Added runner tests and configured PR validation

Author: matthew-carroll

.github/workflows/pr_validation.yaml

@@ -0,0 +1,37 @@
+name: Analyze & Test
+on: [pull_request, workflow_dispatch]
+
+jobs:
+  analyze:
+    runs-on: ubuntu-latest
+    steps:
+      # Checkout the PR branch
+      - uses: actions/checkout@v3
+
+      # Setup Flutter environment
+      - uses: subosito/flutter-action@v2
+        with:
+          channel: "stable"
+
+      # Download all the packages that the app uses
+      - run: flutter pub get
+
+      # Enforce lint rules
+      - run: flutter analyze
+
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      # Checkout the PR branch
+      - uses: actions/checkout@v3
+
+      # Setup Flutter environment
+      - uses: subosito/flutter-action@v2
+        with:
+          channel: "stable"
+
+      # Download all the packages that the app uses
+      - run: flutter pub get
+
+      # Run all tests
+      - run: flutter test

lib/src/platform_runners.dart

@@ -96,6 +96,7 @@ void testWidgetsOnMac(
       await test(tester);
     } finally {
       debugDefaultTargetPlatformOverride = null;
+      tester.view.reset();
     }
   }, skip: skip, variant: variant);
 }
@@ -144,6 +145,7 @@ void testWidgetsOnWindows(
       await test(tester);
     } finally {
       debugDefaultTargetPlatformOverride = null;
+      tester.view.reset();
     }
   }, skip: skip, variant: variant);
 }
@@ -192,6 +194,7 @@ void testWidgetsOnLinux(
       await test(tester);
     } finally {
       debugDefaultTargetPlatformOverride = null;
+      tester.view.reset();
     }
   }, skip: skip, variant: variant);
 }

test/test_runners_test.dart

@@ -0,0 +1,80 @@
+import 'package:flutter/foundation.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:flutter_test_runners/flutter_test_runners.dart';
+
+void main() {
+  group("Runners simulate platforms >", () {
+    group("all platforms >", () {
+      final expectedPlatforms = [
+        TargetPlatform.iOS,
+        TargetPlatform.android,
+        TargetPlatform.macOS,
+        TargetPlatform.windows,
+        TargetPlatform.linux,
+      ];
+
+      testWidgetsOnAllPlatforms("all platforms runner", (tester) async {
+        expect(expectedPlatforms, contains(defaultTargetPlatform));
+        expectedPlatforms.remove(defaultTargetPlatform);
+      });
+    });
+
+    group("mobile >", () {
+      final expectedPlatforms = [TargetPlatform.iOS, TargetPlatform.android];
+
+      testWidgetsOnMobile("mobile runner", (tester) async {
+        expect(expectedPlatforms, contains(defaultTargetPlatform));
+        expectedPlatforms.remove(defaultTargetPlatform);
+      });
+    });
+
+    testWidgetsOnIos("iOS runner", (tester) async {
+      expect(defaultTargetPlatform, TargetPlatform.iOS);
+
+      // We leave mobile pixel ratios alone because the default Flutter value
+      // approximates real mobile pixel ratios.
+      expect(tester.view.devicePixelRatio, 3.0);
+    });
+
+    testWidgetsOnAndroid("Android runner", (tester) async {
+      expect(defaultTargetPlatform, TargetPlatform.android);
+
+      // We leave mobile pixel ratios alone because the default Flutter value
+      // approximates real mobile pixel ratios.
+      expect(tester.view.devicePixelRatio, 3.0);
+    });
+
+    group("desktop >", () {
+      final expectedPlatforms = [TargetPlatform.macOS, TargetPlatform.windows, TargetPlatform.linux];
+
+      testWidgetsOnDesktop("desktop runner", (tester) async {
+        expect(expectedPlatforms, contains(defaultTargetPlatform));
+        expectedPlatforms.remove(defaultTargetPlatform);
+
+        // We configure desktop for a 1:1 pixel density to match real desktops.
+        expect(tester.view.devicePixelRatio, 1.0);
+      });
+    });
+
+    testWidgetsOnMac("Mac runner", (tester) async {
+      expect(defaultTargetPlatform, TargetPlatform.macOS);
+
+      // We configure desktop for a 1:1 pixel density to match real desktops.
+      expect(tester.view.devicePixelRatio, 1.0);
+    });
+
+    testWidgetsOnWindows("Windows runner", (tester) async {
+      expect(defaultTargetPlatform, TargetPlatform.windows);
+
+      // We configure desktop for a 1:1 pixel density to match real desktops.
+      expect(tester.view.devicePixelRatio, 1.0);
+    });
+
+    testWidgetsOnLinux("Linux runner", (tester) async {
+      expect(defaultTargetPlatform, TargetPlatform.linux);
+
+      // We configure desktop for a 1:1 pixel density to match real desktops.
+      expect(tester.view.devicePixelRatio, 1.0);
+    });
+  });
+}