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testing-patterns

testing-patterns

github.com/langchain-aiTesting & quality11958 installsUpdated 10w ago
Repository

About testing-patterns

testing-patterns is a skill for developers writing maintainable tests. It covers test organization, mocking, fixtures, integration tests, and coverage targets.

Key features

  1. 01AAA test structure
  2. 02Mocking external services
  3. 03Fixtures and factories
  4. 04Integration test patterns
  5. 05Coverage targets

Use cases

  1. 01Structuring unit tests
  2. 02Mocking email or other services
  3. 03Creating reusable test data
  4. 04Selecting test coverage goals

Install

Copy the command and run it in a terminal.

$npx skills add https://github.com/langchain-ai/skills-benchmarks --skill testing-patterns

After installing, type/testing-patternsin Claude Code to confirm it loaded.

Details

From the project README

Testing Patterns

Write effective, maintainable tests using modern patterns.

Test Structure (AAA Pattern)

def test_user_registration():
    # Arrange
    user_data = {"email": "[email protected]", "password": "secure123"}

    # Act
    result = register_user(user_data)

    # Assert
    assert result.success is True
    assert result.user.email == "[email protected]"

Mocking External Services

from unittest.mock import Mock, patch

@patch('services.email.send_email')
def test_sends_welcome_email(mock_send):
    mock_send.return_value = True

    register_user({"email": "[email protected]"})

    mock_send.assert_called_once_with(
        to="[email protected]",
        template="welcome"
    )

Fixtures and Factories

import pytest
from factories import UserFactory

@pytest.fixture
def user():
    return UserFactory.create(role="admin")

@pytest.fixture
def authenticated_client(user):
    client = TestClient(app)
    client.login(user)
    return client

def test_admin_dashboard(authenticated_client):
    response = authenticated_client.get("/admin")
    assert response.status_code == 200

Integration Tests

@pytest.mark.integration
def test_full_checkout_flow(db_session, stripe_mock):
    # Create test data
    user = create_user()
    product = create_product(price=100)

    # Execute flow
    cart = add_to_cart(user, product)
    order = checkout(cart, payment_method="card")

    # Verify
    assert order.status == "completed"
    assert stripe_mock.charges.create.called

Test Coverage Goals

  • Unit tests: 80%+ coverage
  • Integration tests: Critical paths
  • E2E tests: Happy paths only

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