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.

1 files changed, 21 insertions, 9 deletions

diff --git a/Lib/idlelib/idle_test/test_autoexpand.py b/Lib/idlelib/idle_test/test_autoexpand.py
index ae8186cdc4..e5f44c4687 100644
--- a/Lib/idlelib/idle_test/test_autoexpand.py
+++ b/Lib/idlelib/idle_test/test_autoexpand.py
@@ -1,9 +1,9 @@
-"""Unit tests for idlelib.autoexpand"""
+"Test autoexpand, coverage 100%."
+
+from idlelib.autoexpand import AutoExpand
 import unittest
 from test.support import requires
 from tkinter import Text, Tk
-#from idlelib.idle_test.mock_tk import Text
-from idlelib.autoexpand import AutoExpand
 
 
 class Dummy_Editwin:
@@ -15,15 +15,27 @@ class AutoExpandTest(unittest.TestCase):
 
     @classmethod
     def setUpClass(cls):
-        if 'tkinter' in str(Text):
-            requires('gui')
-            cls.tk = Tk()
-            cls.text = Text(cls.tk)
-        else:
-            cls.text = Text()
+        requires('gui')
+        cls.tk = Tk()
+        cls.text = Text(cls.tk)
         cls.auto_expand = AutoExpand(Dummy_Editwin(cls.text))
         cls.auto_expand.bell = lambda: None
 
+# If mock_tk.Text._decode understood indexes 'insert' with suffixed 'linestart',
+# 'wordstart', and 'lineend', used by autoexpand, we could use the following
+# to run these test on non-gui machines (but check bell).
+##        try:
+##            requires('gui')
+##            #raise ResourceDenied()  # Uncomment to test mock.
+##        except ResourceDenied:
+##            from idlelib.idle_test.mock_tk import Text
+##            cls.text = Text()
+##            cls.text.bell = lambda: None
+##        else:
+##            from tkinter import Tk, Text
+##            cls.tk = Tk()
+##            cls.text = Text(cls.tk)
+
     @classmethod
     def tearDownClass(cls):
         del cls.text, cls.auto_expand