測試關閉了功能

Question

我現在都有兩個功能與測試：

function A(x) { 
    // do A things 
    return Aresults; 
} 
function testA() { 
    // this put A through its test and make sure it does what it's supposed to 
} 

和

function B(x) { 
    // do B things which involve using A 
    return Bresults; 
} 
function testB() { 
    // this put B through its test and make sure it does what it's supposed to 
} 

我現在認識到A的唯一用途是B.所以我想重新隔離和保護代碼爲因素：

function B(x) { 
    function A(x) { 
    // do A things 
    return Aresults; 
    } 
    // do B things which involve using A 
    return Bresults; 
} 
function testB() { 
    // this put B through its test and make sure it does what it's supposed to 
} 

我的問題是我怎麼能添加試驗A現在，它是B的關閉切換功能？即我的testA功能在哪裏？

Answer 1

你不需要。單元測試的目的是測試行爲而不是執行。

所以你測試什麼方法，而不是它如何做。

從這個角度來看，你應該只關心函數調用產生的副作用，就是這樣。