Describe the bug
VSCode Test Runner doesn't run all tests, some are left unrun.

To Reproduce
Steps to reproduce the behavior:

1. Go to the testing tab
2. Click on the button that runs all tests (Run tests)

Expected behavior
All tests should run

Screenshots
Added

Versions (please complete the following information):

• VS Code version: 1.60.2
• Dart extension version: v3.27.0
• Dart/Flutter SDK version:
• Flutter (Channel stable, 2.5.1, on macOS 11.6 20G165 darwin-x64, locale en-CA)
  Dart SDK version: 2.14.2 (stable) (Wed Sep 15 12:32:06 2021 +0200) on "macos_x64
  
  "