Manually specify firefox location for package:test on macos

.github/workflows/test.yml

@@ -63,11 +63,11 @@ jobs:
         run: |
           flutter config --no-analytics
       - run: flutter pub get
-      #- run: flutter pub run webcrypto:setup
-      #- run: flutter test
-      #- run: flutter test --platform chrome
-      #- run: flutter test integration_test/webcrypto_test.dart -d macos
-      #  working-directory: ./example
+      - run: flutter pub run webcrypto:setup
+      - run: flutter test
+      - run: flutter test --platform chrome
+      - run: flutter test integration_test/webcrypto_test.dart -d macos
+        working-directory: ./example
       # TODO: Enable chromdriver testing on MacOS when it works reliably
       #- uses: nanasess/setup-chromedriver@v2
       #- name: Run integration_test with chromedriver
@@ -78,8 +78,13 @@ jobs:
       #      --target=integration_test/webcrypto_test.dart \
       #      -d chrome
       - uses: browser-actions/setup-firefox@v1
-      - run: bash -c 'which firefox'
-      - run: flutter pub run test -p firefox #vm,chrome # TODO: Enable firefox if it works
+      - name: flutter pub run test -p vm,chrome,firefox
+        shell: bash
+        # Remove FIREFOX_EXECUTABLE override when flutter upgrades past package:test 1.25.8
+        # Issue is fixed in https://github.com/dart-lang/test/pull/2276
+        run: |
+          export FIREFOX_EXECUTABLE="$(which firefox)"
+          flutter pub run test -p vm,chrome,firefox
   windows:
     name: webcrypto on Windows desktop / Chrome / Firefox
     runs-on: windows-latest