Issue #24759: Add test for IDLE syntax colorizoer.

Lib/idlelib/idle_test/test_colorizer.py

+'''Test idlelib/colorizer.py
+
+Perform minimal sanity checks that module imports and some things run.
+
+Coverage 22%.
+'''
+from idlelib import colorizer  # always test import
+from test.support import requires
+from tkinter import Tk, Text
+import unittest
+
+
+class FunctionTest(unittest.TestCase):
+
+    def test_any(self):
+        self.assertTrue(colorizer.any('test', ('a', 'b')))
+
+    def test_make_pat(self):
+        self.assertTrue(colorizer.make_pat())
+
+
+class ColorConfigTest(unittest.TestCase):
+
+    @classmethod
+    def setUpClass(cls):
+        requires('gui')
+        cls.root = Tk()
+        cls.text = Text(cls.root)
+
+    @classmethod
+    def tearDownClass(cls):
+        del cls.text
+        cls.root.destroy()
+        del cls.root
+
+    def test_colorizer(self):
+        colorizer.color_config(self.text)
+
+class ColorDelegatorTest(unittest.TestCase):
+
+    @classmethod
+    def setUpClass(cls):
+        requires('gui')
+        cls.root = Tk()
+
+    @classmethod
+    def tearDownClass(cls):
+        cls.root.destroy()
+        del cls.root
+
+    def test_colorizer(self):
+        colorizer.ColorDelegator()
+
+
+if __name__ == '__main__':
+    unittest.main(verbosity=2)