pytest-type-safety
Enforce type safety in all tests: type annotations for test functions and fixtures, mock autospec patterns, mypy configuration for tests, type-safe assertions, generic type handling in mocks. Includes protocol-based typing and cast patterns for complex scenarios. Use when: Writing type-safe tests, configuring mypy for test files, using protocols for mocks, enforcing type checking in CI/CD, or debugging type-related test issues.
What this skill does
# Pytest Type Safety
## Quick Start
Add type annotations to every test function and fixture:
```python
from __future__ import annotations
from typing import Any, AsyncGenerator
from unittest.mock import AsyncMock
import pytest
# ✅ Type annotations on fixture
@pytest.fixture
def create_test_order() -> Any:
def _create(order_id: str = "123") -> Order:
return Order(...)
return _create
# ✅ Type annotations on test
@pytest.mark.asyncio
async def test_extract_orders(
create_test_order: Any,
mock_gateway: AsyncMock,
) -> None:
"""Test function with full type safety."""
use_case = ExtractOrdersUseCase(gateway=mock_gateway)
result = await use_case.execute()
assert result is not None
```
## When to Use
- Write type-safe tests
- Configure mypy for test files
- Use protocols for mocks
- Enforce type checking in CI/CD
- Debug type-related test issues
## Key Patterns
### Test Functions
```python
def test_product_title() -> None:
"""Test product title creation."""
title: ProductTitle = ProductTitle("Laptop")
assert title.value == "Laptop"
```
### Fixtures
```python
@pytest.fixture
def create_test_line_item() -> Callable[..., LineItem]:
"""Factory for creating line items."""
def _create(
product_id: str = "prod_1",
title: str = "Test Product",
quantity: int = 1,
) -> LineItem:
return LineItem(...)
return _create
```
### Create_Autospec for Type-Safe Mocks
```python
from unittest.mock import create_autospec
# ✅ Mock with autospec enforces interface
def test_with_autospec() -> None:
mock = create_autospec(ShopifyPort, instance=True)
mock.fetch_orders.return_value = []
# mock.typo_method() raises AttributeError
```
### Mypy Configuration
```toml
# pyproject.toml
[tool.mypy]
python_version = "3.11"
strict = true
disallow_untyped_defs = true
[[tool.mypy.overrides]]
module = "tests.*"
disallow_untyped_defs = true
disallow_any_unimported = false # Allow Any from fixtures
```
### Type-Safe Assertions
```python
def test_order_type_safe(create_test_order: Any) -> None:
order: Order = create_test_order()
assert isinstance(order, Order)
assert isinstance(order.customer_name, str)
```
## Supporting Files
| File | Purpose |
|------|---------|
| [references/type-safety-patterns.md](references/type-safety-patterns.md) | Complete patterns and CI/CD integration |
## Requirements
- Python 3.11+
- pytest >= 7.0
- mypy >= 1.7.0
- pyright >= 1.1.0 (optional)
## See Also
- [pytest-configuration](../pytest-configuration/SKILL.md) - mypy config
- [pytest-mocking-strategy](../pytest-mocking-strategy/SKILL.md) - create_autospec
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