我正在尝试使用chai测试捕获在构造函数中引发的错误:
'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 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`);
}
}
}
构造函数正确抛出该错误,但是测试未捕获到该错误:
A rover must be placed inside the platform
1) A Rover at position -1 2 S should throw an error
1 failing
1) A rover must be placed inside the platform
A Rover at position -1 2 S should throw an error:
Error: Rover has landed outside of the platform
甚至有可能用chai捕获在构造函数中引发的错误?
最佳答案
您可以将对象创建包装在函数调用中,然后期望引发异常。
expect(function () {
new Rover(-1, 2, 'N');
}).to.throw('Rover has landed outside of the platform');
请参见related答案。