Re-enable Firefox on CI (#324)

Just need to run it with -j 1 (no parallelism)

Fixes #292

Author: kevmoo

.github/workflows/ci.yaml

@@ -60,28 +60,27 @@ jobs:
       env:
         CHROMEDRIVER_ARGS: '--no-sandbox --headless'
 
-  # Disabled; see https://github.com/google/webdriver.dart/issues/292.
-  # test_firefox:
-  #   runs-on: ${{ matrix.os }}
-  #   strategy:
-  #     fail-fast: false
-  #     matrix:
-  #       os: [ubuntu-latest]
-  #       sdk: [3.4, stable, dev]
-  #   steps:
-  #   - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
-  #   - uses: dart-lang/setup-dart@e630b99d28a3b71860378cafdc2a067c71107f94
-  #     with:
-  #       sdk: ${{ matrix.sdk }}
-  #   - uses: browser-actions/setup-firefox@latest
-  #   - uses: browser-actions/setup-geckodriver@eb8b0670366f719ca31703766a8cb7e3ea2c56ed
-  #   - id: install
-  #     name: Install dependencies
-  #     run: dart pub get
-  #   - name: test
-  #     run: |
-  #       export DISPLAY=:99
-  #       geckodriver --port=4445 &
-  #       sudo Xvfb -ac :99 -screen 0 1280x1024x24 > /dev/null 2>&1 &
-  #       dart test --tags ff
-  #     if: always() && steps.install.outcome == 'success'
+  test_firefox:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ ubuntu-latest ]
+        sdk: [ 3.4, stable, dev ]
+    steps:
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+      - uses: dart-lang/setup-dart@e630b99d28a3b71860378cafdc2a067c71107f94
+        with:
+          sdk: ${{ matrix.sdk }}
+      - uses: browser-actions/setup-firefox@latest
+      - uses: browser-actions/setup-geckodriver@eb8b0670366f719ca31703766a8cb7e3ea2c56ed
+      - id: install
+        name: Install dependencies
+        run: dart pub get
+      - name: test
+        run: |
+          export DISPLAY=:99
+          geckodriver --port=4445 &
+          sudo Xvfb -ac :99 -screen 0 1280x1024x24 > /dev/null 2>&1 &
+          dart test -j 1 --tags ff
+        if: always() && steps.install.outcome == 'success'