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This PR adds a test that reproduces the problem described in the linked issue: hot restart on the web seems to not update if the app being run is `const`. The new test is expected to fail, until the `const` issue with hot restart in the web is resolved. Expected failure mode is a 15s timeout in the following test: ``` 02:31 +3 ~1 -1: Hot reload (index.html: Default) (with `const MyApp()`)): newly added code executes during hot restart [E] TimeoutException after 0:00:15.000000: Future not completed dart:async _startMicrotaskLoop ... ``` (And then a bunch of output that I'm not 100% sure is intended :)) ## Issues * #141588
Web integration tests
These tests are not hermetic, and use the actual Flutter SDK. While
they don't require actual devices, they run flutter_tester to test
Dart web debug services (dwds) and Flutter integration.
Use this command to run (from the flutter_tools directory):
../../bin/cache/dart-sdk/bin/dart run test test/web.shard
These tests are expensive to run and do not give meaningful coverage information for the flutter tool (since they are black-box tests that run the tool as a subprocess, rather than being unit tests). For this reason, they are in a separate shard when running on continuous integration and are not run when calculating coverage.