageBox for testing the error display, but used the tkinter Text widget for other tests because mark_set and tag_add/remove haven't been added to the mock yet.

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Added file: http://bugs.python.org/file31030/test_searchengine2.patch

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