test: add --shards option to mobile e2e tests#686
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Pull request overview
This PR introduces sharding support for Maestro mobile E2E runs by booting multiple simulators/emulators and splitting flow execution across them, aiming to reduce end-to-end test runtime.
Changes:
- Added a
--shards Noption to the Maestro test runner script and wired it to Maestro’s device sharding (--shard-split). - Updated iOS simulator and Android emulator setup scripts to boot multiple devices and output
DEVICE_IDSfor downstream orchestration. - Optimized installation for multi-device runs by reusing a single build artifact across shard devices.
Reviewed changes
Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.
| File | Description |
|---|---|
| .maestro/scripts/setup-ios-simulator.sh | Boot and configure multiple iOS simulators; emit DEVICE_ID/DEVICE_IDS. |
| .maestro/scripts/setup-android-emulator.sh | Boot and configure multiple Android emulators with per-shard AVDs/ports; emit DEVICE_ID/DEVICE_IDS. |
| .maestro/scripts/run-tests.sh | Add --shards flag, compute/clamp shard count, set up multiple devices, install app across shards, and run Maestro with --shard-split. |
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Summary
This PR adds a
--shardsflag to the Maestro test runner. The default value is1.To speed up test execution, you can split the test suite across multiple emulators. For example:
yarn test:e2e:android --shards 3yarn test:e2e:ios --shards 3This will distribute the Maestro tests across three emulators, reducing the overall execution time.
When I run tests for example on iOS with 3 shards it reduces the time from 14min to 5min.
Test Plan
yarn test:e2e:android --shards Nyarn test:e2e:ios --shards NWith different N value
yarn test:e2e:androidyarn test:e2e:iosTests should run on single emulator like before this PR
Screenshots / Videos
Screen.Recording.2026-07-08.at.12.23.41.mov
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