powOfTwo.js代码

exports.judge = function (a) {  
    if(a == 2) {
        return true;
    }
    if(a % 2) {
        return false;
    }else {
        a = a / 2;
        return judge(a);
    }
}

测试代码：

var powerOfTwo = require('../powerOfTwo.js');

describe('basic test', function(){
    it('test sample', function() {
        expect(powerOfTwo.judge(16)).toBe(true);
        expect(powerOfTwo.judge(12)).toBe(false);
        expect(powerOfTwo.judge(1024)).toBe(true);
    })
})

报错:

$ jasmine-node powerOfTwo-spec.js
F

Failures:

  1) basic test test sample
   Message:
     ReferenceError: judge is not defined
   Stacktrace:
     ReferenceError: judge is not defined
    at Object.exports.judge (D:\vanilla-javascript\powerOfTwo.js:9:16)
    at . (D:\vanilla-javascript\spec\powerOfTwo-spec.js:5:27)

Finished in 0.065 seconds
1 test, 1 assertion, 1 failure, 0 skipped