How to get a TRPCClientError shape as in initTRPC errorFormatter for testing

const t = initTRPC.context<typeof createTRPCContext>().create({
  transformer: superjson,
  errorFormatter({ error, shape }) {
    return {
      ...shape,
      data: {
        ...shape.data,
        zodError:
          error.cause instanceof ZodError ? error.cause.flatten() : null,
        apiError: ApiError.isApiError(error.cause) ? error.cause.errors : [],
        errorStatuses: [
          shape.data.httpStatus,
          ApiError.isApiError(error.cause) ? error.cause.status : undefined,
        ],
      },
    };
  },
});

export const onFormApiError =  (error: unknown) => {
    if (!isTRPCClientError(error)) return; // should never trigger

    // HOW DO I SETUP THE ERROR IN TEST WITH THIS SHAPE
    const errors = error?.data?.apiError || [];
  ....
}

it('test test', () => {
      // WHAT DO I PASS HERE AS PROPER ERRROR with the shape??
    onFormApiError(new TRPCClientError('test3', { data: { apiError: [] } }));

  });