[3.15] gh-155648: Fix IDLE tests that cannot fail (GH-156257) (#156315)

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>

Author: miss-islington

Lib/idlelib/idle_test/template.py

@@ -21,6 +21,7 @@ def tearDownClass(cls):
         cls.root.destroy()
         del cls.root
 
+    @unittest.skip('Dummy test')
     def test_init(self):
         self.assertTrue(True)
 

Lib/idlelib/idle_test/test_autocomplete.py

@@ -230,16 +230,14 @@ def test_fetch_completions(self):
         # For file completion, a large list containing all files in the path,
         # and a small list containing files that do not start with '.'.
         acp = self.autocomplete
-        small, large = acp.fetch_completions(
-                '', ac.ATTRS)
-        if hasattr(__main__, '__file__') and __main__.__file__ != ac.__file__:
-            self.assertNotIn('AutoComplete', small)  # See issue 36405.
 
-        # Test attributes
-        s, b = acp.fetch_completions('', ac.ATTRS)
-        self.assertLess(len(small), len(large))
-        self.assertTrue(all(filter(lambda x: x.startswith('_'), s)))
-        self.assertTrue(any(filter(lambda x: x.startswith('_'), b)))
+        # Test current module (what='') attributes.
+        small, large = acp.fetch_completions('', ac.ATTRS)
+        if hasattr(__main__, '__file__') and __main__.__file__ != ac.__file__:
+            self.assertNotIn('AutoComplete', small)  # See gh-80586.
+        self.assertLess(len(small), len(large))  # Not equal
+        self.assertFalse(any(a[:1] == '_' for a in small))
+        self.assertTrue(any(a[:1] == '_' for a in large))
 
         # Test smalll should respect to __all__.
         with patch.dict('__main__.__dict__', {'__all__': ['a', 'b']}):

Lib/idlelib/idle_test/test_configdialog.py

@@ -50,6 +50,7 @@ def tearDownModule():
     root = dialog = None
 
 
+@unittest.skip('Empty tests')
 class ConfigDialogTest(unittest.TestCase):
 
     def test_deactivate_current_config(self):

Lib/idlelib/idle_test/test_editor.py

@@ -211,6 +211,7 @@ def test_searcher(self):
                 self.assertEqual(actual_pair, expected_pair)
 
 
+@unittest.skip('Empty test')
 class RMenuTest(unittest.TestCase):
 
     @classmethod