it('should return the origin string if the string does not have any Chinese characters', function() {
var src = 'string without Chinese characters';
utils.unicodeToUtf8(src).should.equal(src);
});
it('should not return the origin string if the string has Chinese characters', function() {
var src = 'string with Chinese characters 你好';
utils.unicodeToUtf8(src).should.not.equal(src);
});
