[MediaQueryData] adds assertions to MediaQueryData Constructor (#53003)

packages/flutter/lib/src/widgets/media_query.dart

@@ -102,7 +102,21 @@ class MediaQueryData {
     this.highContrast = false,
     this.disableAnimations = false,
     this.boldText = false,
-  });
+  }) : assert(size != null),
+       assert(devicePixelRatio != null),
+       assert(textScaleFactor != null),
+       assert(platformBrightness != null),
+       assert(padding != null),
+       assert(viewInsets != null),
+       assert(systemGestureInsets != null),
+       assert(viewPadding != null),
+       assert(physicalDepth != null),
+       assert(alwaysUse24HourFormat != null),
+       assert(accessibleNavigation != null),
+       assert(invertColors != null),
+       assert(highContrast != null),
+       assert(disableAnimations != null),
+       assert(boldText != null);
 
   /// Creates data for a media query based on the given window.
   ///

packages/flutter/test/widgets/media_query_test.dart

@@ -564,4 +564,170 @@ void main() {
     expect(outsideBoldTextOverride, false);
     expect(insideBoldTextOverride, true);
   });
+
+  test('size parameter in MediaQueryData cannot be null', () {
+    try {
+      MediaQueryData(size: null);
+    } on AssertionError catch (error) {
+      expect(error.toString(), contains('size != null'));
+      expect(error.toString(), contains('is not true'));
+      return;
+    }
+    fail('The assert was never called when it should have been');
+  });
+
+  test('devicePixelRatio parameter in MediaQueryData cannot be null', () {
+    try {
+      MediaQueryData(devicePixelRatio: null);
+    } on AssertionError catch (error) {
+      expect(error.toString(), contains('devicePixelRatio != null'));
+      expect(error.toString(), contains('is not true'));
+      return;
+    }
+    fail('The assert was never called when it should have been');
+  });
+
+  test('textScaleFactor parameter in MediaQueryData cannot be null', () {
+    try {
+      MediaQueryData(textScaleFactor: null);
+    } on AssertionError catch (error) {
+      expect(error.toString(), contains('textScaleFactor != null'));
+      expect(error.toString(), contains('is not true'));
+      return;
+    }
+    fail('The assert was never called when it should have been');
+  });
+
+  test('platformBrightness parameter in MediaQueryData cannot be null', () {
+    try {
+      MediaQueryData(platformBrightness: null);
+    } on AssertionError catch (error) {
+      expect(error.toString(), contains('platformBrightness != null'));
+      expect(error.toString(), contains('is not true'));
+      return;
+    }
+    fail('The assert was never called when it should have been');
+  });
+
+  test('padding parameter in MediaQueryData cannot be null', () {
+    try {
+      MediaQueryData(padding: null);
+    } on AssertionError catch (error) {
+      expect(error.toString(), contains('padding != null'));
+      expect(error.toString(), contains('is not true'));
+      return;
+    }
+    fail('The assert was never called when it should have been');
+  });
+
+  test('viewInsets parameter in MediaQueryData cannot be null', () {
+    try {
+      MediaQueryData(viewInsets: null);
+    } on AssertionError catch (error) {
+      expect(error.toString(), contains('viewInsets != null'));
+      expect(error.toString(), contains('is not true'));
+      return;
+    }
+    fail('The assert was never called when it should have been');
+  });
+
+  test('systemGestureInsets parameter in MediaQueryData cannot be null', () {
+    try {
+      MediaQueryData(systemGestureInsets: null);
+    } on AssertionError catch (error) {
+      expect(error.toString(), contains('systemGestureInsets != null'));
+      expect(error.toString(), contains('is not true'));
+      return;
+    }
+    fail('The assert was never called when it should have been');
+  });
+
+  test('viewPadding parameter in MediaQueryData cannot be null', () {
+    try {
+      MediaQueryData(viewPadding: null);
+    } on AssertionError catch (error) {
+      expect(error.toString(), contains('viewPadding != null'));
+      expect(error.toString(), contains('is not true'));
+      return;
+    }
+    fail('The assert was never called when it should have been');
+  });
+
+  test('physicalDepth parameter in MediaQueryData cannot be null', () {
+    try {
+      MediaQueryData(physicalDepth: null);
+    } on AssertionError catch (error) {
+      expect(error.toString(), contains('physicalDepth != null'));
+      expect(error.toString(), contains('is not true'));
+      return;
+    }
+    fail('The assert was never called when it should have been');
+  });
+
+  test('alwaysUse24HourFormat parameter in MediaQueryData cannot be null', () {
+    try {
+      MediaQueryData(alwaysUse24HourFormat: null);
+    } on AssertionError catch (error) {
+      expect(error.toString(), contains('alwaysUse24HourFormat != null'));
+      expect(error.toString(), contains('is not true'));
+      return;
+    }
+    fail('The assert was never called when it should have been');
+  });
+
+  test('accessibleNavigation parameter in MediaQueryData cannot be null', () {
+    try {
+      MediaQueryData(accessibleNavigation: null);
+    } on AssertionError catch (error) {
+      expect(error.toString(), contains('accessibleNavigation != null'));
+      expect(error.toString(), contains('is not true'));
+      return;
+    }
+    fail('The assert was never called when it should have been');
+  });
+
+  test('invertColors parameter in MediaQueryData cannot be null', () {
+    try {
+      MediaQueryData(invertColors: null);
+    } on AssertionError catch (error) {
+      expect(error.toString(), contains('invertColors != null'));
+      expect(error.toString(), contains('is not true'));
+      return;
+    }
+    fail('The assert was never called when it should have been');
+  });
+
+  test('highContrast parameter in MediaQueryData cannot be null', () {
+    try {
+      MediaQueryData(highContrast: null);
+    } on AssertionError catch (error) {
+      expect(error.toString(), contains('highContrast != null'));
+      expect(error.toString(), contains('is not true'));
+      return;
+    }
+    fail('The assert was never called when it should have been');
+  });
+
+  test('disableAnimations parameter in MediaQueryData cannot be null', () {
+    try {
+      MediaQueryData(disableAnimations: null);
+    } on AssertionError catch (error) {
+      expect(error.toString(), contains('disableAnimations != null'));
+      expect(error.toString(), contains('is not true'));
+      return;
+    }
+    fail('The assert was never called when it should have been');
+  });
+
+  test('boldText parameter in MediaQueryData cannot be null', () {
+    try {
+      MediaQueryData(boldText: null);
+    } on AssertionError catch (error) {
+      expect(error.toString(), contains('boldText != null'));
+      expect(error.toString(), contains('is not true'));
+      return;
+    }
+    fail('The assert was never called when it should have been');
+  });
+
 }