[英]How to unit test an errorexception with mocha?
假設我有這個功能:
try
{
if (s1 <0 || s2<0 ||s3 <0){
throw new Error('InvalidTriangleExeption ');
}
let s = (s1 + s2 + s3)/2;
var area = Math.sqrt(s*((s-s1)*(s-s2)*(s-s3)));
return area;
}
catch{
throw new Error('InvalidTriangleExeption ');
}}
我正在嘗試編寫摩卡單元測試:
expect( question3(-1,4,5)).to.throw('InvalidTriangleExeption')
但是我的測試只是崩潰並顯示錯誤:
Error: InvalidTriangleExeption
at go (src/questions/question3.js:13:15)
at Context.<anonymous> (tests/question3.spec.js:14:13)
如何編寫用於確認已引發異常的Mocha測試的斷言?
您可以綁定args解決此問題
expect(question3.bind(this, -1, 5, 4)).to.throw(); // PASS
expect(question3.bind(this, -1, 5, 4)).to.throw('InvalidTriangleExeption'); // PASS
expect(question3.bind(this, -1, 5, 4)).to.throw('ABCExeption'); // FAIL
expect(question3.bind(this, -1, 5, 4)).to.not.throw('InvalidTriangleExeption'); // FAIL
expect(question3.bind(this, -1, 5, 4)).to.not.throw('ABCExeption'); // PASS
expect(question3.bind(this, -1, 5, 4)).to.not.throw(); // FAIL
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