Test abandoning parent

test/data/abandoning_parent.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+
+nchildren=$1
+shift
+
+for i in `seq 1 $nchildren`; do
+	"$@" &
+done
+
+echo "Started $nchildren for $$"
+# Can be useful when running manually, but commented out so we can count pids in tests
+# pstree -c -p "$$"
+
+echo "Starting one more in subprocess"
+
+( "$@" & )
+
+jobs
+
+# Can be useful when running manually, but commented out so we can count pids in tests
+# pstree -c -p "$$"
+echo "waiting"
+wait

test/test_e2e.py

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+from __future__ import annotations
+from itertools import chain
+import json
+from pathlib import Path
+import subprocess
+import pytest
+
+ABANDONING_PARENT = str(Path(__file__).with_name("data") / "abandoning_parent.sh")
+
+
+def test_sanity(temp_output_dir: str) -> None:
+    command = f"duct -p {temp_output_dir}log_ sleep 0.1"
+    subprocess.check_output(command, shell=True)
+
+
+@pytest.mark.parametrize("num_children", [1, 2, 10])
+def test_abandoning_parent(temp_output_dir: str, num_children: int) -> None:
+    duct_prefix = f"{temp_output_dir}log_"
+    command = f"duct --s-i 0.001 --r-i 0.01 -p {duct_prefix} {ABANDONING_PARENT} {num_children} sleep 0.2"
+    subprocess.check_output(command, shell=True)
+
+    with open(f"{duct_prefix}usage.json") as usage_file:
+        all_samples = [json.loads(line) for line in usage_file]
+
+    all_pids = set(chain.from_iterable(sample["processes"] for sample in all_samples))
+
+    # 1 for each child, 1 for pstree, 1 for parent
+    assert len(all_pids) == num_children + 2