What are pytest fixtures and how can I parameterize them?

What are pytest fixtures and how can I parameterize them?

Pytest fixtures are a way to set up some context or state for your tests. You can parameterize them to run tests with different inputs.

Can you give me an example of a parameterized fixture?

Sure! Here's a simple example:

import pytest

def pytest_addoption(parser):
    parser.addoption('--myparam', action='store', default='default_value')

@pytest.fixture(params=['value1', 'value2', 'value3'])
def my_fixture(request):
    return request.param

def test_example(my_fixture):
    assert my_fixture in ['value1', 'value2', 'value3']

How does the params argument work in the fixture?

The params argument allows you to specify a list of values that the fixture will use. Each test that uses this fixture will run once for each value in the list.

Can I use fixtures with classes in pytest?

Yes, you can use fixtures with classes. You can define a fixture at the class level, and it will be available to all test methods in that class.