pytest session fixture. run as 'pytest . -s -v'. Output will be http://www.qopy.me/CIuVG0i6QsaFy5dsIKRBKA

conftest.py

from __future__ import print_function
# import unittest
import pytest

@pytest.fixture(scope='session')
def selenium(request):
    print('BEGIN fixture')
    request.addfinalizer(lambda: print('END fixture'))
    return 123

test_456.py

from __future__ import print_function

def fib(n):
    return 1 if n<=2 else fib(n-1)+fib(n-2)


def test_fib_assert_equal(selenium):
    print('begin', selenium)
    assert fib(10) == 55
    print('end', selenium)

def test_fib_assert_true(selenium):
    print('begin', selenium)
    assert fib(10) == 55
    print('end', selenium)

test_789.py

from __future__ import print_function

def fac(n):
    return 1 if n<=2 else fac(n-1)+fac(n-2)


def test_fac_assert_equal(selenium):
    print('begin', selenium)
    assert fac(10) == 55
    print('end', selenium)

def test_fac_assert_true(selenium):
    print('begin', selenium)
    assert fac(10) == 55
    print('end', selenium)