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Performance tools for Flutter

Results 668 devtools issues
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- [x] P0 build and publish scripts need to be updated, and building from `dart bin/devtools.dart`is broken. Audit whole app startup from server flow. Related (https://github.com/flutter/devtools/issues/1468). Fixed by https://github.com/flutter/devtools/pull/1975 -...

release-blocker

We previously had integration tests for the html app. We disabled these tests but kept the files for reference during test re-write. We should write versions of these tests for...

testing
tech debt

memory_service_test currently uses memory_controller.dart and memory_protocol.dart from the html app files. The test needs to be rewritten to use the files from the flutter app.

testing
tech debt

While trying to fix up test failures on another branch, I noticed that some of them failed even without my changes and when running on Flutter dev: I don't know...

testing
tech debt

See https://github.com/flutter/flutter/issues/67553 for background on --platform=chrome going away.

testing
tech debt
P2

The following warning is coming over the stderr stream (see [here](https://github.com/flutter/devtools/blob/69f253114a06dc870ae588ed4cd52650ed1c2ab9/packages/devtools_app/test/integration_tests/integration.dart#L366)), and causing the integration tests to fail: ``` Warning: You are using these overridden dependencies: ! devtools_server 0.9.3+4 from...

testing
tech debt

They are currently disabled because they are slowing development. This is from the integration_dart2js bot. ``` 02:20 +12 -1: /home/runner/work/devtools/devtools/packages/devtools_app/test/integration_tests/server_test.dart: Server (VM Service) Server reuses DevTools instance if not connected...

testing
tech debt
test flake

This is greatly slowing down development as we have to run the bots several times per CL to try to get the flake to stop happening. We should chase this...

testing
test flake
hurts-developer-velocity

There was a recent break to the inspector goldens (fix [here](https://github.com/flutter/devtools/pull/2919)). I attempted to run the update_goldens.sh script to update the goldens. The script took an extremely long time to...

testing
inspector page
hurts-developer-velocity

example: ``` 03:27 +244 ~3: /home/runner/work/devtools/devtools/packages/devtools_app/test/memory_screen_test.dart: MemoryScreen Chart Select Hover Test ══╡ EXCEPTION CAUGHT BY FLUTTER TEST FRAMEWORK ╞════════════════════════════════════════════════════ The following assertion was thrown while running async test code: Golden...

testing