Question

我的lib / gcd.js

function gcd(a, b) {
    if (!a) return b;
    if (!b) return a;

    while (1) {
      a%= b;
      if (!a) return b;
      b%= a;
      if (!b) return a;
    }
}

module.exports = gcd;

我的测试/ gcd.test.js

const { gcd } = require("../lib");

describe("gcd", () => {
  test("Basic: gcd of 54 and 24 is 6", () => {
    expect(gcd(54, 24)).toBe(6);
  });

  test("Large Numbers: gcd of 123456 and 9876 is 12", () => {
    expect(gcd(123456, 9876)).toBe(12);
  });

  test("1 Negative: gcd of 54 and -24 is 6", () => {
    expect(gcd(54, -24)).toBe(6);
  });

  test("2 Negative: gcd of -54 and -24 is 6", () => {
    expect(gcd(-54, -24)).toBe(6);
  });

  test("gcd of 0 and 1 should throw error", () => {
    expect(() => {
      gcd(0, 1);
    }).toThrow();
  });
});

当我使用jest运行测试时出现此错误说： TypeError：gcd不是函数

我能知道出了什么问题，是否与gcd功能有关？

Answer 1

应该是这样的：

const gcd = require("../lib/gcd.js");

describe("gcd", () => {
  test("Basic: gcd of 54 and 24 is 6", () => {
    expect(gcd(54, 24)).toBe(6);
  });

  test("Large Numbers: gcd of 123456 and 9876 is 12", () => {
    expect(gcd(123456, 9876)).toBe(12);
  });

  test("1 Negative: gcd of 54 and -24 is 6", () => {
    expect(gcd(54, -24)).toBe(6);
  });

  test("2 Negative: gcd of -54 and -24 is 6", () => {
    expect(gcd(-54, -24)).toBe(6);
  });

  test("gcd of 0 and 1 should throw error", () => {
    expect(() => {
      gcd(0, 1);
    }).toThrow();
  });
});

TypeError：gcd不是函数

1 个答案: