713 lines
26 KiB
TypeScript
713 lines
26 KiB
TypeScript
/**
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* Unit tests for OpenAIWebSocketManager
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*
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* Uses a mock WebSocket implementation to avoid real network calls.
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* The mock simulates the ws package's EventEmitter-based API.
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*/
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import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
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import type {
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ClientEvent,
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OpenAIWebSocketEvent,
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ResponseCompletedEvent,
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ResponseCreateEvent,
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} from "./openai-ws-connection.js";
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import { OpenAIWebSocketManager } from "./openai-ws-connection.js";
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// ─────────────────────────────────────────────────────────────────────────────
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// Mock WebSocket (hoisted so vi.mock factory can reference it)
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// ─────────────────────────────────────────────────────────────────────────────
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// vi.mock() factories are hoisted before ES module imports are resolved.
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// vi.hoisted() allows us to define values that are available to both the
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// factory AND the test body. We avoid importing EventEmitter here because
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// ESM imports aren't available yet in the hoisted zone — instead we
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// implement a minimal listener pattern inline.
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const { MockWebSocket } = vi.hoisted(() => {
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type AnyFn = (...args: unknown[]) => void;
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class MockWebSocket {
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static CONNECTING = 0;
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static OPEN = 1;
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static CLOSING = 2;
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static CLOSED = 3;
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readyState: number = MockWebSocket.CONNECTING;
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url: string;
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options: Record<string, unknown>;
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sentMessages: string[] = [];
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private _listeners: Map<string, AnyFn[]> = new Map();
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constructor(url: string, options?: Record<string, unknown>) {
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this.url = url;
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this.options = options ?? {};
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MockWebSocket.lastInstance = this;
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MockWebSocket.instances.push(this);
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}
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// Minimal EventEmitter-compatible interface
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on(event: string, fn: AnyFn): this {
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const list = this._listeners.get(event) ?? [];
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list.push(fn);
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this._listeners.set(event, list);
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return this;
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}
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once(event: string, fn: AnyFn): this {
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const wrapper = (...args: unknown[]) => {
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this.off(event, wrapper);
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fn(...args);
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};
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return this.on(event, wrapper);
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}
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off(event: string, fn: AnyFn): this {
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const list = this._listeners.get(event) ?? [];
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this._listeners.set(
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event,
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list.filter((l) => l !== fn),
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);
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return this;
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}
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removeAllListeners(event?: string): this {
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if (event !== undefined) {
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this._listeners.delete(event);
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} else {
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this._listeners.clear();
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}
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return this;
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}
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emit(event: string, ...args: unknown[]): boolean {
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const list = this._listeners.get(event) ?? [];
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for (const fn of list) {
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fn(...args);
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}
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return list.length > 0;
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}
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// ws-compatible send
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send(data: string): void {
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this.sentMessages.push(data);
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}
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// ws-compatible close — triggers async close event
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close(code = 1000, reason = ""): void {
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this.readyState = MockWebSocket.CLOSING;
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setImmediate(() => {
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this.readyState = MockWebSocket.CLOSED;
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this.emit("close", code, Buffer.from(reason));
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});
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}
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// ── Test helpers ──────────────────────────────────────────────────────
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simulateOpen(): void {
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this.readyState = MockWebSocket.OPEN;
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this.emit("open");
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}
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simulateMessage(event: unknown): void {
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this.emit("message", Buffer.from(JSON.stringify(event)));
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}
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simulateError(err: Error): void {
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this.readyState = MockWebSocket.CLOSED;
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this.emit("error", err);
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}
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simulateClose(code = 1006, reason = "Connection lost"): void {
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this.readyState = MockWebSocket.CLOSED;
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this.emit("close", code, Buffer.from(reason));
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}
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static lastInstance: MockWebSocket | null = null;
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static instances: MockWebSocket[] = [];
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static reset(): void {
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MockWebSocket.lastInstance = null;
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MockWebSocket.instances = [];
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}
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}
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return { MockWebSocket };
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});
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// ─────────────────────────────────────────────────────────────────────────────
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// Module Mock
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// ─────────────────────────────────────────────────────────────────────────────
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vi.mock("ws", () => {
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// ws exports WebSocket as the default export; static constants (OPEN, etc.)
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// live on the class itself.
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return { default: MockWebSocket };
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});
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// ─────────────────────────────────────────────────────────────────────────────
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// Type alias for the mock class (improves test readability)
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// ─────────────────────────────────────────────────────────────────────────────
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type MockWS = typeof MockWebSocket extends { new (...a: infer _): infer R } ? R : never;
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// ─────────────────────────────────────────────────────────────────────────────
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// Helpers
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// ─────────────────────────────────────────────────────────────────────────────
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function lastSocket(): MockWS {
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const sock = MockWebSocket.lastInstance;
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if (!sock) {
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throw new Error("No MockWebSocket instance created");
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}
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return sock;
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}
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function buildManager(opts?: ConstructorParameters<typeof OpenAIWebSocketManager>[0]) {
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return new OpenAIWebSocketManager({
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// Use faster backoff in tests to avoid slow timer waits
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backoffDelaysMs: [10, 20, 40, 80, 160],
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...opts,
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});
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}
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// ─────────────────────────────────────────────────────────────────────────────
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// Tests
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// ─────────────────────────────────────────────────────────────────────────────
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describe("OpenAIWebSocketManager", () => {
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beforeEach(() => {
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MockWebSocket.reset();
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vi.useFakeTimers();
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});
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afterEach(() => {
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vi.useRealTimers();
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});
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// ─── connect() ─────────────────────────────────────────────────────────────
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describe("connect()", () => {
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it("opens a WebSocket with Bearer auth header", async () => {
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const manager = buildManager();
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const connectPromise = manager.connect("sk-test-key");
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const sock = lastSocket();
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expect(sock.url).toBe("wss://api.openai.com/v1/responses");
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expect(sock.options).toMatchObject({
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headers: expect.objectContaining({
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Authorization: "Bearer sk-test-key",
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}),
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});
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sock.simulateOpen();
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await connectPromise;
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});
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it("resolves when the connection opens", async () => {
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const manager = buildManager();
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const connectPromise = manager.connect("sk-test");
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lastSocket().simulateOpen();
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await expect(connectPromise).resolves.toBeUndefined();
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});
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it("rejects when the initial connection fails (maxRetries=0)", async () => {
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const manager = buildManager({ maxRetries: 0 });
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const connectPromise = manager.connect("sk-test");
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lastSocket().simulateError(new Error("ECONNREFUSED"));
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await expect(connectPromise).rejects.toThrow("ECONNREFUSED");
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});
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it("sets isConnected() to true after open", async () => {
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const manager = buildManager();
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expect(manager.isConnected()).toBe(false);
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const connectPromise = manager.connect("sk-test");
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lastSocket().simulateOpen();
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await connectPromise;
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expect(manager.isConnected()).toBe(true);
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});
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it("uses the custom URL when provided", async () => {
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const manager = buildManager({ url: "ws://localhost:9999/v1/responses" });
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const connectPromise = manager.connect("sk-test");
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expect(lastSocket().url).toBe("ws://localhost:9999/v1/responses");
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lastSocket().simulateOpen();
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await connectPromise;
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});
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});
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// ─── send() ────────────────────────────────────────────────────────────────
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describe("send()", () => {
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it("sends a JSON-serialized event over the socket", async () => {
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const manager = buildManager();
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const connectPromise = manager.connect("sk-test");
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const sock = lastSocket();
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sock.simulateOpen();
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await connectPromise;
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const event: ResponseCreateEvent = {
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type: "response.create",
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model: "gpt-5.2",
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input: [{ type: "message", role: "user", content: "Hello" }],
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};
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manager.send(event);
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expect(sock.sentMessages).toHaveLength(1);
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expect(JSON.parse(sock.sentMessages[0] ?? "{}")).toEqual(event);
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});
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it("throws if the connection is not open", () => {
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const manager = buildManager();
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const event: ClientEvent = {
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type: "response.create",
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model: "gpt-5.2",
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};
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expect(() => manager.send(event)).toThrow(/cannot send/);
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});
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it("includes previous_response_id when provided", async () => {
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const manager = buildManager();
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const connectPromise = manager.connect("sk-test");
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const sock = lastSocket();
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sock.simulateOpen();
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await connectPromise;
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const event: ResponseCreateEvent = {
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type: "response.create",
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model: "gpt-5.2",
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previous_response_id: "resp_abc123",
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input: [{ type: "function_call_output", call_id: "call_1", output: "result" }],
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};
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manager.send(event);
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const sent = JSON.parse(sock.sentMessages[0] ?? "{}") as ResponseCreateEvent;
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expect(sent.previous_response_id).toBe("resp_abc123");
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});
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});
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// ─── onMessage() ───────────────────────────────────────────────────────────
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describe("onMessage()", () => {
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it("calls handler for each incoming message", async () => {
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const manager = buildManager();
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const connectPromise = manager.connect("sk-test");
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const sock = lastSocket();
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sock.simulateOpen();
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await connectPromise;
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const received: OpenAIWebSocketEvent[] = [];
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manager.onMessage((e) => received.push(e));
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const deltaEvent: OpenAIWebSocketEvent = {
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type: "response.output_text.delta",
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item_id: "item_1",
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output_index: 0,
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content_index: 0,
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delta: "Hello",
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};
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sock.simulateMessage(deltaEvent);
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expect(received).toHaveLength(1);
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expect(received[0]).toEqual(deltaEvent);
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});
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it("returns an unsubscribe function that stops delivery", async () => {
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const manager = buildManager();
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const connectPromise = manager.connect("sk-test");
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const sock = lastSocket();
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sock.simulateOpen();
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await connectPromise;
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const received: OpenAIWebSocketEvent[] = [];
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const unsubscribe = manager.onMessage((e) => received.push(e));
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sock.simulateMessage({ type: "response.in_progress", response: makeResponse("r1") });
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unsubscribe();
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sock.simulateMessage({ type: "response.in_progress", response: makeResponse("r2") });
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expect(received).toHaveLength(1);
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});
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it("supports multiple simultaneous handlers", async () => {
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const manager = buildManager();
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const connectPromise = manager.connect("sk-test");
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const sock = lastSocket();
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sock.simulateOpen();
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await connectPromise;
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const calls: number[] = [];
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manager.onMessage(() => calls.push(1));
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manager.onMessage(() => calls.push(2));
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sock.simulateMessage({ type: "response.in_progress", response: makeResponse("r1") });
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expect(calls.toSorted((a, b) => a - b)).toEqual([1, 2]);
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});
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});
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// ─── previousResponseId ────────────────────────────────────────────────────
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describe("previousResponseId", () => {
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it("starts as null", () => {
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expect(new OpenAIWebSocketManager().previousResponseId).toBeNull();
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});
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it("is updated when a response.completed event is received", async () => {
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const manager = buildManager();
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const connectPromise = manager.connect("sk-test");
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const sock = lastSocket();
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sock.simulateOpen();
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await connectPromise;
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const completedEvent: ResponseCompletedEvent = {
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type: "response.completed",
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response: makeResponse("resp_done_42", "completed"),
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};
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sock.simulateMessage(completedEvent);
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expect(manager.previousResponseId).toBe("resp_done_42");
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});
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it("tracks the most recent completed response", async () => {
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const manager = buildManager();
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const connectPromise = manager.connect("sk-test");
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const sock = lastSocket();
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sock.simulateOpen();
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await connectPromise;
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sock.simulateMessage({
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type: "response.completed",
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response: makeResponse("resp_1", "completed"),
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});
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sock.simulateMessage({
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type: "response.completed",
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response: makeResponse("resp_2", "completed"),
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});
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expect(manager.previousResponseId).toBe("resp_2");
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});
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it("is not updated for non-completed events", async () => {
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const manager = buildManager();
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const connectPromise = manager.connect("sk-test");
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const sock = lastSocket();
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sock.simulateOpen();
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await connectPromise;
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sock.simulateMessage({ type: "response.in_progress", response: makeResponse("resp_x") });
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expect(manager.previousResponseId).toBeNull();
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});
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});
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// ─── isConnected() ─────────────────────────────────────────────────────────
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describe("isConnected()", () => {
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it("returns false before connect", () => {
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expect(buildManager().isConnected()).toBe(false);
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});
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it("returns true while open", async () => {
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const manager = buildManager();
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const p = manager.connect("sk-test");
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lastSocket().simulateOpen();
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await p;
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expect(manager.isConnected()).toBe(true);
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});
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it("returns false after close()", async () => {
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const manager = buildManager();
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const p = manager.connect("sk-test");
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lastSocket().simulateOpen();
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await p;
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manager.close();
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expect(manager.isConnected()).toBe(false);
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});
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});
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// ─── close() ───────────────────────────────────────────────────────────────
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describe("close()", () => {
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it("marks the manager as disconnected", async () => {
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const manager = buildManager();
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const p = manager.connect("sk-test");
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lastSocket().simulateOpen();
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await p;
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manager.close();
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expect(manager.isConnected()).toBe(false);
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});
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it("prevents reconnect after explicit close", async () => {
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const manager = buildManager();
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const p = manager.connect("sk-test");
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const sock = lastSocket();
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sock.simulateOpen();
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await p;
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const socketCountBefore = MockWebSocket.instances.length;
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manager.close();
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// Simulate a network drop — should NOT trigger reconnect
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sock.simulateClose(1006, "Network error");
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await vi.runAllTimersAsync();
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expect(MockWebSocket.instances.length).toBe(socketCountBefore);
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});
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it("is safe to call before connect()", () => {
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const manager = buildManager();
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expect(() => manager.close()).not.toThrow();
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});
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});
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// ─── Auto-reconnect ────────────────────────────────────────────────────────
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describe("auto-reconnect", () => {
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it("reconnects on unexpected close", async () => {
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const manager = buildManager({ backoffDelaysMs: [10, 20, 40, 80, 160] });
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const p = manager.connect("sk-test");
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lastSocket().simulateOpen();
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await p;
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const sock1 = lastSocket();
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const instancesBefore = MockWebSocket.instances.length;
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// Simulate a network drop
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sock1.simulateClose(1006, "Network error");
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// Advance time to trigger first retry (10ms delay)
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await vi.advanceTimersByTimeAsync(15);
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// A new socket should have been created
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expect(MockWebSocket.instances.length).toBeGreaterThan(instancesBefore);
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expect(lastSocket()).not.toBe(sock1);
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});
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it("stops retrying after maxRetries", async () => {
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const manager = buildManager({ maxRetries: 2, backoffDelaysMs: [5, 5] });
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const p = manager.connect("sk-test");
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lastSocket().simulateOpen();
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await p;
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const errors: Error[] = [];
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manager.on("error", (e) => errors.push(e));
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// Drop repeatedly — each reconnect attempt also drops immediately
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for (let i = 0; i < 4; i++) {
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lastSocket().simulateClose(1006, "drop");
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await vi.advanceTimersByTimeAsync(20);
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}
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const maxRetryError = errors.find((e) => e.message.includes("max reconnect retries"));
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expect(maxRetryError).toBeDefined();
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});
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it("resets retry count after a successful reconnect", async () => {
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const manager = buildManager({ maxRetries: 3, backoffDelaysMs: [5, 10, 20] });
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const p = manager.connect("sk-test");
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lastSocket().simulateOpen();
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await p;
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// Drop and let first retry succeed
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lastSocket().simulateClose(1006, "drop");
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await vi.advanceTimersByTimeAsync(10);
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lastSocket().simulateOpen(); // second socket opens successfully
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const socketCountAfterReconnect = MockWebSocket.instances.length;
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// Drop again — should still retry (retry count was reset)
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lastSocket().simulateClose(1006, "drop again");
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await vi.advanceTimersByTimeAsync(10);
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expect(MockWebSocket.instances.length).toBeGreaterThan(socketCountAfterReconnect);
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});
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});
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// ─── warmUp() ──────────────────────────────────────────────────────────────
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describe("warmUp()", () => {
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it("sends a response.create event with generate: false", async () => {
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const manager = buildManager();
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const p = manager.connect("sk-test");
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const sock = lastSocket();
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sock.simulateOpen();
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await p;
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manager.warmUp({ model: "gpt-5.2", instructions: "You are helpful." });
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expect(sock.sentMessages).toHaveLength(1);
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const sent = JSON.parse(sock.sentMessages[0] ?? "{}") as Record<string, unknown>;
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expect(sent["type"]).toBe("response.create");
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expect(sent["generate"]).toBe(false);
|
|
expect(sent["model"]).toBe("gpt-5.2");
|
|
expect(sent["instructions"]).toBe("You are helpful.");
|
|
});
|
|
|
|
it("includes tools when provided", async () => {
|
|
const manager = buildManager();
|
|
const p = manager.connect("sk-test");
|
|
const sock = lastSocket();
|
|
sock.simulateOpen();
|
|
await p;
|
|
|
|
manager.warmUp({
|
|
model: "gpt-5.2",
|
|
tools: [{ type: "function", function: { name: "exec", description: "Run a command" } }],
|
|
});
|
|
|
|
const sent = JSON.parse(sock.sentMessages[0] ?? "{}") as Record<string, unknown>;
|
|
expect(sent["tools"]).toHaveLength(1);
|
|
expect((sent["tools"] as Array<{ function?: { name?: string } }>)[0]?.function?.name).toBe(
|
|
"exec",
|
|
);
|
|
});
|
|
});
|
|
|
|
// ─── Error handling ─────────────────────────────────────────────────────────
|
|
|
|
describe("error handling", () => {
|
|
it("emits error event on malformed JSON message", async () => {
|
|
const manager = buildManager();
|
|
const p = manager.connect("sk-test");
|
|
const sock = lastSocket();
|
|
sock.simulateOpen();
|
|
await p;
|
|
|
|
const errors: Error[] = [];
|
|
manager.on("error", (e) => errors.push(e));
|
|
|
|
sock.emit("message", Buffer.from("not valid json{{{{"));
|
|
|
|
expect(errors).toHaveLength(1);
|
|
expect(errors[0]?.message).toContain("failed to parse message");
|
|
});
|
|
|
|
it("emits error event when message has no type field", async () => {
|
|
const manager = buildManager();
|
|
const p = manager.connect("sk-test");
|
|
const sock = lastSocket();
|
|
sock.simulateOpen();
|
|
await p;
|
|
|
|
const errors: Error[] = [];
|
|
manager.on("error", (e) => errors.push(e));
|
|
|
|
sock.emit("message", Buffer.from(JSON.stringify({ foo: "bar" })));
|
|
|
|
expect(errors).toHaveLength(1);
|
|
expect(errors[0]?.message).toContain('no "type" field');
|
|
});
|
|
|
|
it("emits error event on WebSocket socket error", async () => {
|
|
const manager = buildManager({ maxRetries: 0 });
|
|
const p = manager.connect("sk-test").catch(() => {
|
|
/* ignore rejection */
|
|
});
|
|
|
|
const errors: Error[] = [];
|
|
manager.on("error", (e) => errors.push(e));
|
|
|
|
lastSocket().simulateError(new Error("SSL handshake failed"));
|
|
await p;
|
|
|
|
expect(errors.some((e) => e.message === "SSL handshake failed")).toBe(true);
|
|
});
|
|
|
|
it("handles multiple successive socket errors without crashing", async () => {
|
|
const manager = buildManager({ maxRetries: 0 });
|
|
const p = manager.connect("sk-test").catch(() => {
|
|
/* ignore rejection */
|
|
});
|
|
|
|
const errors: Error[] = [];
|
|
manager.on("error", (e) => errors.push(e));
|
|
|
|
// Fire two errors in quick succession — previously the second would
|
|
// be unhandled because .once("error") removed the handler after #1.
|
|
lastSocket().simulateError(new Error("first error"));
|
|
lastSocket().simulateError(new Error("second error"));
|
|
await p;
|
|
|
|
expect(errors.length).toBeGreaterThanOrEqual(2);
|
|
expect(errors.some((e) => e.message === "first error")).toBe(true);
|
|
expect(errors.some((e) => e.message === "second error")).toBe(true);
|
|
});
|
|
});
|
|
|
|
// ─── Integration: full multi-turn sequence ────────────────────────────────
|
|
|
|
describe("full turn sequence", () => {
|
|
it("tracks previous_response_id across turns and sends continuation correctly", async () => {
|
|
const manager = buildManager();
|
|
const p = manager.connect("sk-test");
|
|
const sock = lastSocket();
|
|
sock.simulateOpen();
|
|
await p;
|
|
|
|
const received: OpenAIWebSocketEvent[] = [];
|
|
manager.onMessage((e) => received.push(e));
|
|
|
|
// Send initial turn
|
|
manager.send({ type: "response.create", model: "gpt-5.2", input: "Hello" });
|
|
|
|
// Simulate streaming events from server
|
|
sock.simulateMessage({ type: "response.created", response: makeResponse("resp_1") });
|
|
sock.simulateMessage({
|
|
type: "response.output_text.delta",
|
|
item_id: "i1",
|
|
output_index: 0,
|
|
content_index: 0,
|
|
delta: "Hi!",
|
|
});
|
|
sock.simulateMessage({
|
|
type: "response.completed",
|
|
response: makeResponse("resp_1", "completed"),
|
|
});
|
|
|
|
expect(manager.previousResponseId).toBe("resp_1");
|
|
expect(received).toHaveLength(3);
|
|
|
|
// Send continuation turn using the tracked previous_response_id
|
|
manager.send({
|
|
type: "response.create",
|
|
model: "gpt-5.2",
|
|
previous_response_id: manager.previousResponseId!,
|
|
input: [{ type: "function_call_output", call_id: "call_99", output: "tool result" }],
|
|
});
|
|
|
|
const lastSent = JSON.parse(sock.sentMessages[1] ?? "{}") as ResponseCreateEvent;
|
|
expect(lastSent.previous_response_id).toBe("resp_1");
|
|
expect(lastSent.input).toEqual([
|
|
{ type: "function_call_output", call_id: "call_99", output: "tool result" },
|
|
]);
|
|
});
|
|
});
|
|
});
|
|
|
|
// ─────────────────────────────────────────────────────────────────────────────
|
|
// Test Fixtures
|
|
// ─────────────────────────────────────────────────────────────────────────────
|
|
|
|
function makeResponse(
|
|
id: string,
|
|
status: ResponseCompletedEvent["response"]["status"] = "in_progress",
|
|
): ResponseCompletedEvent["response"] {
|
|
return {
|
|
id,
|
|
object: "response",
|
|
created_at: Date.now(),
|
|
status,
|
|
model: "gpt-5.2",
|
|
output: [],
|
|
usage: { input_tokens: 10, output_tokens: 5, total_tokens: 15 },
|
|
};
|
|
}
|