• Todd Volkert's avatar
    Add basic support for golden image file testing (#17094) · e19db89a
    Todd Volkert authored
    * Add a `matchesGoldenFile()` async matcher that will match
      a finder's widget's rasterized image against a golden file.
    * Add support for pluggable image comparison backends
    * Add a default backend that does simplistic PNG byte
      comparison on locally stored golden files.
    * Add support for `flutter test --update-goldens`, which will
      treat the rasterized image bytes produced during the test
      as the new golden bytes and update the golden file accordingly
    
    Still TODO:
    
    * Add support for the `flutter_test_config.dart` test config hook
    * Utilize `flutter_test_config.dart` in `packages/flutter/test`
      to install a backend that retrieves golden files from a dedicated
      `flutter/goldens` repo
    
    https://github.com/flutter/flutter/issues/16859
    e19db89a
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