Function macro

src/test/testlib.ts:283–287

(testInterface: ExecutionContext<Context>, ...args: Args)

      | ((t: ExecutionContext<Context>) => Promise<void>)
  ) {
    function macro(testInterface: ExecutionContext<Context>, ...args: Args) {
      const ret = cb(...args);
      const macroFunction = Array.isArray(ret) ? ret[1] : ret;
      return macroFunction(testInterface);
    }
    macro.title = function (givenTitle: string | undefined, ...args: Args) {
      const ret = cb(...args);
      return Array.isArray(ret)