BDD in NodeJS

BDD

BDD 是 TDD 的超集。即 BDD 包含了 TDD 所有的东西。

是一种敏捷软件开发的技术。它鼓励软件项目中的开发者、QA 和非技术人员或商业参与者之间的协作。

优点

Mocha

测试框架

优点

Install

npm install -g mocha

构件

同步

var assert = require('chai').assert;

describe('Array', function() {
  describe('#indexOf()', function() {
    it('should return -1 when the value is not present', function(){
      assert.equal(-1, [1, 2, 3].indexOf(5));
    });

    it('2', function() {
      assert.equal(-1, [1, 2, 3].indexOf(0));
    });

    it('3', function() {
      assert.equal(1, [1, 2, 3].indexOf(2));
    });
  });
});

异步

describe('User', function(){
  describe('#save()', function(){
    it('should save without error', function(done){
      var user = new User('Luna');
      user.save(function(err){
        if (err) done(err);
        done();
      });
    })
  })
});

未定的测试

describe('Array', function(){
  describe('#indexOf()', function(){
    it('should return -1 when the value is not present');
  });
});

before

after 的使用与 before 同理。

describe('Array', function(){
  before(function(){
    // ...
  });

  describe('#indexOf()', function(){
    it('should return -1 when not present', function(){
      [1,2,3].indexOf(4).should.equal(-1);
    });
  });
});

同一个 describe 下可以有多个 before，执行顺序与代码顺序相同。 同一个 describe 下的执行顺序为 before, beforeEach, afterEach, after。 当一个 it 有多个 before 的时候，执行顺序从最外围的 describe 的 before 开始，其余同理。

beforeEach

beforeEach 只对当前 describe 下的所有子孙it生效。

describe('Connection', function(){
  var db = new Connection
    , tobi = new User('tobi')
    , loki = new User('loki')
    , jane = new User('jane');

  beforeEach(function(done){
    db.clear(function(err){
      if (err) return done(err);
      db.save([tobi, loki, jane], done);
    });
  })

  describe('#find()', function(){
    it('respond with matching records', function(done){
      db.find({ type: 'User' }, function(err, res){
        if (err) return done(err);
        res.should.have.length(3);
        done();
      })
    })
  })
})

only

describe('Array', function(){
  describe.only('#indexOf()', function(){

  })
})

skip

skip describe

describe('Array', function(){
  describe.skip('#indexOf()', function(){
    ...
  })
})

或者，skip 子用例

describe('Array', function(){
  describe('#indexOf()', function(){
    it.skip('should return -1 unless present', function(){

    })

    it('should return the index when present', function(){

    })
  })
})

Chai

断言库

优点

Install

后端 npm install --save-dev chai

前端

<script src="chai.js" type="text/javascript"></script>

Assert

var assert = require('chai').assert
  , foo = 'bar'
  , beverages = { tea: [ 'chai', 'matcha', 'oolong' ] };

assert.typeOf(foo, 'string', 'foo is a string');
assert.equal(foo, 'bar', 'foo equal `bar`');
assert.lengthOf(foo, 3, 'foo`s value has a length of 3');
assert.lengthOf(beverages.tea, 3, 'beverages has 3 types of tea');

Expect

var expect = require('chai').expect
  , foo = 'bar'
  , beverages = { tea: [ 'chai', 'matcha', 'oolong' ] };

expect(foo).to.be.a('string');
expect(foo).to.equal('bar');
expect(foo).to.have.length(3);
expect(beverages).to.have.property('tea').with.length(3);

var answer = 43;

// AssertionError: expected 43 to equal 42.
expect(answer).to.equal(42);

// AssertionError: topic [answer]: expected 43 to equal 42.
expect(answer, 'topic [answer]').to.equal(42);

Should

var should = require('chai').should() //actually call the the function
  , foo = 'bar'
  , beverages = { tea: [ 'chai', 'matcha', 'oolong' ] };

foo.should.be.a('string');
foo.should.equal('bar');
foo.should.have.length(3);
beverages.should.have.property('tea').with.length(3);

其他用法

var should = require('chai').should();
db.get(1234, function (err, doc) {
  should.not.exist(err);
  should.exist(doc);
  doc.should.be.an('object');
});

Plugin

前端测试

Mocha in Browser

<html>
<head>
  <meta charset="utf-8">
  <title>Mocha Tests</title>
  <link rel="stylesheet" href="mocha.css" />
</head>
<body>
  <div id="mocha"></div>
  <script src="jquery.js"></script>
  <script src="chai.js"></script>
  <script src="mocha.js"></script>
  <script>
    mocha.setup('bdd')
    mocha.reporter('spec');
    should = chai.should();
  </script>
  <script src="test.js"></script>
  <script>
    mocha.checkLeaks();
    mocha.globals(['jQuery']);
    mocha.run();
  </script>
</body>
</html>

工具

gremlins.js

supertest

PhantomJS

SlimerJS

CasperJS

intern

PhantomCSS