Javascript 如何测试构造函数中抛出的错误?
我正试图用我的chai测试捕获构造函数中抛出的错误:Javascript 如何测试构造函数中抛出的错误?,javascript,chai,Javascript,Chai,我正试图用我的chai测试捕获构造函数中抛出的错误: 'use strict' const chai = require('chai') const expect = chai.expect describe('A rover must be placed inside the platform', function() { it('A Rover at position -1 2 S should throw an error', function() { expect(new
'use strict'
const chai = require('chai')
const expect = chai.expect
describe('A rover must be placed inside the platform', function() {
it('A Rover at position -1 2 S should throw an error', function() {
expect(new Rover(-1, 2, 'N')).should.throw(Error ('Rover has landed outside of the platform'));
})
})
class Rover {
constructor(x, y, heading) {
this.x = x;
this.y = y;
this.heading = heading;
if (this.x > 5 || this.x < 0 || this.y > 5 || this.y < 0) {
throw Error(`Rover has landed outside of the platform`);
}
}
}
甚至可以用chai捕捉构造函数中抛出的错误吗?您可以将对象创建包装在函数调用中,然后期望抛出异常
expect(function () {
new Rover(-1, 2, 'N');
}).to.throw('Rover has landed outside of the platform');
请参阅答案。执行此操作的方法与测试任何抛出错误的方法相同-延迟执行。参见文档和示例。
expect(function () {
new Rover(-1, 2, 'N');
}).to.throw('Rover has landed outside of the platform');