Terry J. Reedy added the comment:
As I said on one of the other issues, which I hope you read, we have the option
of gui tests when mocking becomes too complicated. So at least for now, put the
test that requires marks in a separate test case with requires('gui') in
setUPClass.
The problem with a full implementation of marks is that they change position
when text is inserted or deleted before their position. Also, some mark
functions are easier if they are stored in a dict, while one function and the
movement operations are easier if they are stored in a sorted list. A partial
implementation that allowed only 1 or 2 marks would be easier that a full
implementation allowing any number. Mock marks that do not move (and don't need
to because of no inserts or deletes between definition and use) would also be
easy. So I want to see how marks need to be used for testing before doing
anything.
Even when a mock is used, we can temporarily use the tk version to verify that
the mock is working right. I did that in the patch for #18279. See the
commented out code in
http://hg.python.org/cpython/rev/22ce68d98345.
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