DWDS error when running DevTools integration tests

[elliette]

DWDS error when running DevTools integration tests.

One of our integration tests recently failed in CI (run link) with the following error:

result {"result":"false","failureDetails":["{\"methodName\":\"end to end extensions flow\",\"details\":\"══╡ EXCEPTION CAUGHT BY FLUTTER TEST FRAMEWORK ╞═════════════════\\nThe following RPCError was thrown running a test:\\next.flutter.inspector.structuredErrors: (-32603) Unexpected DWDS\\nerror for callServiceExtension: WipError -32000 Promise was\\ncollected\\n\\nWhen the exception was thrown, this was the stack:\\ndart-sdk/lib/_internal/js_dev_runtime/patch/core_patch.dart 748:28                  get current\\npackages/vm_service/src/snapshot_graph.dart.js 1870:41                              new\\npackages/vm_service/src/snapshot_graph.dart.js 2530:23                              <fn>\\npackages/vm_service/src/snapshot_graph.dart.js 2538:76                              [_call]\\npackages/vm_service/src/snapshot_graph.dart.js 2476:27                              callServiceExtension\\npackages/devtools_app_shared/src/service/service_extension_manager.dart.js 1042:91  <fn>\\ndart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 622:19                 <fn>\\ndart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 647:23                 <fn>\\ndart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 541:3                  _asyncStartSync\\npackages/devtools_app_shared/src/service/service_extension_manager.dart.js 1049:40  call\\npackages/devtools_app_shared/src/service/service_extension_manager.dart.js 1084:62  <fn>\\ndart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 622:19                 <fn>\\ndart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 647:23                 <fn>\\ndart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 541:3                  _asyncStartSync\\npackages/devtools_app_shared/src/service/service_extension_manager.dart.js 1157:30  callExtension\\npackages/devtools_app_shared/src/service/service_extension_manager.dart.js 1186:51  <fn>\\ndart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 622:19                 <fn>\\ndart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 647:23                 <fn>\\ndart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 593:31                 <fn>\\ndart-sdk/lib/async/zone.dart 1538:47                                                _rootRunUnary\\ndart-sdk/lib/async/zone.dart 1429:19                                                runUnary\\ndart-sdk/lib/async/future_impl.dart 208:18                                          handleValue\\ndart-sdk/lib/async/future_impl.dart 932:44                                          handleValueCallback\\ndart-sdk/lib/async/future_impl.dart 961:13                                          _propagateToListeners\\ndart-sdk/lib/async/future_impl.dart 535:9                                           <fn>\\ndart-sdk/lib/async/zone.dart 1525:13                                                _rootRun\\ndart-sdk/lib/async/zone.dart 1422:19                                                run\\ndart-sdk/lib/async/zone.dart 1321:7                                                 runGuarded\\ndart-sdk/lib/async/zone.dart 1362:23                                                callback\\ndart-sdk/lib/async/schedule_microtask.dart 40:11                                    _microtaskLoop\\ndart-sdk/lib/async/schedule_microtask.dart 49:5                                     _startMicrotaskLoop\\ndart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 186:7                  <fn>\\n\\nThe test description was:\\n  end to end extensions flow\\n═════════════════════════════════════════════════════════════════\\n\"}"]}
Failure Details:
Failure in method: end to end extensions flow
══╡ EXCEPTION CAUGHT BY FLUTTER TEST FRAMEWORK ╞═════════════════
The following RPCError was thrown running a test:
ext.flutter.inspector.structuredErrors: (-32603) Unexpected DWDS
error for callServiceExtension: WipError -32000 Promise was
collected

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/patch/core_patch.dart 748:28                  get current
packages/vm_service/src/snapshot_graph.dart.js 1870:41                              new
packages/vm_service/src/snapshot_graph.dart.js 2530:23                              <fn>
packages/vm_service/src/snapshot_graph.dart.js 2538:76                              [_call]
packages/vm_service/src/snapshot_graph.dart.js 2476:27                              callServiceExtension
packages/devtools_app_shared/src/service/service_extension_manager.dart.js 1042:91  <fn>
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 622:19                 <fn>
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 647:23                 <fn>
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 541:3                  _asyncStartSync
packages/devtools_app_shared/src/service/service_extension_manager.dart.js 1049:40  call
packages/devtools_app_shared/src/service/service_extension_manager.dart.js 1084:62  <fn>
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 622:19                 <fn>
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 647:23                 <fn>
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 541:3                  _asyncStartSync
packages/devtools_app_shared/src/service/service_extension_manager.dart.js 1157:30  callExtension
packages/devtools_app_shared/src/service/service_extension_manager.dart.js 1186:51  <fn>
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 622:19                 <fn>
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 647:23                 <fn>
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 593:31                 <fn>
dart-sdk/lib/async/zone.dart 1538:47                                                _rootRunUnary
dart-sdk/lib/async/zone.dart 1429:19                                                runUnary
dart-sdk/lib/async/future_impl.dart 208:18                                          handleValue
dart-sdk/lib/async/future_impl.dart 932:44                                          handleValueCallback
dart-sdk/lib/async/future_impl.dart 961:13                                          _propagateToListeners
dart-sdk/lib/async/future_impl.dart 535:9                                           <fn>
dart-sdk/lib/async/zone.dart 1525:13                                                _rootRun
dart-sdk/lib/async/zone.dart 1422:19                                                run
dart-sdk/lib/async/zone.dart [1321](https://github.com/flutter/devtools/actions/runs/12798927680/job/35683997493#step:4:1322):7                                                 runGuarded
dart-sdk/lib/async/zone.dart 1362:23                                                callback
dart-sdk/lib/async/schedule_microtask.dart 40:11                                    _microtaskLoop
dart-sdk/lib/async/schedule_microtask.dart 49:5                                     _startMicrotaskLoop
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 186:7                  <fn>

The test description was:
  end to end extensions flow