test: test async-hook triggerId properties

Add tests for checking the behavior of async_hooks.triggerId.
It should return different ids when called in callbacks having
different ancestry paths.
It should return the same id when called in callbacks having
the same ancestry path.

PR-URL: https://github.com/nodejs/node/pull/13328
Reviewed-By: Trevor Norris <trev.norris@gmail.com>
Reviewed-By: Andreas Madsen <amwebdk@gmail.com>

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');
+  });
+});