test: test async-hook triggerId invariant

test/parallel/test-async-wrap-trigger-id.js

@@ -0,0 +1,28 @@
+'use strict';
+require('../common');
+
+const assert = require('assert');
+const async_hooks = require('async_hooks');
+const triggerId = async_hooks.triggerId;
+
+const triggerId0 = triggerId();
+let triggerId1;
+
+process.nextTick(() => {
+  process.nextTick(() => {
+    triggerId1 = triggerId();
+    assert.notStrictEqual(
+      triggerId0,
+      triggerId1,
+      'Async resources having different causal ancestry ' +
+      'should have different triggerIds');
+  });
+  process.nextTick(() => {
+    const triggerId2 = triggerId();
+    assert.strictEqual(
+      triggerId1,
+      triggerId2,
+      'Async resources having the same causal ancestry ' +
+      'should have the same triggerId');
+  });
+});