这是我的这个问题的后续问题:How to test an ES6 class that needs jquery? 。
我最终将我的测试运行程序更改为 karma &到目前为止一直运行良好。唯一的问题是我认为我的主张不起作用。
这是我使用 mocha 编写的第一个单元测试, sinon & chai :
import {Weather} from '../js/weather';
import chai from 'chai';
import sinon from 'sinon';
let assert = chai.assert;
describe('weatherbot', function() {
beforeEach(() => {
this.xhr = sinon.useFakeXMLHttpRequest();
this.requests = [];
this.xhr.onCreate = function(xhr) {
this.requests.push(xhr);
}.bind(this);
});
afterEach(() => {
this.xhr.restore();
});
it('should return a resolved promise if call is successful', () => {
let weather = new Weather(43.65967339999999, -79.72506369999999);
let data = '{"coord":{"lon":-79.73,"lat":43.66},"weather":[{"id":521,"main":"Rain","description":"shower rain","icon":"09d"}],"base":"stations","main":{"temp":15.28,"pressure":1009,"humidity":82,"temp_min":13,"temp_max":17},"visibility":24140,"wind":{"speed":7.2,"deg":30},"clouds":{"all":90},"dt":1496770020,"sys":{"type":1,"id":3722,"message":0.0047,"country":"CA","sunrise":1496741873,"sunset":1496797083},"id":5907364,"name":"Brampton","cod":200}';
weather.getWeather().then((data) => {
//assert.strictEqual(data.main.temp, 15.2);
assert.strictEqual(true, false, 'these booleans are strictly equal');
});
this.requests[0].respond(
200,
{ "Content-Type": "application/json" },
data
);
});
});
如果你看第二个断言，它实际上应该失败，但令人惊讶的是它通过了。
这是我正在测试的类，请注意我已经修复了 jquery导入:
import * as jQuery from 'jquery'
export class Weather {
/**
* Constructor for Weather class
*
* @param latitude
* @param longitude
*/
constructor(latitude, longitude) {
this.latitude = latitude;
this.longitude = longitude;
}
/**
* Fetches the weather using API
*/
getWeather() {
return $.ajax({
url: 'http://localhost:8080/weather?lat=' + this.latitude + '&lon=' + this.longitude,
method: "GET",
}).promise();
}
}
这是我的 karma配置以及:
module.exports = function(config) {
config.set({
// base path that will be used to resolve all patterns (eg. files, exclude)
basePath: '',
// frameworks to use
// available frameworks: https://npmjs.org/browse/keyword/karma-adapter
frameworks: ['mocha'],
// list of files / patterns to load in the browser
files: [
'test/*.js',
'node_modules/jquery/dist/jquery.js'
],
// list of files to exclude
exclude: [
],
// preprocess matching files before serving them to the browser
// available preprocessors: https://npmjs.org/browse/keyword/karma-preprocessor
preprocessors: {
'test/*.js': ['webpack','babel']
},
// test results reporter to use
// possible values: 'dots', 'progress'
// available reporters: https://npmjs.org/browse/keyword/karma-reporter
reporters: ['spec'],
// web server port
port: 9876,
// enable / disable colors in the output (reporters and logs)
colors: true,
// level of logging
// possible values: config.LOG_DISABLE || config.LOG_ERROR || config.LOG_WARN || config.LOG_INFO || config.LOG_DEBUG
logLevel: config.LOG_INFO,
// enable / disable watching file and executing tests whenever any file changes
autoWatch: true,
// start these browsers
// available browser launchers: https://npmjs.org/browse/keyword/karma-launcher
browsers: ['Chrome'],
// Continuous Integration mode
// if true, Karma captures browsers, runs the tests and exits
singleRun: false,
// Concurrency level
// how many browser should be started simultaneous
concurrency: Infinity
})
}
最后是测试的输出，可能有点长:
→ karma start
Hash: e0bdc8cc97632b01d813
Version: webpack 2.6.1
Time: 53ms
webpack: Compiled successfully.
webpack: Compiling...
22 06 2017 12:29:04.006:WARN [karma]: No captured browser, open http://localhost:9876/
Hash: a6bb01d664bd0198774e
Version: webpack 2.6.1
Time: 1604ms
Asset Size Chunks Chunk Names
test/index.js 1.46 MB 0 [emitted] [big] test/index.js
chunk {0} test/index.js (test/index.js) 1.45 MB [entry] [rendered]
[5] ./~/sinon/lib/sinon/util/core/deep-equal.js 2.69 kB {0} [built]
[14] ./~/sinon/lib/sinon/call.js 6.51 kB {0} [built]
[20] ./~/sinon/lib/sinon/assert.js 6.94 kB {0} [built]
[21] ./~/sinon/lib/sinon/util/core/deprecated.js 999 bytes {0} [built]
[25] ./~/sinon/lib/sinon/util/fake_server.js 7.97 kB {0} [built]
[26] ./~/sinon/lib/sinon/util/fake_timers.js 799 bytes {0} [built]
[27] ./~/sinon/lib/sinon/util/fake_xml_http_request.js 20.2 kB {0} [built]
[42] ./~/sinon/lib/sinon/collection.js 2.97 kB {0} [built]
[43] ./~/sinon/lib/sinon/mock-expectation.js 7.77 kB {0} [built]
[54] ./js/weather.js 531 bytes {0} [built]
[55] ./~/chai/index.js 40 bytes {0} [built]
[56] ./~/sinon/lib/sinon.js 2.6 kB {0} [built]
[106] ./~/sinon/lib/sinon/sandbox.js 3.8 kB {0} [built]
[112] ./~/sinon/lib/sinon/util/core/index.js 820 bytes {0} [built]
[119] ./test/index.js 1.38 kB {0} [built]
+ 105 hidden modules
webpack: Compiled successfully.
22 06 2017 12:29:04.029:INFO [karma]: Karma v1.7.0 server started at http://0.0.0.0:9876/
22 06 2017 12:29:04.029:INFO [launcher]: Launching browser Chrome with unlimited concurrency
22 06 2017 12:29:04.085:INFO [launcher]: Starting browser Chrome
22 06 2017 12:29:05.872:INFO [Chrome 59.0.3071 (Mac OS X 10.12.5)]: Connected on socket _FwfzgJZO3uGGE3xAAAA with id 76410708
weatherbot
✓ should return a resolved promise if call is successful
Chrome 59.0.3071 (Mac OS X 10.12.5): Executed 1 of 1 SUCCESS (0.02 secs / 0.009 secs)
TOTAL: 1 SUCCESS
我在这里用谷歌搜索了很多，看来我正在按照我应该的方式测试这个 promise ，但我认为我在这里遗漏了一些东西。我怀疑sinon可能是这里的罪魁祸首，它也应该返回 promise 。
最佳答案
是的，你失踪了something :promise必须由测试函数返回，否则需要调用done回调
return weather.getWeather().then((data) => {
//assert.strictEqual(data.main.temp, 15.2);
assert.strictEqual(true, false, 'these booleans are strictly equal');
});
关于javascript - 在测试 Promise 时如何确保断言实际上通过或失败？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/44692382/