I am working on an application in salesforce for this i have write 3 classes and it's 3 test class but when i was go to make its package it's give me error of code coverage of 5% atleast 75 % required after that  i was checkmy test class but i am unable understand the issue. below is one of my class with its test class and it's code coverage is 0 Please check it


public class Woeid_JSON2Woeid_Apex {     
public class Place {         
public String woeid;     
}     
public class Query {        
 public Integer count;         
public String created;         
public String lang;         
public Results results;     
}     
public Query query;     
public class Results {         
public Place place;     
}          
public static Woeid_JSON2Woeid_Apex parse(String json) {         return (Woeid_JSON2Woeid_Apex) System.JSON.deserialize(json, Woeid_JSON2Woeid_Apex.class);    
 }    
}
and it's test class

@isTest
private class Woeid_JSON2Woeid_ApexTest {
public static Woeid_JSON2Woeid_Apex parse(String json) {
        return (Woeid_JSON2Woeid_Apex) System.JSON.deserialize(json, Woeid_JSON2Woeid_Apex.class);
    }
   static testMethod void testParse() {
        String json = '{\"query\":{\"count\":1,\"created\":\"2015-08-05T10:25:32Z\",\"lang\":\"en-US\",\"results\":{\"place\":{\"woeid\":\"2390809\"}}}}';
        Woeid_JSON2Woeid_Apex obj = parse(json);
        //System.assert(obj != null);
    }   

}

Please reply me.