______________________ test_spawn_children[duct-1-plain] _______________________

temp_output_dir = '/private/var/folders/x7/_nsk_h4s1kng41z5pgfbx7sh0000gn/T/pytest-of-runner/pytest-0/test_spawn_children_duct_1_pla3/'
duct_cmd = 'duct', mode = 'plain', num_children = 1

    @pytest.mark.flaky(reruns=3)
    @pytest.mark.parametrize("mode", ["plain", "subshell", "nohup", "setsid"])
    @pytest.mark.parametrize("num_children", [1, 2, 10])
    def test_spawn_children(
        temp_output_dir: str, duct_cmd: str, mode: str, num_children: int
    ) -> None:
        duct_prefix = f"{temp_output_dir}log_"
        script_path = TEST_SCRIPT_DIR / "spawn_children.sh"
        dur = "0.3"
        command = (
            f"{duct_cmd} -q --s-i 0.001 --r-i 0.01 "
            f"-p {duct_prefix} {script_path} {mode} {num_children} {dur}"
        )
        subprocess.check_output(command, shell=True)
    
        with open(f"{duct_prefix}{SUFFIXES['usage']}") as usage_file:
            all_samples = [json.loads(line) for line in usage_file]
    
        # Only count the child sleep processes
        all_child_pids = set(
            pid
            for sample in all_samples
            for pid, proc in sample["processes"].items()
            if "sleep" in proc["cmd"]
        )
        # Add one pid for the hold-the-door process, see spawn_children.sh line 7
        if mode == "setsid":
            assert len(all_child_pids) == 1
        else:
>           assert len(all_child_pids) == num_children + 1
E           assert 0 == (1 + 1)
E            +  where 0 = len(set())

test/duct_main/test_e2e.py:60: AssertionError
=========================== short test summary info ============================
FAILED test/duct_main/test_e2e.py::test_spawn_children[duct-1-plain] - assert 0 == (1 + 1)
 +  where 0 = len(set())