@@ -36,8 +36,12 @@ jobs:
 #         # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
 #         flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
     - name: Test with pytest
-      run: |
-        pytest --ignore=W605
+      uses: GabrielBB/xvfb-action@v1.2
+      with:
+        run: |
+          pytest --ignore=W605
+        env:
+          MPLBACKEND: TkAgg
 
   codecov:
     # If all tests pass:
 
@@ -1,14 +1,17 @@
+dist: xenial
 language: python
 python:
     - "3.7"
+services:
+    - xvfb
 
 install:
     - pip install -r requirements.txt
     - pip list
     - pip install -e .
 
 env:
-    - MPLBACKEND=Agg
+    - MPLBACKEND=TkAgg
 
 script:
      # your test script goes here