test(core): Stop agents unit tests from fetching the model catalog (no-changelog) (#38592)

Co-authored-by: Claude Fable 5.1 <[email protected]>

packages/@n8n/agents/src/__tests__/setup.ts

@@ -0,0 +1,7 @@
+import { vi } from 'vitest';
+
+// Agent.build() looks up model cost on models.dev. Unit tests must not reach the network.
+vi.mock('../sdk/catalog', async (importOriginal) => {
+	const actual = await importOriginal<typeof import('../sdk/catalog')>();
+	return { ...actual, getModelCost: async () => undefined };
+});

packages/@n8n/agents/vite.config.ts

@@ -53,6 +53,7 @@ export default mergeConfig(
 	createVitestConfig({
 		// Integration tests run via vitest.integration.config.mjs (real providers, long timeouts).
 		exclude: [...configDefaults.exclude, '**/__tests__/integration/**'],
+		setupFiles: ['src/__tests__/setup.ts'],
 	}),
 	{
 		plugins: [rewriteSourceRequire()],