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This PR implements the functionality described above and hides it behind the `--experimental-faster-testing` flag of `flutter test`. ### The following are some performance measurements from test runs conducted on GitHub Actions run 1 logs: https://github.com/derekxu16/flutter_test_ci/actions/runs/8008029772/attempts/1 run 2 logs: https://github.com/derekxu16/flutter_test_ci/actions/runs/8008029772/attempts/2 run 3 logs: https://github.com/derekxu16/flutter_test_ci/actions/runs/8008029772/attempts/3 **length of `flutter test --reporter=expanded test/animation test/foundation` step** run 1: 54s run 2: 52s run 3: 56s average: 54s **length of `flutter test --experimental-faster-testing --reporter=expanded test/animation test/foundation` step** run 1: 27s run 2: 27s run 3: 29s average: 27.67s (~48.77% shorter than 54s) **length of `flutter test --reporter=expanded test/animation test/foundation test/gestures test/painting test/physics test/rendering test/scheduler test/semantics test/services` step** run 1: 260s run 2: 270s run 3: 305s average: 278.33s **length of `flutter test --experimental-faster-testing --reporter=expanded test/animation test/foundation test/gestures test/painting test/physics test/rendering test/scheduler test/semantics test/services` step** from a clean build (right after deleting the build folder): run 1: 215s run 2: 227s run 3: 245s average: 229s (~17.72% shorter than 278.33s) Note that in reality, `test/material` was not passed to `flutter test` in the trials below. All of the test files under `test/material` except for `test/material/icons_test.dart` were listed out individually **length of `flutter test --reporter=expanded test/material` step** run 1: 408s run 2: 421s run 3: 451s average: 426.67s **length of `flutter test --experimental-faster-testing --reporter=expanded test/material` step** run 1: 382s run 2: 373s run 3: 400s average: 385s (~9.77% shorter than 426.67s) --------- Co-authored-by: Dan Field <dnfield@google.com> |
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