Fix coverage report and add coverage target (#303)

Coverage on CI was not configured for its use of multiprocessing.

Author: PGijsbers

.github/workflows/tests.yml

@@ -44,7 +44,9 @@ jobs:
           jobs="${{ matrix.mutations == true && '1' || 'auto' }}"
           docker compose exec python-api coverage run -m pytest -n "$jobs" -v -m "$marker"
       - name: Produce coverage report
-        run: docker compose exec python-api coverage xml
+        run: |
+          docker compose exec python-api coverage combine
+          docker compose exec python-api coverage xml
       - name: Upload results to Codecov
         uses: codecov/codecov-action@v4
         with:

codecov.yaml

@@ -0,0 +1,8 @@
+coverage:
+  status:
+    project:
+      default:
+        target: auto
+    patch:
+      default:
+        target: 100%

pyproject.toml

@@ -47,6 +47,8 @@ docs = [
 
 [tool.coverage.run]
 branch=true
+concurrency=["multiprocessing"]
+parallel=true
 
 [tool.coverage.report]
 show_missing=true