Test test_kernelapp.py only

Author: davidbrochart

.github/workflows/ci.yml

@@ -47,7 +47,7 @@ jobs:
         timeout-minutes: 15
         if: ${{ !startsWith( matrix.python-version, 'pypy' ) && !startsWith(matrix.os, 'windows') }}
         run: |
-          hatch run cov:test --cov-fail-under 50
+          hatch run cov:pytest -v tests/test_kernelapp.py
 
       - name: Run the tests on pypy
         timeout-minutes: 15