Fix CoverageWarning

Author: 5yutan5

.github/workflows/test.yml

@@ -33,8 +33,11 @@ jobs:
       - run: poetry run pip install -U ${{ matrix.qt }}
 
       - run: >-
-          poetry run pytest --color=yes --cov
-          --cov-report=term-missing --cov-report=xml
+          poetry run pytest tests --color=yes
+          --cov=qdarktheme
+          --cov=tests
+          --cov-report=term-missing
+          --cov-report=xml
 
       - uses: codecov/codecov-action@v3
         with:
@@ -66,8 +69,11 @@ jobs:
           poetry-install--only: github-actions,test,main
 
       - run: >-
-          poetry run pytest --color=yes --cov
-          --cov-report=term-missing --cov-report=xml
+          poetry run pytest --color=yes
+          --cov=qdarktheme
+          --cov=tests
+          --cov-report=term-missing
+          --cov-report=xml
           --ignore=tests/test_widget_gallery.py
           --ignore=tests/test_qdarktheme_with_qt.py
           -p no:pytest-qt