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Reid Baker 7762b4cf32
Bump warn and error versions of agp, kotlin and gradle versions in preparation for gradle 9 (#171776) 
- **Relands "Bump warn and error versions of agp, kotlin and gradle
versions in preparation for gradle 9 (#171399)"**
- **bump lockfile generator to use kotlin 2.1.0**
- **Update formatting of lockfile to pass ktlint** 

Updated lockfiles with
`JAVA_HOME=/opt/homebrew/opt/openjdk@17/libexec/openjdk.jdk/Contents/Home/
dart dev/tools/bin/generate_gradle_lockfiles.dart` after
dev/tools/bin/generate_gradle_lockfiles.dart to bump the versions of
kotlin.

Failing tests from first attempt
https://flutter-dashboard.appspot.com/#/build?hashFilter=84a5ce765d193a9c79ab4297f367d5ad7efc5dac&showMac=false&showWindows=false&showiOS=false&showLinux=false&showBringup=true&repo=flutter&branch=master

Verified example test that cause revert was passing by running the
following

- `../../bin/cache/dart-sdk/bin/dart bin/test_runner.dart test -t
run_debug_test_android.dart` from `dev/devicelab`
- `../../bin/cache/dart-sdk/bin/dart bin/test_runner.dart test -t
run_release_test` from `dev/devicelab`
- `SHARD=android_engine_vulkan_tests bin/cache/dart-sdk/bin/dart
dev/bots/test.dart` from root with an android emulator. Hard to actually
verify because the emulator is closed as part of the tests but no
failures were from failures to compile.
- `flutter test
test/general.shard/android/android_project_migration_test.dart` from
`packages/flutter_tools/`

## Pre-launch Checklist

- [x] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [x] I read the [Tree Hygiene] wiki page, which explains my
responsibilities.
- [x] I read and followed the [Flutter Style Guide], including [Features
we expect every widget to implement].
- [x] I signed the [CLA].
- [x] I listed at least one issue that this PR fixes in the description
above.
- [x] I updated/added relevant documentation (doc comments with `///`).
- [x] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [x] I followed the [breaking change policy] and added [Data Driven
Fixes] where supported.
- [x] All existing and new tests are passing.
2025-07-08 18:40:35 +00:00
..
android
Bump warn and error versions of agp, kotlin and gradle versions in preparation for gradle 9 (#171776)
2025-07-08 18:40:35 +00:00
lib
Bump Dart to 3.8 and reformat (#171703)
2025-07-07 17:58:32 +00:00
test_driver
…
tool
Bump Dart to 3.8 and reformat (#171703)
2025-07-07 17:58:32 +00:00
.metadata
…
pubspec.yaml
Bump Dart to 3.8 and reformat (#171703)
2025-07-07 17:58:32 +00:00
README.md
…

README.md

android_engine_test

This directory contains a sample app and tests that demonstrate how to use the (experimental) native Flutter Driver API to drive Flutter apps that run on Android devices or emulators, interact with and capture screenshots of the app, and compare the screenshots against golden images.

Caution

This test suite is a very end-to-end suite that is testing a combination of the graphics backend, the Android embedder, the Flutter framework, and Flutter tools, and only useful when the documentation and naming stays up to date and is clearly actionable.

Please take extra care when updating the test suite to also update the REAMDE.

How it runs on CI (LUCI)

See dev/bots/suite_runners/run_android_engine_tests.dart, but tl;dr:

# TIP: If golden-files do not exist locally, this command will fail locally.
SHARD=android_engine_vulkan_tests bin/cache/dart-sdk/bin/dart dev/bots/test.dart
SHARD=android_engine_opengles_tests bin/cache/dart-sdk/bin/dart dev/bots/test.dart

Running the apps and tests

Each lib/{prefix}_main.dart file is a standalone Flutter app that you can run on an Android device or emulator.

flutter_rendered_blue_rectangle

This app displays a full screen blue rectangle. It mostly serves as a test that Flutter can run at all on the target device, and that the Flutter (native) driver can take a screenshot and compare it to a golden image. If this app or test fails, it's likely none of the other apps or tests will work either.

# Run the app
$ flutter run lib/flutter_rendered_blue_rectangle_main.dart

# Run the test
$ flutter drive lib/flutter_rendered_blue_rectangle_main.dart

external_texture/surface_producer_smiley_face

This app displays a full screen rectangular deformed smiley face with a yellow background. It tests the SurfaceProducer API end-to-end, including historic regression cases around backgrounding the app, trimming memory, and resuming the app.

# Run the app
$ flutter run lib/external_texture/surface_producer_smiley_face_main.dart

# Run the test
$ flutter drive lib/external_texture/surface_producer_smiley_face_main.dart

external_texture/surface_texture_smiley_face

This app displays a full screen rectangular deformed smiley face with a yellow background. It tests the SurfaceTexture API end-to-end.

# Run the app
$ flutter run lib/external_texture/surface_texture_smiley_face_main.dart

# Run the test
$ flutter drive lib/external_texture/surface_texture_smiley_face_main.dart

platform_view/hybrid_composition_platform_view

This app displays a blue orange gradient, the app is backgrounded, and then resumed. It tests the Hybrid Composition implementation.

# Run the app
$ flutter run lib/platform_view/hybrid_composition_platform_view_main.dart

# Run the test
$ flutter drive lib/platform_view/hybrid_composition_platform_view_main.dart

platform_view/texture_layer_hybrid_composition_platform_view

This app displays a blue orange gradient, the app is backgrounded, and then resumed. It tests the Texture Layer Hybrid Composition implementation.

# Run the app
$ flutter run lib/platform_view/texture_layer_hybrid_composition_platform_view_main.dart

# Run the test
$ flutter drive lib/platform_view/texture_layer_hybrid_composition_platform_view_main.dart

platform_view/virtual_display_platform_view

This app displays a blue orange gradient, the app is backgrounded, and then resumed. It tests the Virtual Display implementation.

# Run the app
$ flutter run lib/platform_view/virtual_display_platform_view_main.dart

# Run the test
$ flutter drive lib/platform_view/virtual_display_platform_view_main.dart

platform_view_tap_color_change

This app displays a blue rectangle, using platform views, which upon being tapped (natively, not by Flutter), changes from blue to red.

# Run the app
$ flutter run lib/platform_view_tap_color_change_main.dart

# Run the test
$ flutter drive lib/platform_view_tap_color_change_main_test.dart

Deflaking

Use tool/deflake.dart <path/to/lib/main.dart> to, in 1-command:

  • Build an APK.
  • Establish a baseline set of golden-files locally.
  • Run N tests (by default, 10) in the same state, asserting the same output.

For example:

dart tool/deflake.dart lib/flutter_rendered_blue_rectangle_main.dart

For more options, see dart tool/deflake.dart --help.