Update GitHub Actions workflow to run tests on multiple OS environments

Author: Vianpyro

.github/workflows/pytest.yml

@@ -29,12 +29,13 @@ jobs:
     - name: Install dependencies
       run: |
         pip install -r requirements.txt
-
-    - name: Test with pytest
-      run: |
         pip install pytest pytest-cov
-        if [[ "${{ matrix.os }}" == "windows-latest" ]]; then
-          python -m pytest --doctest-modules --junitxml=junit/test-results.xml --cov=com --cov-report=xml --cov-report=html
-        else
-          python3 -m pytest --doctest-modules --junitxml=junit/test-results.xml --cov=com --cov-report=xml --cov-report=html
-        fi
+
+    - matrix.os: ubuntu-latest
+      run: python -m pytest --doctest-modules --junitxml=junit/test-results.xml --cov=com --cov-report=xml --cov-report=html
+
+    - matrix.os: macos-latest
+      run: python -m pytest --doctest-modules --junitxml=junit/test-results.xml --cov=com --cov-report=xml --cov-report=html
+
+    - matrix.os: windows-latest
+      run: python -m pytest --doctest-modules --junitxml=junit/test-results.xml --cov=com --cov-report=xml --cov-report=html