before functional changes by codex

test/edge/invalid-payload.edge.test.js

@@ -0,0 +1,28 @@
+const test = require('node:test');
+const assert = require('node:assert/strict');
+
+const NodeClass = require('../../src/nodeClass');
+const { makeNodeStub, makeREDStub } = require('../helpers/factories');
+
+test('measurement topic ignores non-number payloads (current behavior)', () => {
+  const inst = Object.create(NodeClass.prototype);
+  const node = makeNodeStub();
+  const calls = [];
+
+  inst.node = node;
+  inst.RED = makeREDStub();
+  inst.source = {
+    set inputValue(v) { calls.push(v); },
+    toggleSimulation() {},
+    toggleOutlierDetection() {},
+    calibrate() {},
+  };
+
+  inst._attachInputHandler();
+  const onInput = node._handlers.input;
+
+  onInput({ topic: 'measurement', payload: '42' }, () => {}, () => {});
+  onInput({ topic: 'measurement', payload: { value: 42 } }, () => {}, () => {});
+
+  assert.equal(calls.length, 0);
+});