CODEWITHSUNDEEP
pythonpytest
ajwood
ajwood

Reputation: 19057

How can I parametrize tests to run with different fixtures in pytest?

From the pytest documentation:

@pytest.mark.parametrize allows one to define multiple sets of arguments and fixtures at the test function or class.

It looks like this means that pytest.mark.parametrize can mark a test to run with multiple sets of fixtures? I can find plenty examples of parametrizing arguments, but I can't figure out how to parametrize different sets of fixtures.

I think this answer comes close, but that's really just parametrizing arguments, then resolving the different fixtures in the test body.

Is it possible to mark a test to run multiple times, using different sets of fixtures?

Note I'm trying to do something like this:

import pytest

# some data fixutres
@pytest.fixture()
def data1():
    """Create some data"""

@pytest.fixture()
def data2():
    """Create some different data"""

@pytest.fixture()
def data3():
    """Create yet different data"""


# The tests
@pytest.mark.parametrize('data', [data1, data2])
def test_foo(data):
    """Test something that makes sense with datasets 1 and 2"""

@pytest.mark.parametrize('data', [data2, data3])
def test_bar(data):
    """Test something that makes sense with datasets 2 and 3"""

Upvotes: 7

Views: 2286

Answers (1)

Aaron
Aaron

Reputation: 7048

You can do this with the pytest-lazy-fixture plugin:

import pytest
from pytest_lazyfixture import lazy_fixture

@pytest.fixture()
def fixture1():
    return "data1"

@pytest.fixture()
def fixture2():
    return "data2"

@pytest.fixture()
def fixture3():
    return "data3"

@pytest.mark.parametrize("data", [lazy_fixture("fixture1"),
                                  lazy_fixture("fixture2")])
def test_foo(data):
    assert data in ("data1", "data2")

@pytest.mark.parametrize("data", [lazy_fixture("fixture2"),
                                  lazy_fixture("fixture3")])
def test_bar(data):
    assert data in ("data2", "data3")

Note that there's a proposal to add similar functionality directly to pytest: https://docs.pytest.org/en/latest/proposals/parametrize_with_fixtures.html

Upvotes: 4

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