Jasmine JavaScript测试框架的评估问题

时间:2017-02-12 12:26:00

标签: javascript jasmine

我遇到了Jasmine(版本2.4)JavaScript测试框架的问题。

我正在udemy.com上创建一个课程,但是在线检查员不会接受我的代码的最后一部分,我正在使用“expect(variable).toBe(true);”茉莉花的功能。

describe('A div with class', function() {
  var parent = document.getElementsByClassName('media')[0];

  it('"media" should exist.', function() {
    expect(parent).toBeDefined();
  });

  var child = document.getElementsByClassName('media-body')[0];

  it('"media-body" should exist.', function() {
    expect(child).toBeDefined();
  });

});

describe('A div with class "media"', function() {
  var parent = document.getElementsByClassName('media')[0];
  var child = document.getElementsByClassName('media-body')[0];

  var answer;

  if (parent.firstChild == child) {
    answer = true;
  } else {
    answer = false;
  }

  it('should have a div with class "media-body" as its child.', function() {
    expect(answer).toBe(true);
  });

});

udemy.com页面的测试输出是:

“一个与班级”媒体“的div应该有一个div,其中”media-body“是其孩子。

预期错误为真“

我的更新代码现在效果很好:

describe('A div with the class', function() {

var class1 = 'media';
var failClass1 = '"' + class1 + '"' + ' should exist.'

var class2 = 'media-body';
var failClass2 = '"' + class2 + '"' + ' should exist.'

var element1 = null;
var element2 = null;

var relationship1_2 = null;
var failRelationship = '"' + class2 + '"' + ' should be nested in a div with the class "' + class1 + '".'

beforeEach(function() {
  element1 = document.getElementsByClassName(class1)[0];
  element2 = document.getElementsByClassName(class2)[0];
  relationship1_2 = element1.contains(element2);
})

it(failClass1, function() {
  expect(element1).toBeDefined();
});

it(failClass2, function() {
  expect(element2).toBeDefined();
});

it(failRelationship, function() {
  expect(relationship1_2).toBe(true);
});

});

1 个答案:

答案 0 :(得分:0)

我建议使用beforeEach块重新组织它,如下例所示:

describe('testing media tag hierarchy', function() {

  var parent = null;

  beforeEach(function() {
    parent = document.getElementsByClassName('media')[0];
  })

  it('"media" should exist.', function() {
    expect(parent).toBeDefined();
  });

  it('should have a div with class "media-body" as its child.', function() {
    expect(parent.firstChild.hasClass('media-body')).toBeTruthy();
  });
});

我不确定这会解决您的问题,但可能会更容易阅读。