Issue #27173: Add 'IDLE Modern Unix' to the built-in key sets.

Make the default key set depend on the platform.
Add tests for changes to the config module.

Lib/idlelib/idle_test/test_config.py

@@ -0,0 +1,98 @@
+'''Test idlelib.config.
+
+Much is tested by opening config dialog live or in test_configdialog.
+Coverage: 27%
+'''
+from sys import modules
+from test.support import captured_stderr
+from tkinter import Tk
+import unittest
+from idlelib import config
+
+# Tests should not depend on fortuitous user configurations.
+# They must not affect actual user .cfg files.
+# Replace user parsers with empty parsers that cannot be saved.
+
+idleConf = config.idleConf
+usercfg = idleConf.userCfg
+testcfg = {}
+usermain = testcfg['main'] = config.IdleUserConfParser('')  # filename
+userhigh = testcfg['highlight'] = config.IdleUserConfParser('')
+userkeys = testcfg['keys'] = config.IdleUserConfParser('')
+
+def setUpModule():
+    idleConf.userCfg = testcfg
+
+def tearDownModule():
+    idleConf.userCfg = testcfg
+
+
+class CurrentColorKeysTest(unittest.TestCase):
+    """Test correct scenarios for colorkeys and wrap functions.
+
+        The 5 correct patterns are possible results of config dialog.
+    """
+    colorkeys = idleConf.current_colors_and_keys
+
+    def test_old_default(self):
+        # name2 must be blank
+        usermain.read_string('''
+            [Theme]
+            default= 1
+            ''')
+        self.assertEqual(self.colorkeys('Theme'), 'IDLE Classic')
+        usermain['Theme']['name'] = 'IDLE New'
+        self.assertEqual(self.colorkeys('Theme'), 'IDLE New')
+        usermain['Theme']['name'] = 'non-default'  # error
+        self.assertEqual(self.colorkeys('Theme'), 'IDLE Classic')
+        usermain.remove_section('Theme')
+
+    def test_new_default(self):
+        # name2 overrides name
+        usermain.read_string('''
+            [Theme]
+            default= 1
+            name= IDLE New
+            name2= IDLE Dark
+            ''')
+        self.assertEqual(self.colorkeys('Theme'), 'IDLE Dark')
+        usermain['Theme']['name2'] = 'non-default'  # error
+        self.assertEqual(self.colorkeys('Theme'), 'IDLE Classic')
+        usermain.remove_section('Theme')
+
+    def test_user_override(self):
+        # name2 does not matter
+        usermain.read_string('''
+            [Theme]
+            default= 0
+            name= Custom Dark
+            ''')  # error until set userhigh
+        self.assertEqual(self.colorkeys('Theme'), 'IDLE Classic')
+        userhigh.read_string('[Custom Dark]\na=b')
+        self.assertEqual(self.colorkeys('Theme'), 'Custom Dark')
+        usermain['Theme']['name2'] = 'IDLE Dark'
+        self.assertEqual(self.colorkeys('Theme'), 'Custom Dark')
+        usermain.remove_section('Theme')
+        userhigh.remove_section('Custom Dark')
+
+
+class WarningTest(unittest.TestCase):
+
+    def test_warn(self):
+        Equal = self.assertEqual
+        config._warned = set()
+        with captured_stderr() as stderr:
+            config._warn('warning', 'key')
+        Equal(config._warned, {('warning','key')})
+        Equal(stderr.getvalue(), 'warning'+'\n')
+        with captured_stderr() as stderr:
+            config._warn('warning', 'key')
+        Equal(stderr.getvalue(), '')
+        with captured_stderr() as stderr:
+            config._warn('warn2', 'yek')
+        Equal(config._warned, {('warning','key'), ('warn2','yek')})
+        Equal(stderr.getvalue(), 'warn2'+'\n')
+
+
+if __name__ == '__main__':
+    unittest.main(verbosity=2)