fix: add nodes default-node regression test (#27444) (thanks @carbaj03)

src/agents/tools/nodes-utils.test.ts

@@ -0,0 +1,32 @@
+import { describe, expect, it } from "vitest";
+import type { NodeListNode } from "./nodes-utils.js";
+import { resolveNodeIdFromList } from "./nodes-utils.js";
+
+function node(overrides: Partial<NodeListNode> & { nodeId: string }): NodeListNode {
+  return {
+    nodeId: overrides.nodeId,
+    caps: ["canvas"],
+    connected: true,
+    ...overrides,
+  };
+}
+
+describe("resolveNodeIdFromList defaults", () => {
+  it("falls back to first connected canvas-capable node when multiple non-Mac candidates exist", () => {
+    const nodes: NodeListNode[] = [
+      node({ nodeId: "ios-1", platform: "ios" }),
+      node({ nodeId: "android-1", platform: "android" }),
+    ];
+
+    expect(resolveNodeIdFromList(nodes, undefined, true)).toBe("ios-1");
+  });
+
+  it("preserves local Mac preference when exactly one local Mac candidate exists", () => {
+    const nodes: NodeListNode[] = [
+      node({ nodeId: "ios-1", platform: "ios" }),
+      node({ nodeId: "mac-1", platform: "macos" }),
+    ];
+
+    expect(resolveNodeIdFromList(nodes, undefined, true)).toBe("mac-1");
+  });
+});