fix(flutter_tools): findBundleFile w/multiple flavor dimensions (#127133)

Fixes the `findBundleFile` method in `gradle.dart` to correctly locate app bundles generated from multiple flavor dimensions.

- closes flutter/flutter#92316
- closes flutter/flutter#65264

Author: felangel

packages/flutter_tools/lib/src/android/gradle.dart

@@ -983,6 +983,22 @@ File findBundleFile(FlutterProject project, BuildInfo buildInfo, Logger logger,
     fileCandidates.add(getBundleDirectory(project)
         .childDirectory('${buildInfo.uncapitalizedFlavor}${camelCase('_${buildInfo.modeName}')}')
         .childFile('app-${buildInfo.uncapitalizedFlavor}-${buildInfo.modeName}.aab'));
+
+    // The Android Gradle plugin uses kebab-case and lowercases the first character of the flavor name
+    // when multiple flavor dimensions are used:
+    // e.g.
+    // flavorDimensions "dimension1","dimension2"
+    // productFlavors {
+    //   foo {
+    //     dimension "dimension1"
+    //   }
+    //   bar {
+    //     dimension "dimension2"
+    //   }
+    // }
+    fileCandidates.add(getBundleDirectory(project)
+        .childDirectory('${buildInfo.uncapitalizedFlavor}${camelCase('_${buildInfo.modeName}')}')
+        .childFile('app-${kebabCase(buildInfo.uncapitalizedFlavor!)}-${buildInfo.modeName}.aab'));
   }
   for (final File bundleFile in fileCandidates) {
     if (bundleFile.existsSync()) {

packages/flutter_tools/lib/src/base/utils.dart

@@ -26,6 +26,11 @@ String camelCase(String str) {
   return str;
 }
 
+/// Convert `fooBar` to `foo-bar`.
+String kebabCase(String str) {
+  return snakeCase(str, '-');
+}
+
 final RegExp _upperRegex = RegExp(r'[A-Z]');
 
 /// Convert `fooBar` to `foo_bar`.

packages/flutter_tools/test/general.shard/android/gradle_find_bundle_test.dart

@@ -19,6 +19,19 @@ void main() {
     fileSystem = MemoryFileSystem.test();
   });
 
+  testWithoutContext('Finds app bundle when flavor contains multiple dimensions in release mode', () {
+    final FlutterProject project = generateFakeAppBundle('fooBarRelease', 'app-foo-bar-release.aab', fileSystem);
+    final File bundle = findBundleFile(
+      project,
+      const BuildInfo(BuildMode.release, 'fooBar', treeShakeIcons: false),
+      BufferLogger.test(),
+      TestUsage(),
+    );
+
+    expect(bundle, isNotNull);
+    expect(bundle.path, '/build/app/outputs/bundle/fooBarRelease/app-foo-bar-release.aab');
+  });
+
   testWithoutContext('Finds app bundle when flavor contains underscores in release mode', () {
     final FlutterProject project = generateFakeAppBundle('foo_barRelease', 'app.aab', fileSystem);
     final File bundle = findBundleFile(
@@ -84,6 +97,19 @@ void main() {
     expect(bundle.path, '/build/app/outputs/bundle/release/app.aab');
   });
 
+   testWithoutContext('Finds app bundle when flavor contains multiple dimensions in debug mode', () {
+    final FlutterProject project = generateFakeAppBundle('fooBarDebug', 'app-foo-bar-debug.aab', fileSystem);
+    final File bundle = findBundleFile(
+      project,
+      const BuildInfo(BuildMode.debug, 'fooBar', treeShakeIcons: false),
+      BufferLogger.test(),
+      TestUsage(),
+    );
+
+    expect(bundle, isNotNull);
+    expect(bundle.path, '/build/app/outputs/bundle/fooBarDebug/app-foo-bar-debug.aab');
+  });
+
   testWithoutContext('Finds app bundle when flavor contains underscores in debug mode', () {
     final FlutterProject project = generateFakeAppBundle('foo_barDebug', 'app.aab', fileSystem);
     final File bundle = findBundleFile(
@@ -149,6 +175,19 @@ void main() {
     expect(bundle.path, '/build/app/outputs/bundle/debug/app.aab');
   });
 
+  testWithoutContext('Finds app bundle when flavor contains multiple dimensions in profile mode', () {
+    final FlutterProject project = generateFakeAppBundle('fooBarProfile', 'app-foo-bar-profile.aab', fileSystem);
+    final File bundle = findBundleFile(
+      project,
+      const BuildInfo(BuildMode.profile, 'fooBar', treeShakeIcons: false),
+      BufferLogger.test(),
+      TestUsage(),
+    );
+
+    expect(bundle, isNotNull);
+    expect(bundle.path, '/build/app/outputs/bundle/fooBarProfile/app-foo-bar-profile.aab');
+  });
+
   testWithoutContext('Finds app bundle when flavor contains underscores in profile mode', () {
     final FlutterProject project = generateFakeAppBundle('foo_barProfile', 'app.aab', fileSystem);
     final File bundle = findBundleFile(

packages/flutter_tools/test/general.shard/utils_test.dart

@@ -120,6 +120,17 @@ baz=qux
       expect(snakeCase('ABC'), equals('a_b_c'));
     });
 
+    testWithoutContext('kebabCase', () async {
+      expect(kebabCase('abc'), equals('abc'));
+      expect(kebabCase('abC'), equals('ab-c'));
+      expect(kebabCase('aBc'), equals('a-bc'));
+      expect(kebabCase('aBC'), equals('a-b-c'));
+      expect(kebabCase('Abc'), equals('abc'));
+      expect(kebabCase('AbC'), equals('ab-c'));
+      expect(kebabCase('ABc'), equals('a-bc'));
+      expect(kebabCase('ABC'), equals('a-b-c'));
+    });
+
     testWithoutContext('sentenceCase', () async {
       expect(sentenceCase('abc'), equals('Abc'));
       expect(sentenceCase('ab_c'), equals('Ab_c'));