[issue31480] IDLE: disable ZzDummy, revise tests to match

[Terry J. Reedy]

Terry J. Reedy added the comment:


New changeset d384a81f557dab0b142bfcc9850bc68df46496ef by Terry Jan Reedy in branch 'master':
bpo-31480: IDLE - fix tests to pass with zzdummy extension disabled. (#3590)
https://github.com/python/cpython/commit/d384a81f557dab0b142bfcc9850bc68df46496ef


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