feat: enhance test coverage reporting with diff-cover integration

.github/workflows/python.yml

@@ -5,13 +5,13 @@ permissions:
 
 on:
   push:
-    branches: [ 'main' ]
+    branches: ["main"]
     paths:
-      - 'python/**'
+      - "python/**"
   pull_request:
-    branches: [ '*' ]
+    branches: ["*"]
     paths:
-      - 'python/**'
+      - "python/**"
 
 jobs:
   lint:
@@ -21,16 +21,16 @@ jobs:
         working-directory: ./python
 
     steps:
-    - uses: actions/checkout@v4
+      - uses: actions/checkout@v4
 
-    - name: Install Ruff
-      uses: astral-sh/ruff-action@v3
+      - name: Install Ruff
+        uses: astral-sh/ruff-action@v3
 
-    - name: Ruff Format
-      run: ruff format --check --config ./pyproject.toml .
+      - name: Ruff Format
+        run: ruff format --check --config ./pyproject.toml .
 
-    - name: Ruff Lint
-      run: ruff check --config ./pyproject.toml .
+      - name: Ruff Lint
+        run: ruff check --config ./pyproject.toml .
 
   unit_test:
     runs-on: ubuntu-latest
@@ -39,19 +39,24 @@ jobs:
         working-directory: ./python
 
     steps:
-    - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
+        with:
+          fetch-depth: 0
 
-    - name: Set up Python
-      uses: actions/setup-python@v4
-      with:
-        python-version-file: "./python/pyproject.toml"
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version-file: "./python/pyproject.toml"
 
-    - name: Install uv
-      uses: astral-sh/setup-uv@v6
+      - name: Install uv
+        uses: astral-sh/setup-uv@v6
 
-    - name: Install the project
-      run: uv sync --locked --all-extras --dev
+      - name: Install the project
+        run: uv sync --locked --all-extras --dev
 
-    - name: Run tests
-      run: uv run pytest
+      - name: Run tests
+        run: uv run pytest valuecell/core/ --cov=valuecell.core --cov-report=xml --cov-report=term
 
+      - name: Check coverage
+        run: |
+          uv run diff-cover coverage.xml --fail-under=90

python/pyproject.toml

@@ -31,6 +31,7 @@ dev = [
     "pytest>=7.4.0",
     "pytest-cov>=4.1.0",
     "pytest-asyncio>=1.0.0",
+    "diff-cover>=9.0.0",
 ]
 
 [dependency-groups]
@@ -45,6 +46,7 @@ test = [
     "pytest>=7.4.0",
     "pytest-cov>=4.1.0",
     "pytest-asyncio>=1.0.0",
+    "diff-cover>=9.0.0",
 ]
 
 [tool.ruff]