IssueTracker

When some Compose code uses the Locale.getDefault() method, the screenshot generation process uses the default locale of the local host machine.
This behavior is acceptable when previewing in Android Studio but can be counter-intuitive in screenshot testing scenarios, since the locales configured on developers machines and on CI servers are often different.

As an example, consider the DatePicker widget from Material 3. Create a Preview for screenshot testing with this widget:

class MainScreen {
    @ExperimentalMaterial3Api
    @Preview(showBackground = true)
    @Composable
    fun GreetingPreview() {
        SampleTheme {
            val datePickerState = rememberDatePickerState(initialSelectedDateMillis = 1578096000000)
            DatePicker(state = datePickerState, modifier = Modifier.padding(16.dp))
        }
    }
}

Generate reference images using a specific locale:

LC_ALL="es_ES.UTF-8" ./gradlew app:updateScreenshotTest

The images will be generated using the Spanish locale. Validation of these screenshots on a host with a different locale will fail:

./gradlew --stop
LC_ALL="en_US.UTF-8" ./gradlew app:validateScreenshotTest --rerun-tasks

It would be more convenient if the default application locale was used, as is already done for Android resources.

Compose Preview Screenshot Testing plugin version: 0.0.1-alpha01

System information automatically generated when creating a bug report:

Build: AI-241.15989.150.2412.11822507, 202405092133
AS: Koala Feature Drop | 2024.1.2 Canary 1
AI-241.15989.150.2412.11822507, JRE 17.0.10+0-17.0.10b1087.21-11609105x64 JetBrains s.r.o., OS Linux(amd64) v6.5.0-35-generic, screens 3840.0x2160.0, 3840.0x2160.0
Android Gradle Plugin: 8.6.0-alpha01
Gradle: 8.7
Gradle JDK: JetBrains Runtime 17.0.10
NDK: from local.properties: (not specified), latest from SDK: 26.1.10909125
CMake: from local.properties: (not specified), latest from SDK: (not found), from PATH: 3.27.4