pythongh-97032: avoid test_squeezer crash on macOS buildbots (pythongh-115508) (pythonGH-148141)

pythongh-97032: avoid test_squeezer crash on macOS buildbots (pythonGH-115508)

avoid test_squeezer crash on macOS buildbots
(cherry picked from commit b216d7b)

Co-authored-by: Neil Schemenauer <nas-github@arctrix.com>
Co-authored-by: Ned Deily <nad@python.org>

Author: 2 people

Lib/idlelib/idle_test/test_squeezer.py

@@ -170,6 +170,7 @@ def test_write_not_stdout(self):
 
     def test_write_stdout(self):
         """Test Squeezer's overriding of the EditorWindow's write() method."""
+        requires('gui')
         editwin = self.make_mock_editor_window()
 
         for text in ['', 'TEXT']: