Use tox to run the tests; avoid an editable install because we're getting namespace errors.

Author: jamadden

.github/workflows/tests.yml

@@ -31,13 +31,11 @@ jobs:
         cache-dependency-path: 'setup.py'
     - name: Install dependencies
       run: |
-        python -m pip install -U pip setuptools wheel
-        python -m pip install -U coverage zope.testrunner
-        python -m pip install -U -e ".[test]"
+        python -m pip install -U pip
+        python -m pip install -U tox
     - name: Test
       run: |
-        coverage run -m zope.testrunner --test-path=src
-        coverage report
+        tox -v -e py
     - name: Lint
       if: matrix.python-version == '3.12'
       run: |

tox.ini

@@ -10,6 +10,8 @@ deps =
     zope.testrunner
 commands =
     coverage run -p -m zope.testrunner --test-path=src
+    coverage combine
+    coverage report
 passenv = HOME
 
 [testenv:docs]