Try Showkase for consolidating all screenshot tests into a single class; also as a preview browser

[lydavid]

https://github.com/airbnb/Showkase

Notes

• previews must not be private
• cannot use @DefaultPreviews
  • we can still test dark/light using TestParameterInjector, but we won't be able to preview them in AS
  • we could if we decide to keep both @DefaultPreviews and @ShowkaseComposable
• should be able to generate screenshot tests for all our previews, so we don't have to define each internal preview as a separate test
  • some of our screenshot tests are fullscreen and others are not
• needs to be in its own module, which needs to implement all ui modules

Access all composables for screenshot testing:

val metadata = Showkase.getMetadata()
val components = metadata.componentList
val colors= metadata.colorList
val typography = metadata.typographyList

Some issues right now:

• with kapt, have to clean after removing/changing previews
• can't actually see the composables
• screenshot names will be very long

References

• https://github.com/airbnb/Showkase/blob/master/showkase-screenshot-testing-paparazzi-sample/src/test/java/com/airbnb/android/showkase/screenshot/testing/paparazzi/sample/PaparazziSampleScreenshotTest.kt
• https://github.com/vector-im/element-x-android/blob/2f6dde935ddf7a48d7423b65eb3219136e953e03/tests/uitests/src/test/kotlin/ui/S.kt
• https://github.com/android/nowinandroid/pull/101/files

[lydavid]

Also consider https://github.com/Kotlin/Storytale