anchor.diff:    });
   
     testWidgets('MediaQuery.copyWith copies specified values', (WidgetTester tester) async {
  +    // Random and unique double values are used to ensure that the correct
  +    // values are copied over exactly
  +    const Size customSize = Size(3.14, 2.72);
  +    const double customDevicePixelRatio = 1.41;
  +    const double customTextScaleFactor = 1.62;
  +    const EdgeInsets customPadding = EdgeInsets.all(9.10938);
  +    const EdgeInsets customViewPadding = EdgeInsets.all(11.24031);
  +    const EdgeInsets customViewInsets = EdgeInsets.all(1.67262);
  +    const EdgeInsets customSystemGestureInsets = EdgeInsets.all(1.5556);
  +    const double customPhysicalDepth = 120.0;
  +
       final MediaQueryData data = MediaQueryData.fromWindow(WidgetsBinding.instance.window);
       final MediaQueryData copied = data.copyWith(
  -      size: const Size(3.14, 2.72),
  -      devicePixelRatio: 1.41,
  -      textScaleFactor: 1.62,
  -      padding: const EdgeInsets.all(9.10938),
  -      viewPadding: const EdgeInsets.all(11.24031),
  -      viewInsets: const EdgeInsets.all(1.67262),
  -      systemGestureInsets: const EdgeInsets.all(1.5556),
  -      physicalDepth: 120.0,
  +      size: customSize,
  +      devicePixelRatio: customDevicePixelRatio,
  +      textScaleFactor: customTextScaleFactor,
  +      padding: customPadding,
  +      viewPadding: customViewPadding,
  +      viewInsets: customViewInsets,
  +      systemGestureInsets: customSystemGestureInsets,
  +      physicalDepth: customPhysicalDepth,
         alwaysUse24HourFormat: true,
         accessibleNavigation: true,
         invertColors: true,
  
positive.code:                 builder: (BuildContext context) {
                    unpadded = MediaQuery.of(context);
                    return Container();
                  }
                ),
              );
            },
          ),
        )
      );
  
      expect(unpadded.size, size);
  
negative.code:           expect(data, isNull);
            tested = true;
            return Container();
          },
        ),
      );
      expect(tested, isTrue);
    });
  