pythrick/pytest-presentation

Python Testing with pytest

What Is pytest?

• Command-line tool that automatically finds tests you've written, run the tests and reports the results.
• Can be used by development teams, QA teams, individuals practicing TDD and open source projects.
• Project all over internet switched from unittest or nose to pytest, including Mozilla and Dropbox.

Why use pytest?

• Simple tests are simple to write in pytest.
• Complex tests are still simple to write.
• Tests are easy to read.
• Tests are easy to read. (So important it’s listed twice.)
• You can get started in seconds.
• You use assert to fail a test, not things like self.assertEqual() or self.assertLessThan(). Just assert.
• You can use pytest to run tests written for unittest or nose.

Setup

Virtualenv

python -m venv .venv
source .venv/bin/activate

Add main module to Python Path

 export PYTHONPATH=$PYTHONPATH:$(pwd)/pytest_presentation

Install

python -m pip install -r requirements.txt

Introduction

pytest -v tests/test_1_intro.py

Testing module

pytest -v tests/test_2_add.py

Testing exceptions

pytest -v tests/test_3_exceptions.py

Parametrize

pytest -v tests/test_4_parametrize.py

Skip

pytest -v tests/test_5_skip.py

Subset of Tests

Single Test File/Module

pytest -v tests/test_1_intro.py

Single Test Function

pytest -v tests/test_1_intro.py::test_value_in_list

Single directory

pytest -v tests/func/

Single Test Class

pytest -v tests/func/test_6_integration.py::TestIntegration

Single Test Method of a Test Class

pytest -v tests/func/test_6_integration.py::TestIntegration::test_list_tasks

A set of tests based on Test Name

pytest -v -k task

Fixtures

pytest -v tests/test_7_fixtures.py

Plugins

• pytest-cov

• pytest-django

• pytest-mock

• pytest-env

• pytest-freezegun

• pytest-repeat: Run Tests More Than Once

• pytest-xdist: Run Tests in Parallel

• pytest-timeout: Put Time Limits on Your Tests

• pytest-instafail: See Details of Failures and Errors as They Happen

• pytest-sugar: Instafail + Colors + Progress Bar

• pytest-emoji: Add Some Fun to Your Tests

• pytest-html: Generate HTML Reports for Test Sessions

• pytest-pycodestyle, pytest-pep8: Comply with Python’s Style Guide

• pytest-flake8: Check for Style Plus Linting

• pytest-selenium: Test with a Web Browser

• pytest-django: Test Django Applications

• pytest-flask: Test Flask Applications

Plugins from Docs Plugins Compatíveis

pytest-mock

python -m pip install pytest-mock 

pytest -v tests/test_8_mocker.py

Mock Requests

pytest-cov

python -m pip install pytest-cov

pytest -v --cov=pytest_presentation tests/

pytest -v --cov-report html  --cov=pytest_presentation tests/

Debuggers and Pycharm

pytest --no-cov

Construir seus próprios plugins

Palestra - Rafael Henrique (PyBR 2019)

Reference

Book: Python Testing with pytest

Author

Patrick Rodrigues