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bpo-33751: Fix test_file. (GH-7378)

testModeStrings and testTruncateOnWindows were depended on
a file leaked in other tests.

Also improve cleaning up after tests.
S
Serhiy Storchaka committed
c2745d2d05546d76f655ab450eb23d1af39e0b1c
Parent: ac1ee1b
Committed by GitHub <noreply@github.com> on 6/5/2018, 4:55:41 PM