[英]Testing an invalid argument w/ Chai in JavaScript
前言:上周,我開始修改JavaScript,因此這可能是(也可能不是)一個愚蠢的問題(盡管我會押注前者)。
我創建了此方法,以使用Date()
初始化getDayOfTheWeekFromDate
時返回星期幾。 我正在嘗試使用chai
創建一個測試,以了解它在輸入偽造的參數(如字符串)時會做什么。
兩個問題:
我將如何使用chai
為getDayOfTheWeekFromDate
測試偽造的參數?
DateHelper.prototype.getDayOfTheWeekFromDate = function(inputDate) { if (inputDate instanceof Date) { inputDate = new Date(); var dayOfTheWeek = inputDate.getDay(); switch(dayOfTheWeek) { case 0: return "Sunday"; case 1: return "Monday"; case 2: return "Tuesday"; case 3: return "Wednesday"; case 4: return "Thursday"; case 5: return "Friday"; case 6: return "Saturday"; default: return; } } else { // I'm shooting for doing nothing if the input isn't a Date() // How would I test this? return; } };
我已經建立了一個測試類來測試Date助手類。
'use strict';
var chai = require('chai');
var expect = chai.expect;
var DateHelper = require('../date_helper');
chai.config.includeStack = true; // true enables stack trace
describe('DateHelper', function() {
context('With a valid date value, getDayOfTheWeekFromDate', function() {
it('should return Tuesday', function() {
expect(subject.getDayOfTheWeekFromDate(new Date())).to.eq('Tuesday');
});
});
});
我試過了,但是當我向初始化器輸入一個字符串時,控制台會顯示出來,但不知道undefined是什么。 我應該在這里測試什么?
context('With a invalid date value, getDayOfTheWeekFromDate', function() {
it('should return nothing', function() {
expect(subject.getDayOfTheWeekFromDate('bogusArgument').to.be.undefined;
});
});
如果所有括號都平衡,它將很好用:
expect(subject.getDayOfTheWeekFromDate('bogusArgument')).to.be.undefined;
// ^
// this one was missing /
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