Running blocking servers / long running tasks before running a test

test_process_start.py

import time
from multiprocessing import Process

import pytest


def proc_a():
    print("starting proc a")
    i = 1
    # for i in range(10):
    while True:
        time.sleep(1)
        print(f"in proc_a: i={i}")
        i += 1


def proc_b():
    print("starting proc b")
    i = 1
    # for i in range(15):
    while True:
        time.sleep(1)
        print(f"in proc_b: i={i}")
        i += 1


def call_in_process(proc_func):
    p = Process(target=proc_func)
    p.start()
    return p


@pytest.fixture()
def start_a():
    proc = call_in_process(proc_a)
    print(f"Started A: pid is:{proc.pid}")
    yield
    proc.kill()


@pytest.fixture()
def start_b():
    proc = call_in_process(proc_b)
    print(f"Started b: pid is:{proc.pid}")
    yield
    proc.kill()


def test_a(start_a, start_b):
    time.sleep(5)
    assert 1 == 1