before functional changes by codex

test/basic/register-child.basic.test.js

@@ -0,0 +1,39 @@
+const test = require('node:test');
+const assert = require('node:assert/strict');
+
+const NodeClass = require('../../src/nodeClass');
+const { makeNodeStub } = require('../helpers/factories');
+
+test('_registerChild emits delayed registration message on output 2', () => {
+  const inst = Object.create(NodeClass.prototype);
+  const node = makeNodeStub();
+
+  inst.node = node;
+  inst.config = {
+    functionality: {
+      positionVsParent: 'downstream',
+    },
+  };
+
+  const originalSetTimeout = global.setTimeout;
+  const delays = [];
+
+  global.setTimeout = (fn, ms) => {
+    delays.push(ms);
+    fn();
+    return 1;
+  };
+
+  try {
+    inst._registerChild();
+  } finally {
+    global.setTimeout = originalSetTimeout;
+  }
+
+  assert.deepEqual(delays, [100]);
+  assert.equal(node._sent.length, 1);
+  assert.equal(Array.isArray(node._sent[0]), true);
+  assert.equal(node._sent[0][2].topic, 'registerChild');
+  assert.equal(node._sent[0][2].payload, node.id);
+  assert.equal(node._sent[0][2].positionVsParent, 'downstream');
+});