Use the VM service to proxy goldenComparator for integration testing
#160131
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…S) integration tests (#160215) Part of #160043, makes it easier to add #160131. This PR has no functional changes to any of the code, but does refactor both the code and tests: - Makes a number of always non-null but not migrated to non-null properties, well, not-null - Creates two concrete methods (`update` and `compare` versus a positional nullable boolean) - Uses type signatures instead of `String?` to explain the possible results of the methods - Renames the mysterious `shellPath` variable to `flutterTesterBinPath` - Expands and rewrites internally-facing doc comments - Moves `WebRenderer` environment variable setting to `flutter_web_platform.dart` - Makes the tests have less duplication, and check for update/compare cases After this PR, I can use it in the non-web branch of the Flutter tool without any hacks or TODOS :) /cc @eyebrowsoffire (trivial web refactoring), @camsim99 (changes being made to tool).
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Prospective implementation, as a proof of concept, for #160043.
This re-uses
TestGoldenComparator, which was written for Flutter Web (which, similar to Android and iOS, can't do golden-file comparisons on "device"), but this time would apply them to Android and iOS builds as well (though in this PR, no conditional logic is applied).What works:
flutter_toolsCLI) listens on the VM serviceWhat doesn't:
flutter_toolsCLI) doesn't get the event the client sentThe console output at the current commit looks like this:
I'm perhaps doing something wrong, so I'll get some help tomorrow.