diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index b2d475c..b050edd 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -16,4 +16,7 @@ jobs:
       - uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
+      # src/ layout: the package must be installed to be importable.
+      - run: python -m pip install -e .
       - run: python -m unittest discover -s tests -v
+      - run: apple-notes --help