checkPlugin: Add `frontend-tests.yml` GitHub workflow

src/bin/plugins/checkPlugin.js

@@ -149,7 +149,7 @@ fs.readdir(pluginPath, (err, rootFiles) => {
   if (files.indexOf('.git') === -1) throw new Error('No .git folder, aborting');
   prepareRepo();
 
-  for (const fn of ['backend-tests.yml', 'npmpublish.yml']) {
+  for (const fn of ['backend-tests.yml', 'frontend-tests.yml', 'npmpublish.yml']) {
     checkFile(`src/bin/plugins/lib/${fn}`, `.github/workflows/${fn}`);
   }
 

src/bin/plugins/lib/frontend-tests.yml

@@ -0,0 +1,92 @@
+# Publicly credit Sauce Labs because they generously support open source
+# projects.
+name: "frontend tests powered by Sauce Labs"
+
+on: [push]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Generate Sauce Labs strings
+      id: sauce_strings
+      run: |
+        printf %s\\n '::set-output name=name::${{github.event.repository.name}} ${{ github.workflow }} - ${{ github.job }}'
+        printf %s\\n '::set-output name=tunnel_id::${{ github.run_id }}-${{ github.run_number }}-${{ github.job }}'
+
+    - uses: actions/setup-node@v2
+      with:
+        node-version: 12
+
+    - name: Check out Etherpad core
+      uses: actions/checkout@v2
+      with:
+        repository: ether/etherpad-lite
+
+    - name: Check out the plugin
+      uses: actions/checkout@v2
+      with:
+        path: ./node_modules/__tmp
+
+    - name: export GIT_HASH to env
+      id: environment
+      run: |
+        cd ./node_modules/__tmp
+        echo "::set-output name=sha_short::$(git rev-parse --short ${{ github.sha }})"
+
+    - name: Determine plugin name
+      id: plugin_name
+      run: |
+        cd ./node_modules/__tmp
+        npx -c 'printf %s\\n "::set-output name=plugin_name::${npm_package_name}"'
+
+    - name: Rename plugin directory
+      env:
+        PLUGIN_NAME: ${{ steps.plugin_name.outputs.plugin_name }}
+      run: |
+        mv ./node_modules/__tmp ./node_modules/"${PLUGIN_NAME}"
+
+    - name: Install plugin dependencies
+      env:
+        PLUGIN_NAME: ${{ steps.plugin_name.outputs.plugin_name }}
+      run: |
+        cd ./node_modules/"${PLUGIN_NAME}"
+        npm ci
+
+    # This must be run after setting up the plugin, otherwise npm will try to
+    # hoist common dependencies by removing them from src/node_modules and
+    # installing them in the top-level node_modules. As of v6.14.10, npm's hoist
+    # logic appears to be buggy, because it sometimes removes dependencies from
+    # src/node_modules but fails to add them to the top-level node_modules. Even
+    # if npm correctly hoists the dependencies, the hoisting seems to confuse
+    # tools such as `npm outdated`, `npm update`, and some ESLint rules.
+    - name: Install Etherpad core dependencies
+      run: src/bin/installDeps.sh
+
+    - name: Create settings.json
+      run: cp settings.json.template settings.json
+
+    - name: Disable import/export rate limiting
+      run: |
+        sed -e '/^ *"importExportRateLimiting":/,/^ *\}/ s/"max":.*/"max": 0/' -i settings.json
+
+    - name: Remove standard frontend test files
+      run: rm -rf src/tests/frontend/specs
+
+    - uses: saucelabs/sauce-connect-action@v1
+      with:
+        username: ${{ secrets.SAUCE_USERNAME }}
+        accessKey: ${{ secrets.SAUCE_ACCESS_KEY }}
+        tunnelIdentifier: ${{ steps.sauce_strings.outputs.tunnel_id }}
+
+    - name: Run the frontend tests
+      shell: bash
+      env:
+        SAUCE_USERNAME: ${{ secrets.SAUCE_USERNAME }}
+        SAUCE_ACCESS_KEY: ${{ secrets.SAUCE_ACCESS_KEY }}
+        SAUCE_NAME: ${{ steps.sauce_strings.outputs.name }}
+        TRAVIS_JOB_NUMBER: ${{ steps.sauce_strings.outputs.tunnel_id }}
+        GIT_HASH: ${{ steps.environment.outputs.sha_short }}
+      run: |
+        src/tests/frontend/travis/runner.sh