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/help.py b/Lib/idlelib/help.py
index fa6112a..21b5ea5 100644
--- a/Lib/idlelib/help.py
+++ b/Lib/idlelib/help.py
@@ -271,5 +271,8 @@
     HelpWindow(parent, filename, 'IDLE Help (%s)' % python_version())
 
 if __name__ == '__main__':
+    from unittest import main
+    main('idlelib.idle_test.test_help', verbosity=2, exit=False)
+
     from idlelib.idle_test.htest import run
     run(show_idlehelp)