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/debugger.py b/Lib/idlelib/debugger.py
index 114d0d1..477b514 100644
--- a/Lib/idlelib/debugger.py
+++ b/Lib/idlelib/debugger.py
@@ -12,7 +12,7 @@
 class Idb(bdb.Bdb):
 
     def __init__(self, gui):
-        self.gui = gui
+        self.gui = gui  # An instance of Debugger or proxy of remote.
         bdb.Bdb.__init__(self)
 
     def user_line(self, frame):
@@ -63,7 +63,7 @@
         if idb is None:
             idb = Idb(self)
         self.pyshell = pyshell
-        self.idb = idb
+        self.idb = idb  # If passed, a proxy of remote instance.
         self.frame = None
         self.make_gui()
         self.interacting = 0
@@ -542,3 +542,9 @@
 
     def close(self):
         self.frame.destroy()
+
+if __name__ == "__main__":
+    from unittest import main
+    main('idlelib.idle_test.test_debugger', verbosity=2, exit=False)
+
+# TODO: htest?