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>

1 files changed, 9 insertions, 3 deletions

diff --git a/Lib/idlelib/idle_test/test_grep.py b/Lib/idlelib/idle_test/test_grep.py
index 6b54c13..ab0d786 100644
--- a/Lib/idlelib/idle_test/test_grep.py
+++ b/Lib/idlelib/idle_test/test_grep.py
@@ -3,14 +3,15 @@ Non-gui unit tests for grep.GrepDialog methods.
 dummy_command calls grep_it calls findfiles.
 An exception raised in one method will fail callers.
 Otherwise, tests are mostly independent.
-*** Currently only test grep_it.
+Currently only test grep_it, coverage 51%.
 """
+from idlelib.grep import GrepDialog
 import unittest
 from test.support import captured_stdout
 from idlelib.idle_test.mock_tk import Var
-from idlelib.grep import GrepDialog
 import re
 
+
 class Dummy_searchengine:
     '''GrepDialog.__init__ calls parent SearchDiabolBase which attaches the
     passed in SearchEngine instance as attribute 'engine'. Only a few of the
@@ -21,6 +22,7 @@ class Dummy_searchengine:
 
 searchengine = Dummy_searchengine()
 
+
 class Dummy_grep:
     # Methods tested
     #default_command = GrepDialog.default_command
@@ -34,6 +36,7 @@ class Dummy_grep:
 
 grep = Dummy_grep()
 
+
 class FindfilesTest(unittest.TestCase):
     # findfiles is really a function, not a method, could be iterator
     # test that filename return filename
@@ -41,6 +44,7 @@ class FindfilesTest(unittest.TestCase):
     # test that recursive flag adds idle_test .py files
     pass
 
+
 class Grep_itTest(unittest.TestCase):
     # Test captured reports with 0 and some hits.
     # Should test file names, but Windows reports have mixed / and \ separators
@@ -71,10 +75,12 @@ class Grep_itTest(unittest.TestCase):
         self.assertIn('2', lines[3])  # hits found 2
         self.assertTrue(lines[4].startswith('(Hint:'))
 
+
 class Default_commandTest(unittest.TestCase):
     # To write this, move outwin import to top of GrepDialog
     # so it can be replaced by captured_stdout in class setup/teardown.
     pass
 
+
 if __name__ == '__main__':
-    unittest.main(verbosity=2, exit=False)
+    unittest.main(verbosity=2)