Fix test failures when run against TraitsUI 7.1.0 #446
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Fixes #425
This PR reimplemented a few trivial test utility functions to be used within Enable and Kiva such that tests no longer import from private modules of TraitsUI. See also #443 on to what extent enable/kiva should depend on Pyface/TraitsUI. Dependency is a worse enemy to repeating oneself. The test utilities are so simple that reimplementing them is a cheap cost to enable looser coupling among the packages.