[issue35668] Improve test coverage for idlelib

[anthony shaw]

anthony shaw <anthony.p.shaw at gmail.com> added the comment:

I was looking at the debugger.py module as being a good place the start, writing test cases for the Idb, Debugger, StackViewer and NamespaceViewer by patching out the dependant components (bdb, Idb, etc.

I might start there, raise a PR against it and do a module at a time, then work my way up to some of the trickier, tkinter-based modules.

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<https://bugs.python.org/issue35668>
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