[3.12] gh-71339: Use new assertion methods in test_idle (GH-129314) (#129315)

Revise 10 tests in 7 files, with 1 test split into 2.
(cherry picked from commit 1499f66c4c)
Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>

Lib/idlelib/idle_test/test_configdialog.py

@@ -5,6 +5,7 @@ Half the class creates dialog, half works with user customizations.
 from idlelib import configdialog
 from test.support import requires
 requires('gui')
+from test.support.testcase import ExtraAssertions
 import unittest
 from unittest import mock
 from idlelib.idle_test.mock_idle import Func
@@ -59,7 +60,7 @@ class ConfigDialogTest(unittest.TestCase):
         pass
 
 
-class ButtonTest(unittest.TestCase):
+class ButtonTest(unittest.TestCase, ExtraAssertions):
 
     def test_click_ok(self):
         d = dialog
@@ -98,8 +99,8 @@ class ButtonTest(unittest.TestCase):
             dialog.buttons['Help'].invoke()
             title, contents = view.kwds['title'], view.kwds['contents']
         self.assertEqual(title, 'Help for IDLE preferences')
-        self.assertTrue(contents.startswith('When you click') and
+        self.assertStartsWith(contents, 'When you click')
-                        contents.endswith('a different name.\n'))
+        self.assertEndsWith(contents,'a different name.\n')
 
 
 class FontPageTest(unittest.TestCase):

Lib/idlelib/idle_test/test_debugger.py

@@ -9,6 +9,7 @@ from textwrap import dedent
 from tkinter import Tk
 
 from test.support import requires
+from test.support.testcase import ExtraAssertions
 import unittest
 from unittest import mock
 from unittest.mock import Mock, patch
@@ -227,7 +228,7 @@ class DebuggerGuiTest(unittest.TestCase):
         self.idb.get_stack.assert_called_once_with(test_frame, None)
 
 
-class StackViewerTest(unittest.TestCase):
+class StackViewerTest(unittest.TestCase, ExtraAssertions):
 
     @classmethod
     def setUpClass(cls):
@@ -256,7 +257,7 @@ class StackViewerTest(unittest.TestCase):
         flist = None
         master_window = self.root
         sv = debugger.StackViewer(master_window, flist, gui)
-        self.assertTrue(hasattr(sv, 'stack'))
+        self.assertHasAttr(sv, 'stack')
 
     def test_load_stack(self):
         # Test the .load_stack() method against a fixed test stack.

Lib/idlelib/idle_test/test_grep.py

@@ -8,6 +8,7 @@ Currently only test grep_it, coverage 51%.
 from idlelib import grep
 import unittest
 from test.support import captured_stdout
+from test.support.testcase import ExtraAssertions
 from idlelib.idle_test.mock_tk import Var
 import os
 import re
@@ -115,7 +116,7 @@ class FindfilesTest(unittest.TestCase):
         self.assertIn(self.realpath, filelist)
 
 
-class Grep_itTest(unittest.TestCase):
+class Grep_itTest(unittest.TestCase, ExtraAssertions):
     # Test captured reports with 0 and some hits.
     # Should test file names, but Windows reports have mixed / and \ separators
     # from incomplete replacement, so 'later'.
@@ -143,7 +144,7 @@ class Grep_itTest(unittest.TestCase):
         self.assertIn(pat, lines[0])
         self.assertIn('py: 1:', lines[1])  # line number 1
         self.assertIn('2', lines[3])  # hits found 2
-        self.assertTrue(lines[4].startswith('(Hint:'))
+        self.assertStartsWith(lines[4], '(Hint:')
 
 
 class Default_commandTest(unittest.TestCase):

Lib/idlelib/idle_test/test_multicall.py

@@ -3,10 +3,11 @@
 from idlelib import multicall
 import unittest
 from test.support import requires
+from test.support.testcase import ExtraAssertions
 from tkinter import Tk, Text
 
 
-class MultiCallTest(unittest.TestCase):
+class MultiCallTest(unittest.TestCase, ExtraAssertions):
 
     @classmethod
     def setUpClass(cls):
@@ -27,7 +28,7 @@ class MultiCallTest(unittest.TestCase):
     def test_creator(self):
         mc = self.mc
         self.assertIs(multicall._multicall_dict[Text], mc)
-        self.assertTrue(issubclass(mc, Text))
+        self.assertIsSubclass(mc, Text)
         mc2 = multicall.MultiCallCreator(Text)
         self.assertIs(mc, mc2)
 

Lib/idlelib/idle_test/test_query.py

@@ -12,6 +12,7 @@ HelpSource htests.  These are run by running query.py.
 from idlelib import query
 import unittest
 from test.support import requires
+from test.support.testcase import ExtraAssertions
 from tkinter import Tk, END
 
 import sys
@@ -105,7 +106,7 @@ class SectionNameTest(unittest.TestCase):
         self.assertEqual(dialog.entry_error['text'], '')
 
 
-class ModuleNameTest(unittest.TestCase):
+class ModuleNameTest(unittest.TestCase, ExtraAssertions):
     "Test ModuleName subclass of Query."
 
     class Dummy_ModuleName:
@@ -134,10 +135,10 @@ class ModuleNameTest(unittest.TestCase):
 
     def test_good_module_name(self):
         dialog = self.Dummy_ModuleName('idlelib')
-        self.assertTrue(dialog.entry_ok().endswith('__init__.py'))
+        self.assertEndsWith(dialog.entry_ok(), '__init__.py')
         self.assertEqual(dialog.entry_error['text'], '')
         dialog = self.Dummy_ModuleName('idlelib.idle')
-        self.assertTrue(dialog.entry_ok().endswith('idle.py'))
+        self.assertEndsWith(dialog.entry_ok(), 'idle.py')
         self.assertEqual(dialog.entry_error['text'], '')
 
 
@@ -376,7 +377,7 @@ class SectionnameGuiTest(unittest.TestCase):
         root.destroy()
 
 
-class ModulenameGuiTest(unittest.TestCase):
+class ModulenameGuiTest(unittest.TestCase, ExtraAssertions):
 
     @classmethod
     def setUpClass(cls):
@@ -389,7 +390,7 @@ class ModulenameGuiTest(unittest.TestCase):
         self.assertEqual(dialog.text0, 'idlelib')
         self.assertEqual(dialog.entry.get(), 'idlelib')
         dialog.button_ok.invoke()
-        self.assertTrue(dialog.result.endswith('__init__.py'))
+        self.assertEndsWith(dialog.result, '__init__.py')
         root.destroy()
 
 

Lib/idlelib/idle_test/test_redirector.py

@@ -3,11 +3,12 @@
 from idlelib.redirector import WidgetRedirector
 import unittest
 from test.support import requires
+from test.support.testcase import ExtraAssertions
 from tkinter import Tk, Text, TclError
 from idlelib.idle_test.mock_idle import Func
 
 
-class InitCloseTest(unittest.TestCase):
+class InitCloseTest(unittest.TestCase, ExtraAssertions):
 
     @classmethod
     def setUpClass(cls):
@@ -34,7 +35,7 @@ class InitCloseTest(unittest.TestCase):
         redir.register('insert', Func)
         redir.close()
         self.assertEqual(redir._operations, {})
-        self.assertFalse(hasattr(self.text, 'widget'))
+        self.assertNotHasAttr(self.text, 'widget')
 
 
 class WidgetRedirectorTest(unittest.TestCase):

Lib/idlelib/idle_test/test_sidebar.py

@@ -5,8 +5,8 @@ import sys
 from itertools import chain
 import unittest
 import unittest.mock
-from test.support import requires, swap_attr
+from test.support import adjust_int_max_str_digits, requires, swap_attr
-from test import support
+from test.support.testcase import ExtraAssertions
 import tkinter as tk
 from idlelib.idle_test.tkinter_testing_utils import run_in_tk_mainloop
 
@@ -391,7 +391,7 @@ class LineNumbersTest(unittest.TestCase):
         assert_colors_are_equal(orig_colors)
 
 
-class ShellSidebarTest(unittest.TestCase):
+class ShellSidebarTest(unittest.TestCase, ExtraAssertions):
     root: tk.Tk = None
     shell: PyShell = None
 
@@ -613,7 +613,7 @@ class ShellSidebarTest(unittest.TestCase):
 
     @run_in_tk_mainloop()
     def test_very_long_wrapped_line(self):
-        with support.adjust_int_max_str_digits(11_111), \
+        with adjust_int_max_str_digits(11_111), \
                 swap_attr(self.shell, 'squeezer', None):
             self.do_input('x = ' + '1'*10_000 + '\n')
             yield
@@ -725,7 +725,7 @@ class ShellSidebarTest(unittest.TestCase):
 
         text.tag_add('sel', f'{first_line}.0', 'end-1c')
         selected_text = text.get('sel.first', 'sel.last')
-        self.assertTrue(selected_text.startswith('if True:\n'))
+        self.assertStartsWith(selected_text, 'if True:\n')
         self.assertIn('\n1\n', selected_text)
 
         text.event_generate('<<copy>>')
@@ -749,7 +749,7 @@ class ShellSidebarTest(unittest.TestCase):
 
         text.tag_add('sel', f'{first_line}.3', 'end-1c')
         selected_text = text.get('sel.first', 'sel.last')
-        self.assertTrue(selected_text.startswith('True:\n'))
+        self.assertStartsWith(selected_text, 'True:\n')
 
         selected_lines_text = text.get('sel.first linestart', 'sel.last')
         selected_lines = selected_lines_text.split('\n')