TST/MAINT: Test on different OSes and make pytest output verbose

Author: Kai-Striega

.github/workflows/pythonpackage.yml

@@ -5,11 +5,12 @@ on: [push, pull_request]
 jobs:
   build:
 
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
     strategy:
       max-parallel: 4
       matrix:
-        python-version: ["3.7", "3.8", "3.9", "3.10"]
+        os: [ubuntu-latest, macos-latest, windows-latest]
+        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11"]
 
     steps:
     - uses: actions/checkout@v3
@@ -34,4 +35,4 @@ jobs:
     - name: Test with pytest
       run: |
         pip install pytest
-        pytest
+        pytest -v