Add web safe indirection to Platform.isPlatform getters (#33406)

packages/flutter/test/animation/tween_test.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'dart:io';
-
 import 'package:flutter_test/flutter_test.dart';
 import 'package:flutter/animation.dart';
 import 'package:flutter/widgets.dart';
@@ -85,7 +83,7 @@ void main() {
       ),
       moreOrLessEquals(0.0),
     );
-  }, skip: Platform.isWindows); // floating point math not quite deterministic on Windows?
+  }, skip: isWindows); // floating point math not quite deterministic on Windows?
 
   test('ConstantTween', () {
     final ConstantTween<double> tween = ConstantTween<double>(100.0);

packages/flutter/test/cupertino/date_picker_test.dart

@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'dart:io' show Platform;
 import 'dart:ui';
 
 import 'package:flutter/cupertino.dart';
@@ -845,7 +844,7 @@ void main() {
       await expectLater(
         find.byType(CupertinoDatePicker),
         matchesGoldenFile('date_picker_test.datetime.initial.1.png'),
-        skip: !Platform.isLinux
+        skip: !isLinux
       );
 
       // Slightly drag the hour component to make the current hour off-center.
@@ -855,7 +854,7 @@ void main() {
       await expectLater(
         find.byType(CupertinoDatePicker),
         matchesGoldenFile('date_picker_test.datetime.drag.1.png'),
-        skip: !Platform.isLinux
+        skip: !isLinux
       );
     });
   });

packages/flutter/test/cupertino/nav_bar_test.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'dart:io';
-
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/rendering.dart';
 import 'package:flutter/services.dart';
@@ -806,7 +804,7 @@ void main() {
     },
     // TODO(xster): remove once https://github.com/flutter/flutter/issues/17483
     // is fixed.
-    skip: !Platform.isLinux,
+    skip: !isLinux,
   );
 
   testWidgets(
@@ -840,7 +838,7 @@ void main() {
     },
     // TODO(xster): remove once https://github.com/flutter/flutter/issues/17483
     // is fixed.
-    skip: !Platform.isLinux,
+    skip: !isLinux,
    );
 
 

packages/flutter/test/cupertino/segmented_control_test.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'dart:io';
-
 import 'package:flutter/widgets.dart';
 import 'package:flutter/cupertino.dart';
 import 'package:flutter_test/flutter_test.dart';
@@ -1329,7 +1327,7 @@ void main() {
       find.byType(RepaintBoundary),
       matchesGoldenFile('segmented_control_test.0.0.png'),
     );
-  }, skip: !Platform.isLinux);
+  }, skip: !isLinux);
 
   testWidgets('Golden Test Pressed State', (WidgetTester tester) async {
     final Map<int, Widget> children = <int, Widget>{};
@@ -1367,5 +1365,5 @@ void main() {
       find.byType(RepaintBoundary),
       matchesGoldenFile('segmented_control_test.1.0.png'),
     );
-  }, skip: !Platform.isLinux);
+  }, skip: !isLinux);
 }

packages/flutter/test/cupertino/text_field_test.dart

@@ -3,7 +3,6 @@
 // found in the LICENSE file.
 
 import 'dart:async';
-import 'dart:io';
 
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/rendering.dart';
@@ -376,7 +375,7 @@ void main() {
       find.byKey(const ValueKey<int>(1)),
       matchesGoldenFile('text_field_cursor_test.0.2.png'),
     );
-  }, skip: !Platform.isLinux);
+  }, skip: !isLinux);
 
   testWidgets('cursor iOS golden', (WidgetTester tester) async {
     debugDefaultTargetPlatformOverride = TargetPlatform.iOS;
@@ -406,7 +405,7 @@ void main() {
       find.byKey(const ValueKey<int>(1)),
       matchesGoldenFile('text_field_cursor_test.1.2.png'),
     );
-  }, skip: !Platform.isLinux);
+  }, skip: !isLinux);
 
   testWidgets(
     'can control text content via controller',

packages/flutter/test/material/bottom_app_bar_theme_test.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'dart:io' show Platform;
-
 import 'package:flutter/material.dart';
 import 'package:flutter/rendering.dart';
 import 'package:flutter_test/flutter_test.dart';
@@ -83,7 +81,7 @@ void main() {
     await expectLater(
       find.byKey(_painterKey),
       matchesGoldenFile('bottom_app_bar_theme.custom_shape.png'),
-      skip: !Platform.isLinux,
+      skip: !isLinux,
     );
   });
 

packages/flutter/test/material/bottom_navigation_bar_test.dart

@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'dart:io';
 import 'dart:ui';
 
 import 'package:flutter/material.dart';
@@ -1436,7 +1435,7 @@ void main() {
       await expectLater(
         find.byType(BottomNavigationBar),
         matchesGoldenFile('bottom_navigation_bar.shifting_transition.2.$pump.png'),
-        skip: !Platform.isLinux,
+        skip: !isLinux,
       );
     }
   });

packages/flutter/test/material/card_theme_test.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'dart:io' show Platform;
-
 import 'package:flutter/material.dart';
 import 'package:flutter/rendering.dart';
 import 'package:flutter_test/flutter_test.dart';
@@ -140,7 +138,7 @@ void main() {
     await expectLater(
       find.byKey(painterKey),
       matchesGoldenFile('card_theme.custom_shape.png'),
-      skip: !Platform.isLinux,
+      skip: !isLinux,
     );
   });
 }

packages/flutter/test/material/date_picker_test.dart

@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'dart:io';
 import 'dart:ui';
 
 import 'package:flutter/rendering.dart';
@@ -20,7 +19,7 @@ void main() {
   },
     // Skip on Windows because this test is quite flaky when run on Windows,
     // until https://github.com/flutter/flutter/issues/19696 is fixed.
-    skip: Platform.isWindows,
+    skip: isWindows,
   );
 }
 

packages/flutter/test/material/dialog_theme_test.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'dart:io' show Platform;
-
 import 'package:flutter/material.dart';
 import 'package:flutter/rendering.dart';
 import 'package:flutter_test/flutter_test.dart';
@@ -133,7 +131,7 @@ void main() {
     await expectLater(
       find.byKey(_painterKey),
       matchesGoldenFile('dialog_theme.dialog_with_custom_border.png'),
-      skip: !Platform.isLinux,
+      skip: !isLinux,
     );
   });
 

packages/flutter/test/material/dropdown_test.dart

@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'dart:io';
 import 'dart:math' as math;
 import 'dart:ui' show window;
 
@@ -142,7 +141,7 @@ void main() {
     await expectLater(
       find.ancestor(of: buttonFinder, matching: find.byType(RepaintBoundary)).first,
       matchesGoldenFile('dropdown_test.default.0.png'),
-      skip: !Platform.isLinux,
+      skip: !isLinux,
     );
   });
 
@@ -155,7 +154,7 @@ void main() {
     await expectLater(
       find.ancestor(of: buttonFinder, matching: find.byType(RepaintBoundary)).first,
       matchesGoldenFile('dropdown_test.expanded.0.png'),
-      skip: !Platform.isLinux,
+      skip: !isLinux,
     );
   });
 

packages/flutter/test/material/floating_action_button_test.dart

@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'dart:io';
 import 'dart:ui';
 
 import 'package:flutter/material.dart';
@@ -737,7 +736,7 @@ void main() {
     await expectLater(
       find.byKey(key),
       matchesGoldenFile('floating_action_button_test.clip.2.png'), // .clip.1.png is obsolete and can be removed
-      skip: !Platform.isLinux,
+      skip: !isLinux,
     );
   });
 

packages/flutter/test/material/input_decorator_test.dart

@@ -3,7 +3,6 @@
 // found in the LICENSE file.
 
 import 'dart:async';
-import 'dart:io' show Platform;
 
 import 'package:flutter/material.dart';
 import 'package:flutter/rendering.dart';
@@ -2031,17 +2030,17 @@ void main() {
       await expectLater(
         find.byType(InputDecorator),
         matchesGoldenFile('input_decorator.outline_icon_label.ltr.png'),
-        skip: !Platform.isLinux,
+        skip: !isLinux,
       );
 
       await tester.pumpWidget(buildFrame(TextDirection.rtl));
       await expectLater(
         find.byType(InputDecorator),
         matchesGoldenFile('input_decorator.outline_icon_label.rtl.png'),
-        skip: !Platform.isLinux,
+        skip: !isLinux,
       );
     },
-    skip: !Platform.isLinux,
+    skip: !isLinux,
   );
 
   testWidgets('InputDecorator draws and animates hoverColor', (WidgetTester tester) async {

packages/flutter/test/material/material_test.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'dart:io' show Platform;
-
 import 'package:flutter/material.dart';
 import 'package:flutter/painting.dart';
 import 'package:flutter/rendering.dart';
@@ -619,7 +617,7 @@ void main() {
       await expectLater(
         find.byKey(painterKey),
         matchesGoldenFile('material.border_paint_above.png'),
-        skip: !Platform.isLinux,
+        skip: !isLinux,
       );
     });
 
@@ -660,7 +658,7 @@ void main() {
       await expectLater(
         find.byKey(painterKey),
         matchesGoldenFile('material.border_paint_below.png'),
-        skip: !Platform.isLinux,
+        skip: !isLinux,
       );
     });
   });

packages/flutter/test/material/radio_test.dart

@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'dart:io' show Platform;
 import 'dart:ui';
 
 import 'package:flutter/rendering.dart';
@@ -278,7 +277,7 @@ void main() {
     await expectLater(
       find.byKey(painterKey),
       matchesGoldenFile('radio.ink_ripple.png'),
-      skip: !Platform.isLinux,
+      skip: !isLinux,
     );
   });
 }

packages/flutter/test/material/tab_bar_theme_test.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'dart:io' show Platform;
-
 import 'package:flutter/material.dart';
 import 'package:flutter/rendering.dart';
 import 'package:flutter_test/flutter_test.dart';
@@ -270,7 +268,7 @@ void main() {
     await expectLater(
       find.byKey(_painterKey),
       matchesGoldenFile('tab_bar_theme.tab_indicator_size_tab.png'),
-      skip: !Platform.isLinux,
+      skip: !isLinux,
     );
   });
 
@@ -282,7 +280,7 @@ void main() {
     await expectLater(
       find.byKey(_painterKey),
       matchesGoldenFile('tab_bar_theme.tab_indicator_size_label.png'),
-      skip: !Platform.isLinux,
+      skip: !isLinux,
     );
   });
 
@@ -299,7 +297,7 @@ void main() {
     await expectLater(
       find.byKey(_painterKey),
       matchesGoldenFile('tab_bar_theme.custom_tab_indicator.png'),
-      skip: !Platform.isLinux,
+      skip: !isLinux,
     );
   });
 
@@ -316,7 +314,7 @@ void main() {
     await expectLater(
       find.byKey(_painterKey),
       matchesGoldenFile('tab_bar_theme.beveled_rect_indicator.png'),
-      skip: !Platform.isLinux,
+      skip: !isLinux,
     );
   });
 }

packages/flutter/test/material/text_field_test.dart

@@ -3,7 +3,6 @@
 // found in the LICENSE file.
 
 import 'dart:async';
-import 'dart:io';
 import 'dart:math' as math;
 import 'dart:ui' as ui show window;
 
@@ -405,7 +404,7 @@ void main() {
       find.byKey(const ValueKey<int>(1)),
       matchesGoldenFile('text_field_cursor_test.0.0.png'),
     );
-  }, skip: !Platform.isLinux);
+  }, skip: !isLinux);
 
   testWidgets('cursor iOS golden', (WidgetTester tester) async {
     debugDefaultTargetPlatformOverride = TargetPlatform.iOS;
@@ -434,7 +433,7 @@ void main() {
       find.byKey(const ValueKey<int>(1)),
       matchesGoldenFile('text_field_cursor_test.1.0.png'),
     );
-  }, skip: !Platform.isLinux);
+  }, skip: !isLinux);
 
   testWidgets('text field selection toolbar renders correctly inside opacity', (WidgetTester tester) async {
     await tester.pumpWidget(
@@ -484,7 +483,7 @@ void main() {
       // The toolbar exists in the Overlay above the MaterialApp.
       find.byType(Overlay),
       matchesGoldenFile('text_field_opacity_test.0.2.png'),
-      skip: !Platform.isLinux,
+      skip: !isLinux,
     );
   });
 

packages/flutter/test/painting/continous_rectangle_border_test.dart

@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'dart:io' show Platform;
 import 'package:flutter/material.dart';
 import 'package:flutter/painting.dart';
 import 'package:flutter_test/flutter_test.dart';
@@ -73,7 +72,7 @@ void main() {
     await expectLater(
       find.byType(RepaintBoundary),
       matchesGoldenFile('continuous_rectangle_border.golden_test_even_radii.png'),
-      skip: !Platform.isLinux,
+      skip: !isLinux,
     );
   });
 
@@ -95,7 +94,7 @@ void main() {
     await expectLater(
       find.byType(RepaintBoundary),
       matchesGoldenFile('continuous_rectangle_border.golden_test_varying_radii.png'),
-      skip: !Platform.isLinux,
+      skip: !isLinux,
     );
   });
 
@@ -114,7 +113,7 @@ void main() {
     await expectLater(
       find.byType(RepaintBoundary),
       matchesGoldenFile('continuous_rectangle_border.golden_test_large_radii.png'),
-      skip: !Platform.isLinux,
+      skip: !isLinux,
     );
   });
 

packages/flutter/test/painting/text_painter_rtl_test.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'dart:io';
-
 import 'package:flutter/foundation.dart';
 import 'package:flutter/painting.dart';
 import 'package:flutter_test/flutter_test.dart';
@@ -321,7 +319,7 @@ void main() {
     );
   },
   // Ahem-based tests don't yet quite work on Windows or some MacOS environments
-  skip: Platform.isWindows || Platform.isMacOS);
+  skip: !isLinux);
 
   test('TextPainter - line wrap mid-word', () {
     final TextPainter painter = TextPainter()

packages/flutter/test/rendering/localized_fonts_test.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'dart:io' show Platform;
-
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 
@@ -54,7 +52,7 @@ void main() {
         matchesGoldenFile('localized_fonts.rich_text.styled_text_span.png'),
       );
     },
-    skip: !Platform.isLinux,
+    skip: !isLinux,
   );
 
   testWidgets(
@@ -106,7 +104,7 @@ void main() {
         matchesGoldenFile('localized_fonts.text_ambient_locale.chars.png'),
       );
     },
-    skip: !Platform.isLinux,
+    skip: !isLinux,
   );
 
   testWidgets(
@@ -150,7 +148,7 @@ void main() {
         matchesGoldenFile('localized_fonts.text_explicit_locale.chars.png'),
       );
     },
-    skip: !Platform.isLinux,
+    skip: !isLinux,
   );
 
 }

packages/flutter/test/rendering/paragraph_test.dart

@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'dart:io';
 import 'dart:ui' as ui show TextBox;
 
 import 'package:flutter/rendering.dart';
@@ -71,7 +70,7 @@ void main() {
     expect(boxes.any((ui.TextBox box) => box.right == 100 && box.top == 10), isTrue);
   },
   // Ahem-based tests don't yet quite work on Windows or some MacOS environments
-  skip: Platform.isWindows || Platform.isMacOS);
+  skip: isLinux);
 
   test('getWordBoundary control test', () {
     final RenderParagraph paragraph = RenderParagraph(
@@ -193,7 +192,7 @@ void main() {
 
     layoutAt(3);
     expect(paragraph.size.height, 30.0);
-  }, skip: Platform.isWindows); // Ahem-based tests don't yet quite work on Windows
+  }, skip: isWindows); // Ahem-based tests don't yet quite work on Windows
 
   test('changing color does not do layout', () {
     final RenderParagraph paragraph = RenderParagraph(

packages/flutter/test/widgets/backdrop_filter_test.dart

@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'dart:io';
 import 'dart:ui';
 
 import 'package:flutter/widgets.dart';
@@ -44,7 +43,7 @@ void main() {
     await expectLater(
       find.byType(RepaintBoundary).first,
       matchesGoldenFile('backdrop_filter_test.cull_rect.1.png'),
-      skip: !Platform.isLinux,
+      skip: !isLinux,
     );
   });
 }

packages/flutter/test/widgets/editable_text_cursor_test.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'dart:io';
-
 import 'package:flutter/foundation.dart';
 import 'package:flutter/rendering.dart';
 import 'package:flutter_test/flutter_test.dart';
@@ -94,7 +92,7 @@ void main() {
       find.byKey(const ValueKey<int>(1)),
       matchesGoldenFile('editable_text_test.0.3.png'),
     );
-  }, skip: !Platform.isLinux);
+  }, skip: !isLinux);
 
   testWidgets('cursor layout has correct radius', (WidgetTester tester) async {
     final GlobalKey<EditableTextState> editableTextKey = GlobalKey<EditableTextState>();
@@ -145,7 +143,7 @@ void main() {
       find.byKey(const ValueKey<int>(1)),
       matchesGoldenFile('editable_text_test.1.3.png'),
     );
-  }, skip: !Platform.isLinux);
+  }, skip: !isLinux);
 
   testWidgets('Cursor animates on iOS', (WidgetTester tester) async {
     final Widget widget = MaterialApp(
@@ -724,6 +722,6 @@ void main() {
       matchesGoldenFile('editable_text_test.2.0.png'),
     );
     debugDefaultTargetPlatformOverride = null;
-  }, skip: !Platform.isLinux);
+  }, skip: !isLinux);
 
 }

packages/flutter/test/widgets/invert_colors_test.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'dart:io';
-
 import 'package:flutter/rendering.dart';
 import 'package:flutter/widgets.dart';
 import 'package:flutter_test/flutter_test.dart';
@@ -23,7 +21,7 @@ void main() {
     await expectLater(
       find.byType(RepaintBoundary),
       matchesGoldenFile('invert_colors_test.0.png'),
-      skip: !Platform.isLinux,
+      skip: !isLinux,
     );
   });
 
@@ -42,7 +40,7 @@ void main() {
     await expectLater(
       find.byType(RepaintBoundary),
       matchesGoldenFile('invert_colors_test.1.png'),
-      skip: !Platform.isLinux,
+      skip: !isLinux,
     );
   });
 }

packages/flutter/test/widgets/list_wheel_scroll_view_test.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'dart:io';
-
 import 'package:flutter_test/flutter_test.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/rendering.dart';
@@ -538,7 +536,7 @@ void main() {
       await expectLater(
         find.byKey(const Key('list_wheel_scroll_view')),
         matchesGoldenFile('list_wheel_scroll_view.center_child.magnified.png'),
-        skip: !Platform.isLinux,
+        skip: !isLinux,
       );
     });
 
@@ -593,7 +591,7 @@ void main() {
       await expectLater(
         find.byKey(const Key('list_wheel_scroll_view')),
         matchesGoldenFile('list_wheel_scroll_view.curved_wheel.left.png'),
-        skip: !Platform.isLinux,
+        skip: !isLinux,
       );
     });
 

packages/flutter/test/widgets/opacity_test.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'dart:io';
-
 import 'package:flutter/widgets.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:flutter/material.dart';
@@ -180,7 +178,7 @@ void main() {
     await expectLater(
       find.byType(RepaintBoundary).first,
       matchesGoldenFile('opacity_test.offset.1.png'),
-      skip: !Platform.isLinux,
+      skip: !isLinux,
     );
   });
 

packages/flutter/test/widgets/physical_model_test.dart

@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'dart:io' show Platform;
 import 'dart:math' as math show pi;
 
 import 'package:flutter/material.dart';
@@ -112,7 +111,7 @@ void main() {
     await expectLater(
       find.byKey(key),
       matchesGoldenFile('physical_model_overflow.png'),
-      skip: !Platform.isLinux,
+      skip: !isLinux,
     );
   });
 

packages/flutter/test/widgets/shadow_test.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'dart:io' show Platform;
-
 import 'package:flutter_test/flutter_test.dart';
 import 'package:flutter/material.dart';
 
@@ -30,13 +28,11 @@ void main() {
     debugDisableShadows = false;
     tester.binding.reassembleApplication();
     await tester.pump();
-    if (Platform.isLinux) {
-      // TODO(ianh): use the skip argument instead once that doesn't hang, https://github.com/dart-lang/test/issues/830
-      await expectLater(
-        find.byType(Container),
-        matchesGoldenFile('shadow.BoxDecoration.enabled.png'),
-      ); // shadows render differently on different platforms
-    }
+    await expectLater(
+      find.byType(Container),
+      matchesGoldenFile('shadow.BoxDecoration.enabled.png'),
+      skip: !isLinux
+    ); // shadows render differently on different platforms
     debugDisableShadows = true;
   });
 
@@ -65,7 +61,7 @@ void main() {
       );
     }
     debugDisableShadows = true;
-  }, skip: !Platform.isLinux); // shadows render differently on different platforms
+  }, skip: !isLinux); // shadows render differently on different platforms
 
   testWidgets('Shadows with PhysicalLayer', (WidgetTester tester) async {
     await tester.pumpWidget(
@@ -93,13 +89,11 @@ void main() {
     debugDisableShadows = false;
     tester.binding.reassembleApplication();
     await tester.pump();
-    if (Platform.isLinux) {
-      // TODO(ianh): use the skip argument instead once that doesn't hang, https://github.com/dart-lang/test/issues/830
-      await expectLater(
-        find.byType(Container),
-        matchesGoldenFile('shadow.PhysicalModel.enabled.png'),
-      ); // shadows render differently on different platforms
-    }
+    await expectLater(
+      find.byType(Container),
+      matchesGoldenFile('shadow.PhysicalModel.enabled.png'),
+      skip: !isLinux,
+    ); // shadows render differently on different platforms
     debugDisableShadows = true;
   });
 
@@ -132,5 +126,5 @@ void main() {
       );
     }
     debugDisableShadows = true;
-  }, skip: !Platform.isLinux); // shadows render differently on different platforms
+  }, skip: !isLinux); // shadows render differently on different platforms
 }

packages/flutter/test/widgets/text_golden_test.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'dart:io' show Platform;
-
 import 'package:flutter_test/flutter_test.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/widgets.dart';
@@ -57,7 +55,7 @@ void main() {
       find.byType(Container),
       matchesGoldenFile('text_golden.Centered.wrap.png'),
     );
-  }, skip: !Platform.isLinux);
+  }, skip: !isLinux);
 
 
   testWidgets('Text Foreground', (WidgetTester tester) async {
@@ -133,7 +131,7 @@ void main() {
       find.byType(RepaintBoundary),
       matchesGoldenFile('text_golden.Foreground.stroke_and_gradient.png'),
     );
-  }, skip: !Platform.isLinux);
+  }, skip: !isLinux);
 
   // TODO(garyq): This test requires an update when the background
   // drawing from the beginning of the line bug is fixed. The current
@@ -183,7 +181,7 @@ void main() {
       find.byType(RepaintBoundary),
       matchesGoldenFile('text_golden.Background.png'),
     );
-  }, skip: !Platform.isLinux);
+  }, skip: !isLinux);
 
   testWidgets('Text Fade', (WidgetTester tester) async {
     await tester.pumpWidget(
@@ -219,7 +217,7 @@ void main() {
       find.byType(RepaintBoundary).first,
       matchesGoldenFile('text_golden.Fade.1.png'),
     );
-  }, skip: !Platform.isLinux);
+  }, skip: !isLinux);
 
   testWidgets('Default Strut text', (WidgetTester tester) async {
     await tester.pumpWidget(
@@ -480,7 +478,7 @@ void main() {
       find.byType(Container),
       matchesGoldenFile('text_golden.Decoration.1.0.png'),
     );
-  }, skip: !Platform.isLinux); // Coretext uses different thicknesses for decoration
+  }, skip: !isLinux); // Coretext uses different thicknesses for decoration
 
   testWidgets('Decoration thickness', (WidgetTester tester) async {
     final TextDecoration allDecorations = TextDecoration.combine(
@@ -519,5 +517,5 @@ void main() {
       find.byType(Container),
       matchesGoldenFile('text_golden.DecorationThickness.1.0.png'),
     );
-  }, skip: !Platform.isLinux); // Coretext uses different thicknesses for decoration
+  }, skip: !isLinux); // Coretext uses different thicknesses for decoration
 }

packages/flutter_test/lib/flutter_test.dart

@@ -54,6 +54,7 @@ export 'src/finders.dart';
 export 'src/goldens.dart';
 export 'src/matchers.dart';
 export 'src/nonconst.dart';
+export 'src/platform.dart';
 export 'src/stack_manipulation.dart';
 export 'src/test_async_utils.dart';
 export 'src/test_compat.dart';

packages/flutter_test/lib/src/platform.dart

+// Copyright 2019 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:io';
+
+// Whether the current dart code is running in an environment that was compiled
+// to JavaScript.
+const bool _kIsCompiledToJavaScript = identical(0, 0.0);
+
+/// Whether the test is running on the Windows operating system.
+///
+/// This does not include test compiled to JavaScript running in a browser on
+/// the Windows operating system.
+bool get isWindows {
+  if (_kIsCompiledToJavaScript) {
+    return false;
+  }
+  return Platform.isWindows;
+}
+
+/// Whether the test is running on the macOS operating system.
+///
+/// This does not include test compiled to JavaScript running in a browser on
+/// the macOS operating system.
+bool get isMacOS {
+  if (_kIsCompiledToJavaScript) {
+    return false;
+  }
+  return Platform.isMacOS;
+}
+
+/// Whether the test is running on the Linux operating system.
+///
+/// This does not include test compiled to JavaScript running in a browser on
+/// the Linux operating system.
+bool get isLinux {
+  if (_kIsCompiledToJavaScript) {
+    return false;
+  }
+  return Platform.isLinux;
+}
+
+/// Whether the test is running in a web browser compiled to JavaScript.
+bool get isBrowser {
+  return _kIsCompiledToJavaScript;
+}