test: improve coverage for core logic (#46)

Author: jy-tan

.github/workflows/ci.yml

@@ -55,7 +55,9 @@ jobs:
   test:
     name: Unit Tests (Python ${{ matrix.python-version }})
     runs-on: ubuntu-latest
+    timeout-minutes: 30
     strategy:
+      fail-fast: false
       matrix:
         python-version: ["3.9", "3.14"]
     steps:
@@ -70,11 +72,31 @@ jobs:
       - name: Setup Python
         run: uv python install ${{ matrix.python-version }}
 
+      - name: Cache uv + Python installs + venv
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cache/uv
+            ~/.local/share/uv/python
+            .venv
+          key: ${{ runner.os }}-uv-${{ matrix.python-version }}-${{ hashFiles('uv.lock') }}
+
       - name: Install dependencies
         run: uv sync --all-extras
 
       - name: Run unit tests
-        run: uv run pytest tests/unit/ -v
+        if: matrix.python-version != '3.9'
+        run: uv run pytest tests/unit/ -q
+
+      - name: Run unit tests with coverage
+        if: matrix.python-version == '3.9'
+        run: uv run pytest tests/unit/ -q --cov=drift/core --cov-report=xml
+
+      - name: Upload coverage to Coveralls
+        if: matrix.python-version == '3.9' && github.event_name == 'push' && github.ref == 'refs/heads/main'
+        uses: coverallsapp/github-action@v2
+        with:
+          file: coverage.xml
 
   build:
     name: Build Package

.gitignore

@@ -224,4 +224,9 @@ __marimo__/
 .DS_Store
 
 # Bug tracking
-**/BUG_TRACKING.md
+**/BUG_TRACKING.md
+
+# Coverage
+coverage.lcov
+coverage.xml
+.coverage

CONTRIBUTING.md

@@ -33,6 +33,9 @@ uv run ty check drift/ tests/          # Type check
 ```bash
 uv run pytest tests/unit/ -v
 
+# Run with coverage
+uv run pytest tests/unit/ -v --cov=drift --cov-report=term-missing
+
 # Run a specific test file
 uv run pytest tests/unit/test_json_schema_helper.py -v
 uv run pytest tests/unit/test_adapters.py -v

pyproject.toml

@@ -53,6 +53,7 @@ dev = [
     "ty>=0.0.1a7",
     "pytest>=8.0.0,<9.0.0",
     "pytest-mock>=3.15.0",
+    "pytest-cov>=7.0.0",
 ]
 
 [project.urls]