Update pr-check.yaml

Author: ddebrunner

.github/workflows/pr-check.yaml

@@ -20,6 +20,10 @@ jobs:
       - uses: actions/setup-node@v4
         with:
           node-version: "20"
+      - run: |
+        npm ci
+      - run: xvfb-run -a npm test
+        if: runner.os == 'Linux'
       - name: tests
         run: |
           npm ci