pytest: printing from fixture

Question

I'm writing tests using Pytest. I have a fixture like this:

@pytest.yield_fixture(autouse=True, scope='session')
def manage_tests():
    print("Do stuff...")
    do_stuff()
    yield

I put a print statement there so I could see it in the console when I'm running the tests, for better visibility into what the program is doing. But I don't see that text in the console, I'm guessing pytest swallows it. Is there any way to print from a fixture?

Answer 1

Pytest doesn't not swallow the output, it's just not shown by default. To see output in console, try running test with -s option, like:

pytest -s <path_to_file>

Answer 2

with pytest 3 use this fixture:

@pytest.fixture()
def tprint(request, capsys):
    """Fixture for printing info after test, not supressed by pytest stdout/stderr capture"""
    lines = []
    yield lines.append

    with capsys.disabled():
        for line in lines:
            sys.stdout.write('\n{}'.format(line))