[issue18365] Idle: mock Text class and test thereof

[R. David Murray]

R. David Murray added the comment:

Yeah, DISPLAY is how unix finds the X11 display.  I don't remember how the tkguionly tests deal with that being missing, but since the tests are run "headless" there is indeed no DISPLAY for the tests to talk to.

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<http://bugs.python.org/issue18365>
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