Update tests.yml

Author: Miskler

.github/workflows/tests.yml

@@ -41,7 +41,8 @@ jobs:
           python -m pip install --upgrade pip
           pip install -r requirements.txt
           python -m camoufox fetch
+          sudo apt install xvfb
 
       - name: Run tests
         run: |
-          make test-quick
+          xvfb-run make test-quick