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1.7 KiB
1.7 KiB
Screenshot testing
Overview
- Screenshot tests are tests which record the content of a rendered screen and verify subsequent runs to check if the screen renders differently.
- ElementX uses Paparazzi to render, record and verify Composable. All Composable Preview will be use to make screenshot test, thanks to the usage of Showkase.
- The screenshot verification occurs on every pull request as part of the
tests.yml
workflow.
Setup
- Install Git LFS through your package manager of choice (
brew install git-lfs
|yay -S git-lfs
). - Install the Git LFS hooks into the project.
# with element-android as the current working directory
git lfs install --local
- If installed correctly,
git push
andgit pull
will now include LFS content.
Recording
./gradlew recordPaparazziDebug
- Paparazzi will generate images in
:tests:uitests/src/test/snapshots
, which will need to be committed to the repository using Git LFS.
Verifying
./gradlew verifyPaparazziDebug
- In the case of failure, Paparazzi will generate images in
:tests:uitests/out/failure
. The images will show the expected and actual screenshots along with a delta of the two images.
Contributing
- Creating Previewable Composable will automatically creates new screenshot tests.
- After creating the new test, record and commit the newly rendered screens.
./tools/git/validate_lfs.sh
can be run to ensure everything is working correctly with Git LFS, the CI also runs this check.