3-by-reference.test

({
  name: 'inc',
  length: [20, 70],
  cases: [
    [{ n: 0 }, undefined],
    [{ n: 1 }, undefined],
    [{ n: -1 }, undefined],
    [{ n: 10000 }, undefined],
  ],
  test: (inc) => {
    const arg = { n: 5 };
    const result = inc(arg);
    if (typeof result !== 'undefined') {
      throw new Error('Result should be undefined');
    }
    if (arg.n !== 6) {
      const res = JSON.stringify(arg);
      throw new Error(`Case failed: expected {"n":6}, result: ${res}`);
    }
  },
})