利用should.js进行测试

nodejs 环境 ， 安装should.js包 （npm install should）

 var should = require('should');

 //正确1， 错误0   100
 precentNum2(1,0).should.eql(100);
 //正确0， 错误1   0
 precentNum2(0,1).should.eql(0);
 //正确0， 错误0  －－
 precentNum2(0,0).should.eql('- -');
 //正确1， 错误1  50
 precentNum2(1,1).should.eql(50);
 //正确1， 错误3  25
 precentNum2(1,3).should.eql(25);
 //正确1， 错误2  33
 precentNum2(1,2).should.eql(33);
 //正确1， 错误2  33
 precentNum2(1,4).should.eql(33);

 function precentNum2(num, num2) {
     var correctQuestions = parseInt(num);
     var wrongQuestions = parseInt(num2);

     if((correctQuestions + wrongQuestions) === 0) {
         return  "- -";
     } else if(correctQuestions === (correctQuestions + wrongQuestions)) {
         return 100;
     } else if(correctQuestions === 0 && wrongQuestions !== 0) {
         return 0;
     } else {
         var temp = correctQuestions / (correctQuestions + wrongQuestions);
         var tempResult = parseInt(temp.toFixed(2).substr(2,2));
         if(tempResult > 0 && tempResult < 101) {
             return tempResult;
         } else {
             return "- -";
         }
     }
 }

mocha + should  (npm install  -g mocha)

 var should = require('should');
 describe('Precent', function(){
     describe('Precent Test', function(){
           it('Test precentNum2', function(){
             //正确1， 错误0   100
             precentNum2(1,0).should.eql(100);
             //正确0， 错误1   0
             precentNum2(0,1).should.eql(0);
             //正确0， 错误0  －－
             precentNum2(0,0).should.eql('- -');
             //正确1， 错误1  50
             precentNum2(1,1).should.eql(50);
             //正确1， 错误3  25
             precentNum2(1,3).should.eql(25);
             //正确1， 错误2  33
             precentNum2(1,2).should.eql(33);
             //正确1， 错误2  33
             precentNum2(1,4).should.eql(20);
         })
     })
 });

 function precentNum2(num, num2) {
     var correctQuestions = parseInt(num);
     var wrongQuestions = parseInt(num2);

     if((correctQuestions + wrongQuestions) === 0) {
         return  "- -";
     } else if(correctQuestions === (correctQuestions + wrongQuestions)) {
         return 100;
     } else if(correctQuestions === 0 && wrongQuestions !== 0) {
         return 0;
     } else {
         var temp = correctQuestions / (correctQuestions + wrongQuestions);
         var tempResult = parseInt(temp.toFixed(2).substr(2,2));
         if(tempResult > 0 && tempResult < 101) {
             return tempResult;
         } else {
             return "- -";
         }
     }
 }