`flutter test --platform chrome` hangs on "Loading x_test.dart" on Windows

### Steps to reproduce

On Windows:

- `flutter create webtestapp`
- `cd webtestapp`
- `flutter test --platform chrome`

### Expected results

The test should run and complete.

### Actual results

The test never runs, the output stalls forever (or at least longer than I've had the patience to wait) on "loading D:/Dev/Temp Projects/webtestapp/test/widget_test.dart".

![Image](https://github.com/user-attachments/assets/47bb3cb0-75f4-4673-b3b4-aa4e95dfeaa8)

With `-v`:

![Image](https://github.com/user-attachments/assets/5fe81348-489c-4cc6-b28c-32d10e4a2c44)

Note: I do see a Chrome process spawned that is presumably the headless version that should be running the tests:

![Image](https://github.com/user-attachments/assets/96f916ef-d7db-4da8-a717-3b0df8f30d9b)

I see this on my local PC, but also on GitHub Actions where I was trying to enable Windows tests for DevTools.

### Code sample

<details open><summary>Code sample</summary>

No code required, just use the default `flutter create` app as noted in steps to reproduce.

</details>


### Screenshots or Video

<details open>
<summary>Screenshots / Video demonstration</summary>

![Image](https://github.com/user-attachments/assets/232824cd-c3f9-45bf-8d05-a9de0f2997f1)

![Image](https://github.com/user-attachments/assets/b5cc2eeb-43f2-4054-9412-371be4b5d7ec)

</details>


### Logs

<details open><summary>Logs</summary>

```console
PS D:\Dev\Temp Projects\webtestapp> flutter test -v --platform chrome
[   +1 ms] executing: [D:\Dev\Google\Flutter\Flutter main/] git -c log.showSignature=false log -n 1 --pretty=format:%H
[  +30 ms] Exit code 0 from: git -c log.showSignature=false log -n 1 --pretty=format:%H
[        ] b007899d3a7a072e880e3984856c777cc9c5082b
[        ] executing: [D:\Dev\Google\Flutter\Flutter main/] git tag --points-at b007899d3a7a072e880e3984856c777cc9c5082b
[  +30 ms] Exit code 0 from: git tag --points-at b007899d3a7a072e880e3984856c777cc9c5082b
[        ] executing: [D:\Dev\Google\Flutter\Flutter main/] git describe --match *.*.* --long --tags b007899d3a7a072e880e3984856c777cc9c5082b
[  +90 ms] Exit code 0 from: git describe --match *.*.* --long --tags b007899d3a7a072e880e3984856c777cc9c5082b
[        ] 3.29.0-0.0.pre-148-gb007899d3a
[   +1 ms] executing: [D:\Dev\Google\Flutter\Flutter main/] git symbolic-ref --short HEAD
[  +25 ms] Exit code 0 from: git symbolic-ref --short HEAD
[        ] master
[  +49 ms] executing: [D:\Dev\Google\Flutter\Flutter main/] git rev-parse --abbrev-ref --symbolic @{upstream}
[  +25 ms] Exit code 0 from: git rev-parse --abbrev-ref --symbolic @{upstream}
[        ] origin/master
[        ] executing: [D:\Dev\Google\Flutter\Flutter main/] git ls-remote --get-url origin
[  +24 ms] Exit code 0 from: git ls-remote --get-url origin
[        ] git@github.com:DanTup/flutter.git
[  +90 ms] Found 1 files which will be executed as Widget Tests.
[   +3 ms] Artifact Instance of 'AndroidGenSnapshotArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'AndroidInternalBuildArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterWebSdk' is not required, skipping update.
[        ] Artifact Instance of 'LegacyCanvasKitRemover' is not required, skipping update.
[   +1 ms] Artifact Instance of 'WindowsEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerDebugSymbols' is not required, skipping update.
[  +20 ms] Artifact Instance of 'MaterialFonts' is not required, skipping update.
[        ] Artifact Instance of 'GradleWrapper' is not required, skipping update.
[        ] Artifact Instance of 'AndroidGenSnapshotArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'AndroidInternalBuildArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IOSEngineArtifacts' is not required, skipping update.
[   +1 ms] Artifact Instance of 'FlutterSdk' is not required, skipping update.
[        ] Artifact Instance of 'WindowsEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerDebugSymbols' is not required, skipping update.
[        ] Artifact Instance of 'IosUsbArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IosUsbArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IosUsbArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IosUsbArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IosUsbArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FontSubsetArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'PubDependencies' is not required, skipping update.
[  +20 ms] Skipping pub get: version match.
[  +74 ms] Generating D:\Dev\Temp Projects\webtestapp\android\app\src\main\java\io\flutter\plugins\GeneratedPluginRegistrant.java
[ +263 ms] No packages with native assets. Skipping native assets compilation.
[   +2 ms] Writing native assets json to file:///D:/Dev/Temp%20Projects/webtestapp/build/native_assets/windows/native_assets.json.
[   +1 ms] Writing D:\Dev\Temp Projects\webtestapp\build\native_assets\windows\native_assets.json done.
[  +52 ms] Stopping scan for flutter_test_config.dart; found project root at D:\Dev\Temp Projects\webtestapp
[   +4 ms] D:\Dev\Google\Flutter\Flutter main\bin\cache\dart-sdk\bin\dartaotruntime.exe D:\Dev\Google\Flutter\Flutter
main\bin\cache\dart-sdk\bin\snapshots\frontend_server_aot.dart.snapshot --sdk-root D:\Dev\Google\Flutter\Flutter main\bin\cache\flutter_web_sdk/
--incremental --target=dartdevc --experimental-emit-debug-metadata -DFLUTTER_WEB_USE_SKIA=true -DFLUTTER_WEB_USE_SKWASM=false --output-dill
C:\Users\danny\AppData\Local\Temp\flutter_tools.dab1be9f\flutter_test.8458c2a8\out --packages D:\Dev\Temp
Projects\webtestapp\.dart_tool\package_config.json -Ddart.vm.profile=false -Ddart.vm.product=false --enable-asserts --track-widget-creation
--filesystem-root D:\Dev\Temp Projects\webtestapp\test --filesystem-root
C:\Users\danny\AppData\Local\Temp\flutter_tools.dab1be9f\flutter_test.8458c2a8\ --filesystem-scheme org-dartlang-app --initialize-from-dill
build\80b1a4cf4e7b90e1ab5f72022a0bc624.cache.dill.track.dill --platform
file:///D:/Dev/Google/Flutter/Flutter%20main/bin/cache/flutter_web_sdk/kernel/ddc_outline_sound.dill --verbosity=error --sound-null-safety
[   +6 ms] <- compile org-dartlang-app:///main.dart
00:00 +0: loading D:/Dev/Temp Projects/webtestapp/test/widget_test.dart                                                                              [+5415 ms] Loading test suite test\widget_test.dart.
[        ] Serving tests at http://localhost:65227/static/index.html?managerUrl=ws%3A%2F%2Flocalhost%3A65227%2F0&debug=false
[        ] Launching Chromium (url = http://localhost:65227/static/index.html?managerUrl=ws%3A%2F%2Flocalhost%3A65227%2F0&debug=false, headless =
true, skipCheck = false, debugPort = null)
[        ] Will use Chromium executable at C:\Program Files\Google\Chrome\Application\chrome.exe
[  +91 ms] [CHROME]:
[        ] [CHROME]: DevTools listening on ws://127.0.0.1:65229/devtools/browser/9fd6810e-f331-4c95-823e-ae63e856435e
[ +169 ms] Running test suite test\widget_test.dart.
00:22 +0: loading D:/Dev/Temp Projects/webtestapp/test/widget_test.dart
```

</details>


### Flutter Doctor output

<details open><summary>Doctor output</summary>

```console
PS D:\Dev> flutter doctor -v
[!] Flutter (Channel master, 3.29.0-1.0.pre.148, on Microsoft Windows [Version 10.0.26100.2894], locale en-GB) [1,912ms]
    • Flutter version 3.29.0-1.0.pre.148 on channel master at D:\Dev\Google\Flutter\Flutter main
    ! Warning: `dart` on your path resolves to D:\Tools\Dart\Stable\bin\dart.exe, which is not inside your current Flutter SDK checkout at
      D:\Dev\Google\Flutter\Flutter main. Consider adding D:\Dev\Google\Flutter\Flutter main\bin to the front of your path.
    • Upstream repository git@github.com:DanTup/flutter.git
    • FLUTTER_GIT_URL = git@github.com:DanTup/flutter.git
    • Framework revision b007899d3a (8 days ago), 2025-01-29 14:40:21 +0200
    • Engine revision b007899d3a
    • Dart version 3.8.0 (build 3.8.0-24.0.dev)
    • DevTools version 2.42.0
    • If those were intentional, you can disregard the above warnings; however it is recommended to use "git" directly to perform update checks and
      upgrades.

[✓] Windows Version (11 Pro 64-bit, 24H2, 2009) [1,068ms]

[✓] Android toolchain - develop for Android devices (Android SDK version 35.0.0-rc3) [3.4s]
    • Android SDK at C:\Users\danny\AppData\Local\Android\sdk
    • Platform android-35, build-tools 35.0.0-rc3
    • Java binary at: C:\Program Files\Android\Android Studio\jbr\bin\java
      This is the JDK bundled with the latest Android Studio installation on this machine.
      To manually set the JDK path, use: `flutter config --jdk-dir="path/to/jdk"`.
    • Java version OpenJDK Runtime Environment (build 17.0.9+0--11185874)
    • All Android licenses accepted.

[✓] Chrome - develop for the web [60ms]
    • Chrome at C:\Program Files\Google\Chrome\Application\chrome.exe

[✓] Visual Studio - develop Windows apps (Visual Studio Community 2022 17.10.5) [59ms]
    • Visual Studio at C:\Program Files\Microsoft Visual Studio\2022\Community
    • Visual Studio Community 2022 version 17.10.35122.118
    • Windows 10 SDK version 10.0.22621.0

[✓] Android Studio (version 2023.2) [13ms]
    • Android Studio at C:\Program Files\Android\Android Studio
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 17.0.9+0--11185874)

[✓] VS Code (version 1.96.4) [12ms]
    • VS Code at C:\Users\danny\AppData\Local\Programs\Microsoft VS Code
    • Flutter extension version 3.105.20250203

[✓] VS Code (version 1.93.0-insider) [11ms]
    • VS Code at C:\Users\danny\AppData\Local\Programs\Microsoft VS Code Insiders
    • Flutter extension version 3.95.20240801

[✓] Connected device (3 available) [106ms]
    • Windows (desktop) • windows • windows-x64    • Microsoft Windows [Version 10.0.26100.2894]
    • Chrome (web)      • chrome  • web-javascript • Google Chrome 132.0.6834.160
    • Edge (web)        • edge    • web-javascript • Microsoft Edge 131.0.2903.112

[✓] Network resources [514ms]
    • All expected network resources are available.

! Doctor found issues in 1 category.
```

</details>


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Uh oh!

`flutter test --platform chrome` hangs on "Loading x_test.dart" on Windows #162798

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Uh oh!

flutter test --platform chrome hangs on "Loading x_test.dart" on Windows #162798

Description

Steps to reproduce

Expected results

Actual results

Code sample

Screenshots or Video

Logs

Flutter Doctor output

Metadata

Metadata

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Labels

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Fields

Projects

Milestone

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Development

Issue actions

`flutter test --platform chrome` hangs on "Loading x_test.dart" on Windows #162798