Use .toHaveNthReturnedWith to test the specific value that a mock object returned for the nth call

import { expect, fn, test } from "https://deno.land/x/unitest@$VERSION/mod.ts";

test("passes when mock object of last returned with", () => {
  const mockObject = fn((a: number, b: number) => a + b);
  mockObject(1, 2);
  mockObject(3, 4);
  expect(mockObject).toHaveNthReturnedWith(1, 3);
  expect(mockObject).toHaveNthReturnedWith(2, 7);
});