Drop test logic

.github/workflows/run-integration-tests.yml

@@ -6,24 +6,20 @@ name: "Integration tests"
 on:
   issue_comment:
     types: [ created ]
-  # XXX: Drop.
-  pull_request:
 permissions:
   contents: read
 jobs:
   run-integration-tests:
     name: On-demand integration test
-    # XXX: Enable.
-    #if: | 
-    #  github.event.issue.pull_request && contains(github.event.comment.body, '/integration-test')
+    if: | 
+      github.event.issue.pull_request && contains(github.event.comment.body, '/integration-test')
     runs-on: ubuntu-22.04
     steps:
       - name: Check out code
         uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
         with:
           persist-credentials: false
-          # XXX: Enable.
-          #ref: refs/pull/${{ github.event.issue.number }}/head
+          ref: refs/pull/${{ github.event.issue.number }}/head
       - name: Set up JDK
         uses: actions/setup-java@0ab4596768b603586c0de567f2430c30f5b0d2b0 # v3.13.0
         with:
@@ -32,10 +28,5 @@ jobs:
           cache: maven
       - name: Install project to local Maven repository
         run: mvn -T1C install -DskipTests -Dverification.skip
-      - name: Quick test to make sure that Xvfb is present
-        # XXX: Drop this step.
-        run: |
-          echo "XXX_${DISPLAY}_XXX"
-          xvfb-run -- sh -c 'echo "XXX_${DISPLAY}_XXX"'
       - name: Run integration test
         run: xvfb-run ./integration-tests/checkstyle-10.12.4.sh