javascript - 为什么我的 Javascript 代码没有通过 chai 中的单元测试用例

Question

java脚本中星形代码金字塔失败的测试用例

我的输出与用 Mocha 编写的测试用例不匹配。可能是\n 字符有问题。

const buildPyramid = (num) => {
  var stars = '';
  for (var i = 1; i <= num; i++) {
    for (var k = 1; k <= num - i + 1; k++) {
      stars += ' ';
    }
    for (var j = 1; j <= i; j++) {
      stars += '* ';
    }
    console.log(stars + '\n');
    stars = '';
  }


};

---

我的测试用例:

const chai = require('chai');
const expect = chai.expect;
const pyramid = require('../solutions/q1_pyramid_of_stars.js');

describe('Testing - pyramid_of_stars', () => {
  it('module return type test case', (done) => {
    expect(typeof pyramid).to.deep.equal('function');
    done();
  });

  it('positive test case for odd count of height', (done) => {
    expect(pyramid(5)).equal(
      '     *  \n    * *  \n   * * *  \n  * * * *  \n * * * * *  \n');
    done();
  });

  it('positive test case for even count of height', (done) => {
    expect(pyramid(6)).equal(
      '      *  \n     * *  \n    * * *  \n   * * * *  \n  * * * * *  \n * * * * * *  \n');
    done();
  });

  it('negative test case', (done) => {
    expect(pyramid('invalid value')).to.deep.equal('');
    done();
  });
});

错误:1) 测试 - pyramid_of_stars 奇数高度的正测试用例: AssertionError: 预期未定义等于 ' *\n * *\n * * *\n * * * *\n * * * * *\n' 在 Context.it (test\q1_pyramid_of_stars.spec.js:12:22)

2) 测试 - pyramid_of_stars 偶数高度的正面测试用例: AssertionError:预期未定义等于' *\n * *\n * * *\n * * * *\n * * * * *\n * * * * * *\n' 在 Context.it (test\q1_pyramid_of_stars.spec.js:18:22)

3) 测试 - pyramid_of_stars 负测试用例: AssertionError:预期未定义深度等于'' 在 Context.it (test\q1_pyramid_of_stars.spec.js:24:44)

Answer 1

您的代码工作正常，您的测试也是如此。这里的问题是您的 buildPyramid 函数总是返回 undefined 因为您只是使用 console.log 来输出结果。

试着把它改成这样

const buildPyramid = num => {
  var stars = '';
  for (var i = 1; i <= num; i++) {
    for (var k = 1; k <= num - i + 1; k++) {
      stars += ' ';
    }
    for (var j = 1; j <= i; j++) {
      stars += '* ';
    }
    stars = stars + '\n';
  }
  return stars;
};