refactor xvfb action commands

Author: sbillinge

Diff for: .github/workflows/main.yml

@@ -46,13 +46,11 @@ jobs:
           conda install --file requirements/test.txt
           pip install .
 
-      - name: Use Xvfb Action
+      - name: Use Xvfb Action and run tests
         uses: GabrielBB/xvfb-action@v1
-
-      - name: Validate diffpy.pdfgui
-        shell: bash -l {0}
-        run: |
-          conda activate test
-          coverage run -m pytest -vv -s
-          coverage report -m
-          codecov
+        with:
+          run: |
+            conda activate test
+            coverage run -m pytest -vv -s
+            coverage report -m
+            codecov