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tests/README.md

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+# Unit Tests
+
+## Setup
+
+```bash
+# Install test dependencies
+pip install -r requirements-test.txt
+
+# Run tests
+pytest
+
+# Run with coverage
+pytest --cov=scripts --cov-report=html
+
+# Run specific test file
+pytest tests/test_portfolio.py
+```
+
+## Test Structure
+
+- `test_portfolio.py` - Portfolio CRUD operations
+- `test_fetch_news.py` - RSS feed parsing with mocked responses
+- `test_setup.py` - Setup wizard validation
+- `fixtures/` - Sample RSS and portfolio data
+
+## Coverage Target
+
+60%+ coverage for core functions (portfolio, fetch_news, setup).
+
+## Notes
+
+- Tests use `tmp_path` for file isolation
+- Network calls are mocked with `unittest.mock`
+- `pytest-mock` provides `mocker` fixture for advanced mocking