[1.7.x] Fixed #23107 -- Made runserver output respect --no-color.

Backport of 67d7da5fb9 from master

tests/admin_scripts/tests.py

@@ -1385,6 +1385,7 @@ class CommandTypes(AdminScriptTestCase):
         out = StringIO()
 
         call_command('color_command', no_color=True, stdout=out)
+        self.assertEqual(os.environ.get('DJANGO_COLORS', ''), 'nocolor')
         self.assertEqual(out.getvalue(), 'BEGIN\n')
 
     def test_base_command(self):