# file scalene/scalene_profiler.py:1629-1645
# lines [1643, 1644, 1645]
# branches ['1643->1644', '1643->1645']

import os
import signal
import pytest
from scalene.scalene_profiler import Scalene

@pytest.fixture
def scalene_setup_and_teardown():
    # Setup code
    Scalene.start = lambda: None
    Scalene.__orig_kill = os.kill
    Scalene.__signals = type('Signals', (), {'start_profiling_signal': signal.SIGCONT})
    Scalene.child_pids = set()
    # Create a child process and add its PID to the set
    pid = os.fork()
    if pid == 0:
        # Child process: wait for a signal
        signal.pause()
    else:
        # Parent process: add child PID to the set
        Scalene.child_pids.add(pid)
    yield
    # Teardown code
    if pid > 0:
        os.kill(pid, signal.SIGKILL)  # Terminate the child process
        Scalene.child_pids.remove(pid)
    Scalene.child_pids.clear()

def test_start_signal_handler(scalene_setup_and_teardown):
    # Test that the signal handler sends the start_profiling_signal to child processes
    Scalene.start_signal_handler(None, None)
    # No direct postconditions to assert; the test is for coverage of the signal sending