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type Handler = (req: any, res: any) => void | Promise<void> export class FakeExpressApp { routes: Record<string, { method: 'GET'|'POST'; handler: Handler }> = {} use(_arg: any): void { /* ignore middleware */ } get(path: string, handler: Handler): void { this.routes[`GET ${path}`] = { method: 'GET', handler } } post(path: string, handler: Handler): void { this.routes[`POST ${path}`] = { method: 'POST', handler } } async invoke(method: 'GET'|'POST', path: string, options?: { query?: Record<string,string>, headers?: Record<string,string>, body?: any }) { const key = `${method} ${path}` const route = this.routes[key] if (!route) throw new Error(`Route not found: ${key}`) const req = { method, query: options?.query ?? {}, headers: options?.headers ?? {}, body: options?.body ?? undefined, protocol: 'http', get: (h: string) => (options?.headers?.[h.toLowerCase()] ?? options?.headers?.[h] ?? undefined), } let statusCode = 200 let sentHeaders: Record<string,string> = {} let payload: any const res = { set: (k: string, v: string) => { sentHeaders[k.toLowerCase()] = v }, status: (c: number) => { statusCode = c; return res }, send: (b: any) => { payload = b }, json: (b: any) => { sentHeaders['content-type'] = 'application/json'; payload = JSON.stringify(b) }, redirect: (loc: string) => { statusCode = 302; sentHeaders['location'] = loc; payload = '' }, } await route.handler(req, res) return { status: statusCode, headers: sentHeaders, body: payload } } }