Use local coverage (#842)

.github/workflows/tests.yml

@@ -40,8 +40,15 @@ jobs:
       - uses: jupyterlab/maintainer-tools/.github/actions/base-setup@v1
       - name: Run Tests
         run: hatch run cov:test
-      - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v3
+      - uses: jupyterlab/maintainer-tools/.github/actions/upload-coverage@v1
+
+  coverage:
+    runs-on: ubuntu-latest
+    needs:
+      - tests
+    steps:
+      - uses: actions/checkout@v3
+      - uses: jupyterlab/maintainer-tools/.github/actions/report-coverage@v1
 
   test_minimum_versions:
     name: Test Minimum Versions
@@ -137,7 +144,7 @@ jobs:
   tests_check: # This job does nothing and is only used for the branch protection
     if: always()
     needs:
-      - tests
+      - coverage
       - test_lint
       - test_docs
       - test_minimum_versions

README.md

@@ -2,7 +2,6 @@
 
 [![Tests](https://github.com/ipython/traitlets/actions/workflows/tests.yml/badge.svg)](https://github.com/ipython/traitlets/actions/workflows/tests.yml)
 [![Documentation Status](https://readthedocs.org/projects/traitlets/badge/?version=latest)](https://traitlets.readthedocs.io/en/latest/?badge=latest)
-[![codecov](https://codecov.io/gh/ipython/traitlets/branch/main/graph/badge.svg?token=HcsbLGEmI1)](https://codecov.io/gh/ipython/traitlets)
 [![Tidelift](https://tidelift.com/subscription/pkg/pypi-traitlets)](https://tidelift.com/badges/package/pypi/traitlets)
 
 |               |                                      |

pyproject.toml

@@ -45,7 +45,7 @@ nowarn = "test -W default {args}"
 
 [tool.hatch.envs.cov]
 features = ["test"]
-dependencies = ["coverage", "pytest-cov"]
+dependencies = ["coverage[toml]", "pytest-cov"]
 [tool.hatch.envs.cov.scripts]
 test = "python -m pytest -vv --cov traitlets --cov-branch --cov-report term-missing:skip-covered {args}"
 nowarn = "test -W default {args}"
@@ -137,6 +137,10 @@ exclude_lines = [
 "@(abc\\.)?abstractmethod",
 ]
 
+[tool.coverage.run]
+relative_files = true
+source = ["traitlets"]
+
 [tool.black]
 line-length = 100
 skip-string-normalization = true