Add test coverage

.github/workflows/test.yml

@@ -30,4 +30,4 @@ jobs:
         run: uv python install ${{ matrix.python-version }}
 
       - name: Run tests
-        run: uv run --python ${{ matrix.python-version }} pytest
+        run: uv run --python ${{ matrix.python-version }} pytest --cov --cov-config=pyproject.toml

justfile

@@ -27,6 +27,10 @@ format: format_just format_python
 @test:
     uv run pytest
 
+@test_with_coverage:
+    uv run pytest --cov --cov-config=pyproject.toml --cov-report=html
+    open htmlcov/index.html
+
 @update_templates:
     uv run python scripts/update_templates.py
     just _success "Templates updated."

pyproject.toml

@@ -16,6 +16,7 @@ build-backend = "hatchling.build"
 
 [tool.uv]
 dev-dependencies = [
+    "pytest-cov>=5.0.0",
     "pytest>=8.3.3",
     "ruff-lsp>=0.0.57",
     "ruff>=0.6.9",
@@ -50,3 +51,6 @@ section-order = ["future", "standard-library", "third-party", "first-party", "lo
 
 [tool.ruff.lint.per-file-ignores]
 "**/{tests}/*" = ["S101"]
+
+[tool.coverage.run]
+source = ["src/"]