conftest.py

import pytest 
import psutil
import requests
import subprocess
from xprocess import ProcessStarter

PORT = 8000

def fetch(url, just_contents=True):
    res = requests.get(f'http://localhost:{PORT}/{url}')
    if just_contents:
        return res.content.decode('utf-8')
    return res

@pytest.fixture
def pelican_server(xprocess):
    class Starter(ProcessStarter):
        # startup pattern
        pattern = f"^Done: Processed "

        # command to start process
        args = ['serve']

    # ensure process is running and return its logfile
    logfile = xprocess.ensure("pelican_server", Starter)

    conn = PORT
    yield conn

    # clean up whole process tree afterwards
    xprocess.getinfo("pelican_server").terminate()


site_rebuilt = False
@pytest.fixture
def rebuild_site():
    """We only want to rebuid the site once and only if bin/serve isn't already
    automaritcally rebuilding it."""

    # Use a global to keep state between runs because I couldn't figure out how
    # to decorate a closure as a pytest.fixture.
    global site_rebuilt

    if not site_rebuilt:

        # Check if automatic rebuilder already running
        for pid in psutil.pids():
            p = psutil.Process(pid)
            if p.name() == "pelican" and p.cmdline()[-1] == "PELICAN_BINSERVE=true":
                site_rebuilt = True
                return True

        # Do the rebuild by running our build script
        out = subprocess.check_output("build").decode("utf-8")
        print(out)
        site_rebuilt = True

    return site_rebuilt