Is there an existing issue for this?

• I have searched the existing issues
• I have read the guide to filing a bug

Use case

If you modify some default colors, there are no tests that fail.

For instance, replace the default color for the popup menu item button and run the tests

      iconSize: widget.iconSize ?? iconTheme.size,
      color: widget.color ?? const Color(0xffffff00),

flutter test test/material/popup_menu_test.dart
00:05 +58: All tests passed!

Proposal

Add missing default color tests