}

return JSON.parse(init.body) as unknown;

};

// The model fetch/load helpers now read bodies through the shared byte-capped

// reader, so success-path mocks must be real Response objects with a body

// stream rather than bare `{ ok, json }` placeholders.

const jsonResponse = (payload: unknown, init?: ResponseInit): Response =>

new Response(JSON.stringify(payload), {

status: 200,

headers: { "content-type": "application/json" },

...init,

});

const malformedJsonResponse = (init?: ResponseInit): Response =>

new Response("{ this is not valid json", {

status: 200,

headers: { "content-type": "application/json" },

...init,

});

const cancelTrackedResponse = (

text: string,

init: ResponseInit,

}) =>

vi.fn(async (url: string | URL, _init?: RequestInit) => {

const key = params?.key ?? "qwen3-8b-instruct";

void init;

if (String(url).endsWith("/api/v1/models")) {

return jsonResponse({

models: [