2017-09-16 58 views
-3

當函數在類和單元測試函數計算它給我一些錯誤。如何使用TDD測試計算函數?請幫幫我。如何使用TDD單元測試此功能?

1.calculation.js

export default class calculation { 
    static calculate(a, b) { 
     var sum1 = this.addition(a, b); 
     var sub1 = this.subtract(a, b); 
     return { 
      sum1: sum1, 
      sub1: sub1 
     }; 
    } 
    static addition (a, b) { 
     var sum = a + b; 
     return sum; 
    } 
    static subtract (a, b) { 
     var sub = a - b; 
     return sub; 
    } 
} 

2.calculation.test.js

const calculate = require('../app/calculation'); 
describe('calculation',() => { 
    let result; 
    beforeEach(() => { 
     result = calculate.calculate(100, 50); 
    }); 
    it('correct sum of two number is',() => { 
     expect(result.sum1).toBe(150); 
    }); 
    it('correct subtract of two number is',() => { 
     expect(result.sub1).toBe(50); 
    }); 

});

錯誤是...

●計算>兩個號碼是否正確總和

TypeError: Cannot read property 'sum1' of undefined 

    at Object.<anonymous> (__tests__/calculation.test.js:8:14) 
    at tryCallTwo (node_modules/promise/lib/core.js:45:5) 
    at doResolve (node_modules/promise/lib/core.js:200:13) 
    at new Promise (node_modules/promise/lib/core.js:66:3) 
    at tryCallOne (node_modules/promise/lib/core.js:37:12) 
    at node_modules/promise/lib/core.js:123:15 

●計算>兩個數相減正確是

TypeError: calculate.calculate is not a function 

    at Object.<anonymous> (__tests__/calculation.test.js:5:18) 
    at tryCallTwo (node_modules/promise/lib/core.js:45:5) 
    at doResolve (node_modules/promise/lib/core.js:200:13) 
    at new Promise (node_modules/promise/lib/core.js:66:3) 
    at tryCallOne (node_modules/promise/lib/core.js:37:12) 
    at node_modules/promise/lib/core.js:123:15 

●計算>正確的減法的兩個數字是

TypeError: Cannot read property 'sub1' of undefined 

    at Object.<anonymous> (__tests__/calculation.test.js:11:14) 
    at tryCallTwo (node_modules/promise/lib/core.js:45:5) 
    at doResolve (node_modules/promise/lib/core.js:200:13) 
    at new Promise (node_modules/promise/lib/core.js:66:3) 
    at tryCallOne (node_modules/promise/lib/core.js:37:12) 
    at node_modules/promise/lib/core.js:123:15 

計算 ✕兩個數目正確和是(3毫秒) ✕兩個數正確減爲(1毫秒)

測試套件:1失敗,1個總 測試:2失敗,2總 快照:0總 時間:0.818s,估計1s 跑完所有測試套件。 npm ERR!測試失敗。參見上面的更多細節。

+0

●計算>兩個號碼是否正確總和 類型錯誤:在對象不能讀取的不確定 財產‘總和’。在doResolve(node_modules/promise/lib/core.js:200:13)處,在tryCallTwo(node_modules/promise/lib/core.js:45:5) 處運行(__tests__/calculation.test.js:8:14) (node_modules/promise/lib/core.js:66:3) at tryCallOne(node_modules/promise/lib/core.js:37:12) at node_modules/promise/lib/core.js:123 :15 ●計算>正確減去兩個數字是 –

+0

運行命令npm test然後給出這樣的錯誤。我將包括上面的所有文件。 @尼古拉斯塔。 –

+0

更改result.sum1和result.sub1後,此處出現同樣的錯誤。 @尼古拉斯塔 –

回答

0

我認爲你問的是錯誤的問題。 測試驅動開發是一個開發過程。

你不用TDD測試某些東西,你可以使用它來構建一些東西。

我推薦這個excellent article on TDD.我認爲它會清除一切。

+0

謝謝@bamse –