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I saw the review comment about adding lines.
I do not have 8.4 either, but I get the point: the startup version check does not not guard the unittests. After test.text_idle imports unittest and tkinter (as tk) (line 6), I will add
if tk.TkVersion < 8.5:
 raise unittest.SkipTest("IDLE requires tk 8.5 or later.")
I will add a 'private API' and version-required notice to idlelib.idle_test.__init__. I will add version required to the notice already in idlelib.__init__.
For similar reasons, the proposed interface module (#27162) would also need an explicit check. (Note added there.)