Advanced Python Testing

Accompanying repository for the RSECon24 talk "Advanced Python Testing - mocking, property based testing, snapshot testing"

Link to slides

Setup

Setup requires Python 3 (>=3.10)

git clone https://github.com/abhidg/advanced-python-testing && cd advanced-python-testing
python3 -m venv .venv
source .venv/bin/activate
python3 -m pip install -r requirements.txt

To run the tests:

python3 -m pytest -v

You can also run test files individually:

python3 -m pytest tests/<file> -v

Further reading

Mocking

• Standard library has extensive documentation: https://docs.python.org/3/library/unittest.mock-examples.html
• Specialised libraries moto (AWS), requests-mock, freezegun (datetime mocking)
• Mocks can automatically match specs, see autospec

Property-based testing

• The hypothesis site has introductory articles: https://hypothesis.works/articles/getting-started-with-hypothesis/
• Extensions to hypothesis: schemathesis for API testing, hypothesis-jsonschema for generating JSON complying with a JSON Schema.