test: assert browser cleanup in runtime

tests/test_addon_metadata.py

@@ -100,3 +100,27 @@ def test_dockerfile_patches_parent_cloakserve_instead_of_copying_a_binary() -> N
 def test_runtime_accepts_docker_port_unpublished_status() -> None:
     runtime_test = (ROOT / "tests/test_runtime.sh").read_text(encoding="utf-8")
     assert 'docker port "$container" 9222/tcp 2>/dev/null || true' in runtime_test
+
+
+def test_runtime_requires_process_baseline_after_cdp_close_and_zero_stopped_pid() -> None:
+    runtime_test = (ROOT / "tests/test_runtime.sh").read_text(encoding="utf-8")
+    assert 'docker top "$container" -eo pid,args' in runtime_test
+    for prefix in ("first", "second"):
+        container = f"${prefix}_container"
+        baseline = (
+            f'{prefix}_baseline="$(capture_process_baseline "{container}")"'
+        )
+        ready_index = runtime_test.index(
+            f'wait_ready "{container}" "${prefix}_port"'
+        )
+        baseline_index = runtime_test.index(baseline)
+        close_index = runtime_test.index(
+            f'probe_and_close_cdp "{container}"', baseline_index
+        )
+        return_index = runtime_test.index(
+            f'assert_processes_return_to_baseline "{container}" "${prefix}_baseline"',
+            close_index,
+        )
+        assert ready_index < baseline_index < close_index < return_index
+    assert "{{.State.Pid}}" in runtime_test
+    assert '[ "$state" = "exited 0 0" ]' in runtime_test