test(good-fences): the model counts the rs in strawberry (red)

A first integration test of the model call: Workers AI through the AI
binding, behind the same `complete(messages)` interface as the sim's
fake model. Opt-in (`pnpm test:model`) since it needs `wrangler login`
and costs money.

Red: src/model.ts doesn't exist yet.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

good-fences/itest/model.test.ts

@@ -0,0 +1,16 @@
+/** @file The model, called for real through the Workers AI binding. */
+import { env } from "cloudflare:workers";
+import { expect, test } from "vitest";
+
+import { makeWorkersAiModel, MODEL } from "../src/model.ts";
+
+test("the model counts the rs in strawberry", async () => {
+	const model = makeWorkersAiModel(env.AI, MODEL);
+	const reply = await model.complete([
+		{
+			role: "user",
+			content: 'How many times does the letter r appear in "strawberry"? Answer with just the number.',
+		},
+	]);
+	expect(reply.trim()).toMatch(/^3\b/);
+});

good-fences/package.json

@@ -3,9 +3,16 @@
   "private": true,
   "type": "module",
   "scripts": {
-    "test": "node --test test/*.test.ts"
+    "test": "node --test test/*.test.ts",
+    "test:model": "vitest run -c vitest.model.config.ts",
+    "types": "wrangler types -c wrangler.model-tests.jsonc"
   },
   "dependencies": {
     "ses": "^1.14.0"
+  },
+  "devDependencies": {
+    "@cloudflare/vitest-plugin": "1.3.6",
+    "vitest": "4.1.11",
+    "wrangler": "^4.148.0"
   }
 }

good-fences/vitest.model.config.ts

@@ -0,0 +1,8 @@
+import { defineProject } from "vitest/config";
+import { cloudflareTest } from "@cloudflare/vitest-plugin";
+
+/** opt-in (`pnpm test:model`): calls Workers AI, which needs `wrangler login` and costs money */
+export default defineProject({
+	plugins: [cloudflareTest({ wrangler: { configPath: "./wrangler.model-tests.jsonc" } })],
+	test: { include: ["itest/**/*.test.ts"] },
+});

good-fences/wrangler.model-tests.jsonc

@@ -0,0 +1,7 @@
+{
+	"$schema": "node_modules/wrangler/config-schema.json",
+	// model integration tests: AI always runs remotely, and costs money
+	"name": "good-fences-model-tests",
+	"compatibility_date": "2026-10-01",
+	"ai": { "binding": "AI", "remote": true }
+}