ci: exercise unit tests in CI

.github/workflows/test.yml

@@ -13,19 +13,31 @@ jobs:
       run:
         shell: bash -l {0}
     steps:
-      - name: Checkout repository
-        uses: actions/checkout@v4
-      - name: Set up Python
-        uses: actions/setup-python@v5
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v5
         with:
           python-version: "3.8"
           cache: "pip"
+
+      - uses: FedericoCarboni/setup-ffmpeg@v2
+
       - name: Install dependencies and package
-        run: pip install -e . mypy
-      - name: Minimal test, --help should work
-        run: ctc-segmenter --help
-      - name: Code quality test, mypy should pass
+        run: pip install -e . mypy coverage
+
+      - name: Minimal code quality test, mypy should pass
         run: mypy aligner
+
+      - uses: actions/cache@v4
+        with:
+          path: /home/runner/.cache/torch
+          key: torch-cache
+
+      - name: Run unit tests
+        run: coverage run -m unittest discover aligner.tests -v
+
+      - run: coverage report
+
       - name: Make sure the CLI stays fast
         id: cli-load-time
         run: |
@@ -44,6 +56,7 @@ jobs:
             echo "Please run 'PYTHONPROFILEIMPORTTIME=1 ctc-segmenter -h 2> importtime.txt; tuna importtime.txt' and tuck away expensive imports so that the CLI doesn't load them until it uses them."; \
             false; \
           fi
+
       - name: Report help speed in PR
         if: github.event_name == 'pull_request'
         uses: mshick/add-pr-comment@v2