IntelliJ Flutter test runner hangs when running "flutter test --platform chrome"

[rich-j]

The IntelliJ Flutter test runner succeeds when not specifying a platform (i.e. VM). Change the Flutter test runner configuration to specify additional args of --platform chrome and the test runner hangs. The terminal command flutter test --platform chrome succeeds.

We expect the IntelliJ test runner to succeed and display the results. This has worked in the past (last time I did this was at least a few years ago).

To test platform specific functionality (e.g. web storage) we need to run some tests on a given platform.

Steps to Reproduce

• In a Flutter web project with tests (i.e. create the default Flutter project with web target), create a run configuration for "Flutter Test" (the default project has test/widget_test.dart).
• Run the test in the IntelliJ test runner and confirm that the test results/errors are displayed.
• Change the Flutter test run configuration Additional args: to include --platform chrome and save.
• Run the test again, the IntelliJ test runner starts with Instantiating tests..., a chrome browser window opens with a tab Flutter Test Browser Host, and then hang...

You can verify that the tests can run by opening a terminal on the project and running the command flutter test --platform chrome.

Version info

`flutter doctor -v` output

flutter doctor -v
[✓] Flutter (Channel stable, 3.24.1, on macOS 14.6.1 23G93 darwin-arm64, locale en-US)
    • Flutter version 3.24.1 on channel stable at /Users/x/Library/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 5874a72aa4 (3 days ago), 2024-08-20 16:46:00 -0500
    • Engine revision c9b9d5780d
    • Dart version 3.5.1
    • DevTools version 2.37.2

[✓] Android toolchain - develop for Android devices (Android SDK version 34.0.0)
    • Android SDK at /Users/x/Library/Android/sdk
    • Platform android-34, build-tools 34.0.0
    • Java binary at: /Applications/Android Studio.app/Contents/jbr/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 17.0.11+0-17.0.11b1207.24-11852314)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 15.4)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Build 15F31d
    • CocoaPods version 1.13.0

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2024.1)
    • Android Studio at /Applications/Android Studio.app/Contents
    • 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 17.0.11+0-17.0.11b1207.24-11852314)

[✓] IntelliJ IDEA Ultimate Edition (version 2024.2.0.2)
    • IntelliJ at /Applications/IntelliJ IDEA.app
    • Flutter plugin version 81.1.3
    • Dart plugin version 242.20629

[✓] Connected device (4 available)
    • iPhone 15 (mobile)              • 26XXXX2D-XXXX-XXXX-XXXX-ED00XXXXXXXX • ios            • com.apple.CoreSimulator.SimRuntime.iOS-17-5 (simulator)
    • macOS (desktop)                 • macos                                • darwin-arm64   • macOS 14.6.1 23G93 darwin-arm64
    • Mac Designed for iPad (desktop) • mac-designed-for-ipad                • darwin         • macOS 14.6.1 23G93 darwin-arm64
    • Chrome (web)                    • chrome                               • web-javascript • Google Chrome 127.0.6533.120

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

• No issues found!