screenshot-tests
Use when writing or running Paparazzi screenshot tests in stripe-android — covers PaparazziRule setup, recording/verifying commands, and test structure
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ソースの指示 · 読み取り専用プレビュー- name
- screenshot-tests
- description
- Use when writing or running Paparazzi screenshot tests in stripe-android — covers PaparazziRule setup, recording/verifying commands, and test structure
# Screenshot Tests (Paparazzi)
We use [Paparazzi](https://github.com/cashapp/paparazzi) for screenshot testing via the `screenshot-testing` module.
## Recording Screenshots
Record (update) screenshots after UI changes:
```bash
./gradlew :<module>:recordPaparazziDebug
```
To record a specific test class only:
```bash
./gradlew :<module>:recordPaparazziDebug --tests "com.stripe.android.package.MyScreenshotTest"
```
Wildcard form also works:
```bash
./gradlew :<module>:recordPaparazziDebug --tests "*.MyScreenshotTest"
```
New or updated screenshots are written to `<module>/src/test/snapshots/images/` and added to the Git staging area.
## Verifying Screenshots
Verify screenshots match recorded baselines (used on CI):
```bash
./gradlew :<module>:verifyPaparazziDebug
```
Failure diffs are written to `<module>/out/failures` (git-ignored).
## Test Class Structure
```kotlin
internal class MyScreenshotTest {
@get:Rule
val paparazziRule = PaparazziRule(
SystemAppearance.entries, // Light/Dark
PaymentSheetAppearance.entries, // Default/Custom/Crazy appearances
FontSize.entries, // Default/Large font
boxModifier = Modifier.padding(horizontal = 16.dp),
)
@Test
fun testDefault() {
paparazziRule.snapshot {
MyComposable(/* ... */)
}
}
}
```
- `PaparazziRule` generates all permutations of the config options automatically.
- Each test produces one snapshot per permutation (e.g., 12 images for 2 themes x 3 appearances x 2 font sizes).
- Snapshots are named `<package>_<class>_<method>[<permutation>].png`.
## Available Config Options
| Option | Values | Import |
|--------|--------|--------|
| `SystemAppearance` | `LightTheme`, `DarkTheme` | `com.stripe.android.screenshottesting` |
| `FontSize` | `DefaultFont`, `LargeFont` | `com.stripe.android.screenshottesting` |
| `PaymentSheetAppearance` | `DefaultAppearance`, `CustomAppearance`, `CrazyAppearance` | `com.stripe.android.utils.screenshots` |
## Common Mistakes
- **Using `-Precord` or other flags** — Paparazzi uses a separate `recordPaparazziDebug` task, not a project property.
- **Running `testDebugUnitTest` to record** — this only _verifies_ against existing snapshots; use `recordPaparazziDebug` to update them.
- **Forgetting to commit updated snapshots** — recorded images go into `src/test/snapshots/images/` and must be committed.
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