pytest Tutorial: Writing Effective Tests in Python

pytest is a powerful testing framework for Python that simplifies unit testing and integration testing. 🧪 Here's a quick guide to get started:

1. Installation

Install pytest via pip:

pip install pytest

🚀 For more on Python package management, check our Python Best Practices guide.

2. Basic Usage

Writing a Test

Create a file test_example.py with:

def test_addition():
    assert 1 + 1 == 2

💡 Run tests using: pytest test_example.py

Test Discovery

pytest automatically finds tests in files named test_*.py or *_test.py.
📂 Example: test_*.py Pattern

3. Advanced Features

• Parameterized Tests

  @pytest.mark.parametrize("a,b,expected", [(1,2,3), (4,5,9)])
  def test_multiplication(a, b, expected):
      assert a * b == expected
  

• Fixtures
  Use fixtures to setup test dependencies:
  🛠️ Learn more: pytest Fixtures

4. Tips & Tricks

• Add pytest.ini for configuration
• Use --verbose for detailed output
• Enable --color for colored test reports

📸 Visualize test structure:

For a deeper dive into testing strategies, explore our Python Testing Guide. 📚