Question

作为一项学习练习，我尝试使用Node和Express来运行Bowling Game kata的版本，并且我发现了一个奇怪的问题。我可以使用一些帮助来理解为什么来自比我更了解Node和Express的人。

在尝试使攻击测试用例工作时编写了测试用例，当我尝试在命令行使用 mocha 运行以下测试时，我得到以下超级错误：{{ 1}}。

但是，如果我在game.js（"Uncaught TypeError: undefined is not a function" at /Users/cdurfee/bitbucket/neontapir/node_modules/supertest/lib/test.js:125:21）中注释掉这条看似无关紧要的行，那么就没有失败，但当然行为是错误的。我怀疑它是一个阵外界限问题，但我不知道一个很好的方法来解决这个问题。

这里是两个文件的全部内容和mocha的控制台输出。

total += rolls[ball + 2];

game.js

08:55 $ mocha --reporter spec

  Scoring a bowling game
    gutter game
      ✓ should return 0 
    single pin game
      ✓ should return 20 
    spare
      ✓ should return 16 after spare and a 3 
    strike
      ✓ should return 24 after strike, 4 and a 3 
      1) should return 24 after strike, 4 and a 3
double callback!
double callback!
double callback!
double callback!
double callback!
double callback!
double callback!
double callback!
double callback!
double callback!
double callback!
double callback!
double callback!
double callback!
double callback!
    perfect game

  4 passing (71ms)
  1 failing

  1) Scoring a bowling game strike should return 24 after strike, 4 and a 3:
     Uncaught TypeError: undefined is not a function
      at /Users/cdurfee/bitbucket/neontapir/node_modules/supertest/lib/test.js:125:21
      at Test.Request.callback (/Users/cdurfee/bitbucket/neontapir/node_modules/supertest/node_modules/superagent/lib/node/index.js:660:30)
      at ClientRequest.<anonymous> (/Users/cdurfee/bitbucket/neontapir/node_modules/supertest/node_modules/superagent/lib/node/index.js:628:10)
      at ClientRequest.EventEmitter.emit (events.js:95:17)
      at Socket.socketErrorListener (http.js:1547:9)
      at Socket.EventEmitter.emit (events.js:95:17)
      at net.js:441:14
      at process._tickCallback (node.js:415:13)

测试/ test.js

var express = require('express');
var app = exports.app = express();

app.get('/start', function(req, res) {
    rolls = new Array();
    attempt = 0;
});

app.post('/bowl/:pins', function(req, res) {
    rolls[attempt] = parseInt(req.params.pins);
    attempt++;
});

app.get('/score', function(req, res) {
    var total = 0;
    var ball = 0;
    for (var frame = 0; frame < 10; frame++) {
        if (rolls[ball] + rolls[ball + 1] == 10) { 
            total += rolls[ball + 2]; // this line causes the double callback
        }
        total += rolls[ball] + rolls[ball + 1];
        ball += 2;
    }

    res.send(200, {score: total});
});

app.listen(process.env.PORT || 3000);

Answer 1

添加到我的previous comment

我也看到你的测试用例不是异步的，这几乎肯定是你的问题。

你应该有一个回调：done

  describe('gutter game', function() {
    it('should return 0', function(done) { // callback is provided as argument by mocha 
        rollMany(20,0);
        assertScoreEquals(0);
        done();  // This needs to be called when the test is finished, for async operations.
    });
});

我建议使用supertest-as-promised而不是supertest，因为当你需要运行大量请求时，这可以使事情变得更容易。这个库，加上bluebird，可以使你的测试变得更简单。

This gist使用Bluebird承诺和supertest-as-promised重写了您的测试，并对我所做的更改进行了评论。

在迭代数组时Supertest双回调

1 个答案: