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Bell-using files patched (module and test)
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Bell-using files not patched (no test yet) 
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A second bonus is that the dummy bell function, instead of lambda: None, can be a mock used to test that bell() was called when it should be (or even not). This was already true for test_undo, except that the mock wrapped rather than replaced the real bell function. I opened spinoff #27733 to extend this idea.
To make this possible, I gave the class instances a self.bell function that was replaced by the test code afterwards. I am leaving this issue open to give the other bell-using classes a similar attribute in preparation for future tests.