bpo-33855: Minimally test all IDLE modules. (GH-7689)


Create a template for minimally testing a tkinter-using module by importing it and instantiating its class(es).  Add a test file for all non-startup IDLE modules.  Edit existing files and update coverage.  This is part 1 of 3, covering the 21 autocomplete to help modules and touching 33 idlelib files.
(cherry picked from commit ee5ef309c7e2daef1248730145408f700732c42e)

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>
diff --git a/Lib/idlelib/grep.py b/Lib/idlelib/grep.py
index c55c48c..8cc293c 100644
--- a/Lib/idlelib/grep.py
+++ b/Lib/idlelib/grep.py
@@ -193,8 +193,8 @@
     button.pack()
 
 if __name__ == "__main__":
-    import unittest
-    unittest.main('idlelib.idle_test.test_grep', verbosity=2, exit=False)
+    from unittest import main
+    main('idlelib.idle_test.test_grep', verbosity=2, exit=False)
 
     from idlelib.idle_test.htest import run
     run(_grep_dialog)