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import { prepareRequestBody } from "../src/routes/zen/util/requestBody"
describe("Zen request body streaming", () => {
test("patches the leading model without buffering the remaining body", async () => {
let reads = 0
const body = new ReadableStream<Uint8Array>(
{
pull(controller) {
const chunks = [
'{"model":"client-model","stream":true,"messages":[',
JSON.stringify({ role: "user", content: "large payload" }),
"]}",
]
const chunk = chunks[reads++]
if (chunk) controller.enqueue(new TextEncoder().encode(chunk))
else controller.close()
},
},
{ highWaterMark: 0 },
)
const request = await prepareRequestBody(body)
expect(request.model).toBe("client-model")
expect(reads).toBe(1)
const output = await new Response(request.stream("provider-model", false)).text()
expect(JSON.parse(output)).toEqual({
model: "provider-model",
stream: true,
messages: [{ role: "user", content: "large payload" }],
})
})
test("ignores model fields nested before the root model", async () => {
const body = new Blob([
'{"metadata":{"model":"ox-alpha-free"},"model":"glm-5.3","messages":[],"stream":false}',
]).stream()
const request = await prepareRequestBody(body)
expect(request.model).toBe("glm-5.3")
expect(JSON.parse(await new Response(request.stream("provider-model", false)).text())).toEqual({
metadata: { model: "ox-alpha-free" },
model: "provider-model",
messages: [],
stream: false,
})
})
test("appends stream usage options at the end of the request", async () => {
const body = new Blob(['{"model":"client-model","stream":true,"messages":[]} ']).stream()
const request = await prepareRequestBody(body)
const output = await new Response(request.stream("provider-model", true)).text()
expect(JSON.parse(output)).toEqual({
model: "provider-model",
stream: true,
messages: [],
stream_options: { include_usage: true },
})
expect(output.endsWith(" ")).toBe(true)
})
test("detects streaming after a large message while forwarding", async () => {
const content = "x".repeat(128 * 1024)
let reads = 0
const chunks = [
'{"model":"client-model","messages":[',
JSON.stringify({ role: "user", content }),
'],"stream":true}',
]
const body = new ReadableStream<Uint8Array>(
{
pull(controller) {
const chunk = chunks[reads++]
if (chunk) controller.enqueue(new TextEncoder().encode(chunk))
else controller.close()
},
},
{ highWaterMark: 0 },
)
const request = await prepareRequestBody(body)
expect(reads).toBe(1)
const output = await new Response(request.stream("provider-model", true)).text()
expect(JSON.parse(output)).toEqual({
model: "provider-model",
messages: [{ role: "user", content }],
stream: true,
stream_options: { include_usage: true },
})
})
test("buffers through a late model field and then streams the rest", async () => {
const content = "こんにちは".repeat(32 * 1024)
let reads = 0
const chunks = [
'{"messages":[',
JSON.stringify({ role: "user", content }),
'],"model":"client-model","stream":true,"extra":"after-model"}',
]
const body = new ReadableStream<Uint8Array>(
{
pull(controller) {
const chunk = chunks[reads++]
if (chunk) controller.enqueue(new TextEncoder().encode(chunk))
else controller.close()
},
},
{ highWaterMark: 0 },
)
const request = await prepareRequestBody(body)
expect(request.model).toBe("client-model")
expect(reads).toBe(3)
expect(JSON.parse(await new Response(request.stream("provider-model", true)).text())).toEqual({
messages: [{ role: "user", content }],
model: "provider-model",
stream: true,
extra: "after-model",
stream_options: { include_usage: true },
})
})
test("preserves a UTF-8 BOM while patching the model", async () => {
const body = new Blob(['\uFEFF{"messages":[],"model":"client-model","stream":false}']).stream()
const request = await prepareRequestBody(body)
const output = new Uint8Array(await new Response(request.stream("provider-model", false)).arrayBuffer())
expect([...output.subarray(0, 3)]).toEqual([0xef, 0xbb, 0xbf])
expect(JSON.parse(new TextDecoder().decode(output))).toEqual({
messages: [],
model: "provider-model",
stream: false,
})
})
})
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