Trigger the workflow on push or pull-request events.

.github/workflows/run_tests.yml

@@ -2,18 +2,17 @@
 
 name: run tests
 
-on:
-  push:
-    branches:
-      - master
-      - ci-test
+# Triggers the workflow on push or pull-request events.
+on: [push, pull_request]
 
 jobs:
   tests:
     runs-on: ubuntu-latest
     strategy:
       matrix:
+        # Run on earliest and latest supported python versions.
         python-version: ["3.7", "3.11"]
+        # Run linters and pytests.
         testsuite: ["linters", "pytest"]
     steps:
       - uses: actions/checkout@v4
@@ -24,9 +23,10 @@ jobs:
         run: |
           python -m pip install --upgrade pip
           pip install tox
-      - name: run tests
+      - name: run linters
+        # Linters are only run on the earliest supported python version.
         if: ${{ matrix.python-version == '3.7' && matrix.testsuite == 'linters' }}
         run: tox -e py3-pytest
-      - name: run linters
+      - name: run pytest
         if: ${{ matrix.testsuite == 'pytest' }}
         run: tox -e mypy,pep8,pylint