Minor CI and test config improvements (#533)

* Fix tox coverage config

Run coverage after py3.13 tests, and combine+report in separate steps
to get simpler reporting semantics when using `tox p`.

* Improve CI job names

Author: sirosen

.github/workflows/build.yaml

@@ -14,7 +14,7 @@ jobs:
             py: "3.9"
 
     runs-on: ubuntu-latest
-    name: "Run '${{ matrix.toxenv }}' on python ${{ matrix.py }}"
+    name: "'${{ matrix.toxenv }}' on py${{ matrix.py }}"
     steps:
       - uses: actions/checkout@v4
 
@@ -61,10 +61,10 @@ jobs:
   ci-test-matrix:
     strategy:
       matrix:
-        os: [ubuntu-latest, windows-latest, macos-latest]
+        os: [ubuntu, windows, macos]
         py: ['3.9', '3.10', '3.11', '3.12', '3.13']
-    name: "Run tests on ${{ matrix.os }}, py${{ matrix.py }}"
-    runs-on: ${{ matrix.os }}
+    name: "Test on ${{ matrix.os }}, py${{ matrix.py }}"
+    runs-on: "${{ matrix.os }}-latest"
     steps:
       - uses: actions/checkout@v4
 
@@ -98,7 +98,7 @@ jobs:
       - name: test
         run: |
           python -m tox run -m ci -- --junitxml pytest.{envname}.xml
-          python -m tox run -e cov
+          python -m tox run -e cov_combine,cov_report
 
       - uses: actions/upload-artifact@v4
         with:

tox.ini

@@ -6,7 +6,8 @@ envlist =
     py{313,312,311,310,39}
     py{39,313}-{json5,pyjson5}{,-format}
     py{39,313}-{disable_orjson}
-    cov
+    cov_combine
+    cov_report
 skip_missing_interpreters = true
 minversion = 4.0.0
 
@@ -39,13 +40,19 @@ skip_install = true
 commands = coverage erase
 depends =
 
-[testenv:cov]
-description = "combine and report coverage data"
+[testenv:cov_combine]
+description = "combine coverage data"
+deps = coverage
+skip_install = true
+commands = coverage combine
+depends = py{,38,39,310,311,312,313}{,-mindeps,-format,-json5,-pyjson5,-disable_orjson}
+
+[testenv:cov_report]
+description = "report test coverage"
 deps = coverage
 skip_install = true
-commands_pre = - coverage combine
 commands = coverage report --skip-covered
-depends = py{,38,39,310,311,312}{,-mindeps,-format,-json5,-pyjson5,-disable_orjson}
+depends = cov_combine
 
 [testenv:mypy]
 description = "check type annotations with mypy"