请考虑以下示例Javascript代码:
function privateFunction (time) {
if (time < 12) { console.log('Good morning'); }
if (time >= 12 && time <19) { console.log('Good afternoon'); }
else { console.log('Good night!'); }
};
我应该如何在nodejs上使用mocha (可能还有sinonjs)进行单元测试,注意到这是一个在模块内部调用的私有函数?我需要传入参数并检查函数是否将正确的内容记录到控制台。
我可以对console.warn
和console.error
执行相同的操作吗
发布于 2015-06-04 00:45:11
我更喜欢mocha-sinon
而不是“普通的”sinon,因为它与Mocha很好地集成在一起。
示例:
var expect = require('chai').expect;
require('mocha-sinon');
// Function to test, can also be in another file and as long as it's
// being called through some public interface it should be testable.
// If it's not in any way exposed/exported, testing will be problematic.
function privateFunction (time) {
if (time < 12) { console.log('Good morning'); }
if (time >= 12 && time <19) { console.log('Good afternoon'); }
else { console.log('Good night!'); }
}
describe('privateFunction()', function() {
beforeEach(function() {
this.sinon.stub(console, 'log');
});
it('should log "Good morning" for hours < 12', function() {
privateFunction(5);
expect( console.log.calledOnce ).to.be.true;
expect( console.log.calledWith('Good morning') ).to.be.true;
});
it('should log "Good afternoon" for hours >= 12 and < 19', function() {
privateFunction(15);
expect( console.log.calledOnce ).to.be.true;
expect( console.log.calledWith('Good afternoon') ).to.be.true;
});
it('should log "Good night!" for hours >= 19', function() {
privateFunction(20);
expect( console.log.calledOnce ).to.be.true;
expect( console.log.calledWith('Good night!') ).to.be.true;
});
});
一个潜在的问题:一些Mocha记者也使用console.log
,所以存根它的测试可能不会产生任何输出。
有一个变通方法,但它也不是很理想,因为它会将Mocha输出与privateFunction()
的输出混杂在一起。如果这不是问题,请用下面的代码替换beforeEach()
:
beforeEach(function() {
var log = console.log;
this.sinon.stub(console, 'log', function() {
return log.apply(log, arguments);
});
});
https://stackoverflow.com/questions/30625404
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