Add end-to-end AGP 9 build fixture

.circleci/config.yml

@@ -324,26 +324,44 @@ jobs:
             ./gradlew app:assembleAndroidTest
             ./gradlew app:assembleDebug -Ptarget=`pwd`/../integration_test/app_test.dart
 
-  agp9-smoke-test:
-    description: "Smoke-test purchases_ui_flutter under AGP 9 (configuration-time only)"
+  agp9-end-to-end-test:
+    description: "Build agp9_test_app under Flutter 3.44+ + AGP 9 for both android.builtInKotlin values"
     docker:
       - image: ghcr.io/cirruslabs/flutter:stable
-    resource_class: medium
+    resource_class: large
     steps:
       - checkout
       - revenuecat/install-sdkman
       - run:
-          name: Install JDK 21 and Gradle 9.1 (required by AGP 9)
-          working_directory: .circleci/agp9-smoke
+          name: Install JDK 21 (required by AGP 9)
+          working_directory: e2e-tests/agp9_test_app
           command: sdk env install
       - run:
           name: Print versions
           command: |
+            flutter --version
             java -version
-            gradle --version
+      - flutter-get-dependencies:
+          project: e2e-tests/agp9_test_app
+      - run:
+          name: Build APK with android.builtInKotlin=false (Flutter migrator default)
+          working_directory: e2e-tests/agp9_test_app
+          command: flutter build apk --debug
       - run:
-          name: Run AGP 9 smoke test
-          command: bash .circleci/agp9-smoke/run.sh
+          name: Flip fixture to android.builtInKotlin=true
+          working_directory: e2e-tests/agp9_test_app
+          when: always
+          command: |
+            sed -i 's/^android\.builtInKotlin=false$/android.builtInKotlin=true/' android/gradle.properties
+            grep '^android\.' android/gradle.properties
+      - run:
+          name: Build APK with android.builtInKotlin=true
+          working_directory: e2e-tests/agp9_test_app
+          when: always
+          command: |
+            flutter clean
+            rm -rf android/.gradle android/build
+            flutter build apk --debug
 
   android-integration-test:
     description: "Run Android integration tests for flutter"
@@ -610,7 +628,7 @@ workflows:
       - ios-integration-test-spm
       - macos-integration-test-spm
       - android-integration-test-build
-      - agp9-smoke-test
+      - agp9-end-to-end-test
       - run-maestro-e2e-tests-ios:
           context:
             - e2e-tests

e2e-tests/agp9_test_app/.gitignore

@@ -0,0 +1,45 @@
+# Miscellaneous
+*.class
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.build/
+.buildlog/
+.history
+.svn/
+.swiftpm/
+migrate_working_dir/
+
+# IntelliJ related
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# The .vscode folder contains launch configuration and tasks you configure in
+# VS Code which you may wish to be included in version control, so this line
+# is commented out by default.
+#.vscode/
+
+# Flutter/Dart/Pub related
+**/doc/api/
+**/ios/Flutter/.last_build_id
+.dart_tool/
+.flutter-plugins-dependencies
+.pub-cache/
+.pub/
+/build/
+/coverage/
+
+# Symbolication related
+app.*.symbols
+
+# Obfuscation related
+app.*.map.json
+
+# Android Studio will place build artifacts here
+/android/app/debug
+/android/app/profile
+/android/app/release

e2e-tests/agp9_test_app/.metadata

@@ -0,0 +1,30 @@
+# This file tracks properties of this Flutter project.
+# Used by Flutter tool to assess capabilities and perform upgrades etc.
+#
+# This file should be version controlled and should not be manually edited.
+
+version:
+  revision: "559ffa3f75e7402d65a8def9c28389a9b2e6fe42"
+  channel: "[user-branch]"
+
+project_type: app
+
+# Tracks metadata for the flutter migrate command
+migration:
+  platforms:
+    - platform: root
+      create_revision: 559ffa3f75e7402d65a8def9c28389a9b2e6fe42
+      base_revision: 559ffa3f75e7402d65a8def9c28389a9b2e6fe42
+    - platform: android
+      create_revision: 559ffa3f75e7402d65a8def9c28389a9b2e6fe42
+      base_revision: 559ffa3f75e7402d65a8def9c28389a9b2e6fe42
+
+  # User provided section
+
+  # List of Local paths (relative to this file) that should be
+  # ignored by the migrate tool.
+  #
+  # Files that are not part of the templates will be ignored by default.
+  unmanaged_files:
+    - 'lib/main.dart'
+    - 'ios/Runner.xcodeproj/project.pbxproj'

e2e-tests/agp9_test_app/.sdkmanrc

@@ -0,0 +1,5 @@
+# JDK 21 is required by AGP 9. Consumed by `sdk env install` in the
+# agp9-end-to-end-test CircleCI job. The project root pins JDK 17, used by
+# every other job; only this fixture needs JDK 21. Gradle 9.1 is pulled in
+# via the Gradle wrapper (see android/gradle/wrapper/gradle-wrapper.properties).
+java=21.0.7-librca

e2e-tests/agp9_test_app/README.md

@@ -0,0 +1,44 @@
+# agp9_test_app
+
+A minimal Flutter fixture that builds against the local `purchases_flutter` and
+`purchases_ui_flutter` packages on **Flutter 3.44+ with AGP 9 and KGP 2.x**.
+
+This is a build-only fixture: it is never run on a device. The point is to
+exercise the AGP 9 branch of `purchases_ui_flutter/android/build.gradle`
+end-to-end through the Flutter Gradle plugin, which the configuration-only
+checks in unit tests cannot do.
+
+## Pins
+
+The Android template generated by `flutter create` on Flutter 3.44 pins:
+
+- AGP `9.0.1`
+- KGP `2.3.20`
+- Gradle `9.1.0` (via the wrapper)
+- `android.builtInKotlin=false`
+- `android.newDsl=false`
+
+These are the Flutter 3.44 defaults and are intentionally **not** customized
+here — the whole point of this fixture is to verify the plugin works under
+the out-of-the-box settings a Flutter 3.44 app would have.
+
+## Running locally
+
+Requires Flutter 3.44+ and JDK 21 on `PATH`:
+
+```bash
+cd e2e-tests/agp9_test_app
+flutter pub get
+flutter build apk --debug
+```
+
+To also exercise the AGP 9 default of `android.builtInKotlin=true` (without
+duplicating the fixture), flip the flag and rebuild:
+
+```bash
+sed -i '' 's/^android.builtInKotlin=false$/android.builtInKotlin=true/' android/gradle.properties
+flutter clean && rm -rf android/.gradle android/build
+flutter build apk --debug
+```
+
+(Drop the `''` after `-i` on Linux.)

e2e-tests/agp9_test_app/analysis_options.yaml

@@ -0,0 +1,28 @@
+# This file configures the analyzer, which statically analyzes Dart code to
+# check for errors, warnings, and lints.
+#
+# The issues identified by the analyzer are surfaced in the UI of Dart-enabled
+# IDEs (https://dart.dev/tools#ides-and-editors). The analyzer can also be
+# invoked from the command line by running `flutter analyze`.
+
+# The following line activates a set of recommended lints for Flutter apps,
+# packages, and plugins designed to encourage good coding practices.
+include: package:flutter_lints/flutter.yaml
+
+linter:
+  # The lint rules applied to this project can be customized in the
+  # section below to disable rules from the `package:flutter_lints/flutter.yaml`
+  # included above or to enable additional rules. A list of all available lints
+  # and their documentation is published at https://dart.dev/lints.
+  #
+  # Instead of disabling a lint rule for the entire project in the
+  # section below, it can also be suppressed for a single line of code
+  # or a specific dart file by using the `// ignore: name_of_lint` and
+  # `// ignore_for_file: name_of_lint` syntax on the line or in the file
+  # producing the lint.
+  rules:
+    # avoid_print: false  # Uncomment to disable the `avoid_print` rule
+    # prefer_single_quotes: true  # Uncomment to enable the `prefer_single_quotes` rule
+
+# Additional information about this file can be found at
+# https://dart.dev/guides/language/analysis-options

e2e-tests/agp9_test_app/android/.gitignore

@@ -0,0 +1,14 @@
+gradle-wrapper.jar
+/.gradle
+/captures/
+/gradlew
+/gradlew.bat
+/local.properties
+GeneratedPluginRegistrant.java
+.cxx/
+
+# Remember to never publicly share your keystore.
+# See https://flutter.dev/to/reference-keystore
+key.properties
+**/*.keystore
+**/*.jks