var assert=require('assert');
describe('Array',function(){
	describe('indexOf',function(){
		it('should return -1 when the value is not present',function(){
		assert.equal(3, [1,2,3].indexOf(5))：
		});
	});
});
var assert=require('assert');
describe('Array',function(){
	describe('indexOf',function(){
		it('should return -1 when the value is not present',function(){
			assert.equal(-1,[1,2,3].indexOf(0));
		});
	});
});
edit test.js