How do I test a Python package?

How do I test a Python package?

To test a Python package, you can use the built-in unittest framework or third-party libraries like pytest. Which one would you like to know more about?

Can you show me an example using pytest?

Sure! First, install pytest using pip install pytest. Then, create a test file, say test_example.py, and write your tests like this:

import pytest
from your_package import your_function

def test_your_function():
    assert your_function(1) == 2

Run the tests with the command pytest in your terminal.

What if I want to test for exceptions?

You can use the pytest.raises context manager to test for exceptions. Here's an example:

def test_your_function_raises():
    with pytest.raises(ValueError):
        your_function(-1)

This will check if your_function raises a ValueError when passed -1.

How do I run the tests automatically?

You can set up continuous integration (CI) tools like GitHub Actions or Travis CI to run your tests automatically on each commit. Would you like to know how to set that up?