alternate approach for coverage

.github/workflows/ci-tests.yml

@@ -94,6 +94,9 @@ jobs:
       - name: "tests (py${{ matrix.python-version }})"
         env:
           PY_VER: ${{ matrix.python-version }}
-          COVERAGE: ${{ matrix.coverage }}
         run: |
           nox --session tests -- --verbose
+
+      - name: Upload coverage report
+        uses: codecov/codecov-action@v4
+        if: ${{ matrix.coverage }}

noxfile.py

@@ -28,9 +28,6 @@
 #: GHA-CI environment variable hook.
 PY_VER = os.environ.get("PY_VER", ["3.10", "3.11", "3.12"])
 
-#: GHA-CI environment variable hook.
-COVERAGE = os.environ.get("COVERAGE", False)
-
 #: GHA-CI environment variable hook.
 #: If you change the IRIS_SOURCE here you will also need to change it in
 #: the tests, wheel and benchmark workflows.
@@ -305,13 +302,8 @@ def tests(session: nox.sessions.Session):
     # Install the esmf-regrid source in develop mode.
     session.install("--no-deps", "--editable", ".")
 
-    if COVERAGE:
-        # Execute the tests with code coverage.
-        session.run("pytest", "--cov-report=xml", "--cov")
-        session.run("codecov", "--required")
-    else:
-        # Execute the tests.
-        session.run("pytest")
+    # Execute the tests.
+    session.run("pytest")
 
 
 @nox.session