Add "excluding" optional parameter to TargetPlatformVariant to communicate cases where test should be ran everywhere but specific platforms (#106216)

added "excluding" optional parameter to targetPlatforms.all

Co-authored-by: Anthony Oleinik <oleina@google.com>

Author: antholeole

packages/flutter/test/material/flexible_space_bar_collapse_mode_test.dart

@@ -47,7 +47,7 @@ void main() {
 
     expect(topBeforeScroll.dy, equals(0.0));
     expect(topAfterScroll.dy, equals(0.0));
-  }, variant: TargetPlatformVariant(TargetPlatform.values.where((TargetPlatform value) => value != TargetPlatform.fuchsia).toSet()));
+  }, variant: TargetPlatformVariant.all(excluding: <TargetPlatform>{ TargetPlatform.fuchsia }));
 
   testWidgets('FlexibleSpaceBar collapse mode pin', (WidgetTester tester) async {
     await tester.pumpWidget(
@@ -85,7 +85,7 @@ void main() {
 
     expect(topBeforeScroll.dy, equals(0.0));
     expect(topAfterScroll.dy, equals(-100.0));
-  }, variant: TargetPlatformVariant(TargetPlatform.values.where((TargetPlatform value) => value != TargetPlatform.fuchsia).toSet()));
+  }, variant: TargetPlatformVariant.all(excluding: <TargetPlatform>{ TargetPlatform.fuchsia }));
 
   testWidgets('FlexibleSpaceBar collapse mode parallax', (WidgetTester tester) async {
     await tester.pumpWidget(
@@ -123,7 +123,7 @@ void main() {
     expect(topBeforeScroll.dy, equals(0.0));
     expect(topAfterScroll.dy, lessThan(10.0));
     expect(topAfterScroll.dy, greaterThan(-50.0));
-  }, variant: TargetPlatformVariant(TargetPlatform.values.where((TargetPlatform value) => value != TargetPlatform.fuchsia).toSet()));
+  }, variant: TargetPlatformVariant.all(excluding: <TargetPlatform>{ TargetPlatform.fuchsia }));
 }
 
 Future<void> slowDrag(WidgetTester tester, Key widget, Offset offset) async {

packages/flutter/test/widgets/editable_text_cursor_test.dart

@@ -234,7 +234,7 @@ void main() {
       await tester.pump(const Duration(milliseconds: 100));
       expect(tester.hasRunningAnimations, false);
     }
-  }, variant: TargetPlatformVariant(TargetPlatform.values.toSet()..remove(TargetPlatform.iOS)));
+  }, variant: TargetPlatformVariant.all(excluding: <TargetPlatform>{ TargetPlatform.iOS }));
 
   testWidgets('Cursor does not animate on Android', (WidgetTester tester) async {
     final Color defaultCursorColor = Color(ThemeData.fallback().colorScheme.primary.value);

packages/flutter/test/widgets/editable_text_shortcuts_test.dart

@@ -138,7 +138,7 @@ void main() {
 
   group('Common text editing shortcuts: ',
     () {
-      final TargetPlatformVariant allExceptApple = TargetPlatformVariant(TargetPlatform.values.toSet()..removeAll(<TargetPlatform>[TargetPlatform.macOS, TargetPlatform.iOS]));
+      final TargetPlatformVariant allExceptApple = TargetPlatformVariant.all(excluding: <TargetPlatform>{TargetPlatform.macOS, TargetPlatform.iOS});
 
       group('backspace', () {
         const LogicalKeyboardKey trigger = LogicalKeyboardKey.backspace;
@@ -1813,7 +1813,7 @@ void main() {
   }, skip: kIsWeb); // [intended] on web these keys are handled by the browser.
 
   group('Web does not accept', () {
-    final TargetPlatformVariant allExceptApple = TargetPlatformVariant(TargetPlatform.values.toSet()..removeAll(<TargetPlatform>[TargetPlatform.macOS, TargetPlatform.iOS]));
+    final TargetPlatformVariant allExceptApple = TargetPlatformVariant.all(excluding: <TargetPlatform>{ TargetPlatform.iOS, TargetPlatform.macOS });
     const TargetPlatformVariant appleOnly = TargetPlatformVariant(<TargetPlatform>{ TargetPlatform.macOS, TargetPlatform.iOS });
     group('macOS shortcuts', () {
 

packages/flutter_test/lib/src/widget_tester.dart

@@ -254,8 +254,11 @@ class TargetPlatformVariant extends TestVariant<TargetPlatform> {
   const TargetPlatformVariant(this.values);
 
   /// Creates a [TargetPlatformVariant] that tests all values from
-  /// the [TargetPlatform] enum.
-  TargetPlatformVariant.all() : values = TargetPlatform.values.toSet();
+  /// the [TargetPlatform] enum. If [excluding] is provided, will test all platforms
+  /// except those in [excluding].
+  TargetPlatformVariant.all({
+    Set<TargetPlatform> excluding = const <TargetPlatform>{},
+  }) : values = TargetPlatform.values.toSet()..removeAll(excluding);
 
   /// Creates a [TargetPlatformVariant] that includes platforms that are
   /// considered desktop platforms.

packages/flutter_test/test/widget_tester_test.dart

@@ -720,13 +720,29 @@ void main() {
       expect(defaultTargetPlatform, equals(TargetPlatform.iOS));
     }, variant: TargetPlatformVariant.only(TargetPlatform.iOS));
 
-    testWidgets('TargetPlatformVariant.all tests run all variants', (WidgetTester tester) async {
-      if (debugDefaultTargetPlatformOverride == null) {
-        expect(numberOfVariationsRun, equals(TargetPlatform.values.length));
-      } else {
-        numberOfVariationsRun += 1;
-      }
-    }, variant: TargetPlatformVariant.all());
+    group('all', () {
+      testWidgets('TargetPlatformVariant.all tests run all variants', (WidgetTester tester) async {
+        if (debugDefaultTargetPlatformOverride == null) {
+          expect(numberOfVariationsRun, equals(TargetPlatform.values.length));
+        } else {
+          numberOfVariationsRun += 1;
+        }
+      }, variant: TargetPlatformVariant.all());
+
+      const Set<TargetPlatform> excludePlatforms = <TargetPlatform>{ TargetPlatform.android, TargetPlatform.linux };
+      testWidgets('TargetPlatformVariant.all, excluding runs an all variants except those provided in excluding', (WidgetTester tester) async {
+        if (debugDefaultTargetPlatformOverride == null) {
+          expect(numberOfVariationsRun, equals(TargetPlatform.values.length - excludePlatforms.length));
+          expect(
+            excludePlatforms,
+            isNot(contains(debugDefaultTargetPlatformOverride)),
+            reason: 'this test should not run on any platform in excludePlatforms'
+          );
+        } else {
+          numberOfVariationsRun += 1;
+        }
+      }, variant: TargetPlatformVariant.all(excluding: excludePlatforms));
+    });
 
     testWidgets('TargetPlatformVariant.desktop + mobile contains all TargetPlatform values', (WidgetTester tester) async {
       final TargetPlatformVariant all = TargetPlatformVariant.all();