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我在第一次使用Mocha和Chai時遇到了一個奇怪的錯誤。我之前使用過的唯一框架是Jasmine,如果這能幫助你弄清楚我做錯了什麼。AssertionError:預計{}是函數
我只是想確保我的構造函數不會拋出錯誤。我已經能夠將代碼減少到這一點,仍然得到錯誤:
class MyLib {
constructor() {}
}
export default MyLib;
這是測試文件:
import chai from 'chai';
let { expect } = chai;
import MyLib from '../index';
describe('mylib-js',() => {
describe('constructor',() => {
it('should work',() => {
expect(new MyLib()).to.not.throw();
})
});
});
這是摩卡輸出:
d:\path\to\mylib-js>mocha --require babel-core/register
mylib-js
constructor
1) should work
0 passing (23ms)
1 failing
1) mylib-js constructor should work:
AssertionError: expected {} to be a function
at Assertion.an (d:\path\to\mylib-js\node_modules\chai\lib\chai\core\assertions.js:169:10)
at Assertion.assert (d:\path\to\mylib-js\node_modules\chai\lib\chai\utils\addChainableMethod.js:84:49)
at Assertion.assertThrows (d:\path\to\mylib-js\node_modules\chai\lib\chai\core\assertions.js:1273:32)
at Assertion.ctx.(anonymous function) [as throw] (d:\path\to\mylib-js\node_modules\chai\lib\chai\utils\addMethod.js:41:25)
at Context.<anonymous> (test.js:10:4)
at callFn (C:\Users\Myuser\AppData\Roaming\npm\node_modules\mocha\lib\runnable.js:315:21)
at Test.Runnable.run (C:\Users\Myuser\AppData\Roaming\npm\node_modules\mocha\lib\runnable.js:308:7)
at Runner.runTest (C:\Users\Myuser\AppData\Roaming\npm\node_modules\mocha\lib\runner.js:422:10)
at C:\Users\Myuser\AppData\Roaming\npm\node_modules\mocha\lib\runner.js:533:12
at next (C:\Users\Myuser\AppData\Roaming\npm\node_modules\mocha\lib\runner.js:342:14)
at C:\Users\Myuser\AppData\Roaming\npm\node_modules\mocha\lib\runner.js:352:7
at next (C:\Users\Myuser\AppData\Roaming\npm\node_modules\mocha\lib\runner.js:284:14)
at Immediate._onImmediate (C:\Users\Myuser\AppData\Roaming\npm\node_modules\mocha\lib\runner.js:320:5)
我不知道它從錯誤輸出中得到{}
。它想告訴我什麼?
如果你有'export default class MyLib {constructor(){}}',它會說什麼? –
@SzabolcsDézsi:當我這樣做時,我得到了完全相同的錯誤 – damd
應該是'expect(MyLib).to.not.throw();'? – lintmouse