swarm-ui: the badge tooltips are built by a tested helper

frontend/packages/swarm-ui/test/badge-titles.test.mjs

@@ -0,0 +1,27 @@
+// The model and effort badge tooltips. Run by `npm test`, which Node runs with
+// its built-in test runner and type stripping.
+import assert from "node:assert/strict";
+import { test } from "node:test";
+import { effortTitle, modelTitle } from "../src/agent/state/badge-titles.ts";
+
+test("a plain model badge says what the alias resolved to, or nothing", () => {
+  assert.equal(modelTitle("claude-x-1", false), "resolved to claude-x-1");
+  assert.equal(modelTitle(undefined, false), undefined);
+  assert.equal(modelTitle("", false), undefined);
+});
+
+test("a clickable model badge says it opens the settings", () => {
+  assert.equal(
+    modelTitle("claude-x-1", true),
+    "resolved to claude-x-1. Click for the inference settings",
+  );
+  assert.equal(modelTitle(undefined, true), "Click for the inference settings");
+});
+
+test("the effort badge names its source and, when clickable, the click", () => {
+  assert.equal(effortTitle("swarm", false), "set by: swarm");
+  assert.equal(
+    effortTitle("swarm", true),
+    "set by: swarm. Click for the inference settings",
+  );
+});