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Zillow Mashup Test Method

I'm new to apex and was trying to use the zillow mashup posted here http://wiki.apexdevnet.com/index.php/Force.com_Zillow_Mashup
I have everything working, but I can't figure out how to get the test 75+% of the code. Currently it's at 44%

Code:
public class ZillowService {
 
 public String serviceName {get ; private set ; }
 
 public ZillowService( String serviceName ){
  this.serviceName = serviceName ;
 }
 
 public ZillowService() {
 }
 
 public ZillowTypes.PropertySearchResponse searchZillow( String street, String City, String state, String zip ){
    
  return searchZillow( street, city+ ' ' + state + ' ' + zip ) ;
 }
 
 public ZillowTypes.PropertySearchResponse searchZillow( String street, String City, String state ){
    
  return searchZillow( street, city+ ' ' + state ) ;
 }
 
 
 public ZillowTypes.PropertySearchResponse searchZillow( String address, String citystatezip ){
  // construct the URL  
  String endpointURL = ZillowConfig.PROPERTY_SEARCH_URL + ZillowConfig.ZWSID + '&address=' +  EncodingUtil.urlEncode(address, 'UTF-8') + '&citystatezip=' + EncodingUtil.urlEncode(citystatezip, 'UTF-8') ;      
  ZillowTypes.PropertySearchResponse searchResponse = null ;  
  try{   
   HttpResponse response = invokeZillow( 'GET', endpointURL ) ;
   XMLDom responseXML = new XMLDom( response.getBody() ) ;
   String code = responseXML.getElementByTagName('code').nodeValue ;
   if( code == ZillowTypes.CODE_SUCCESS){
    searchResponse = new ZillowTypes.PropertySearchResponse( responseXML.getElementByTagName('response') ) ;
   }
   else{
    throw new ZillowTypes.ZillowException( 'Error in Zillow response - code = '+code +' Description : ' +ZillowTypes.PropertySearchResponseCode.get(code) ); 
   }
  }
  catch( System.Exception e){
   System.debug( 'Error ' +e) ;
   throw e ;
  } 
  
  return searchResponse ;
  
 }
 
 // Web service call out 
 private HttpResponse invokeZillow( String method, String url ){    
     HttpRequest  req = new HttpRequest();   
  HttpResponse response = null;
  try {
   if( method != 'GET' ){
    throw new ZillowTypes.ZillowException('ZillowService::invokeZillow - only GET supported  '+method +' is not supported') ;
   } 
      req.setEndpoint(url); 
      req.setMethod(method) ;
   Http http = new Http();
   response = http.send(req);
  }
  catch( System.Exception e){   
    throw new ZillowTypes.ZillowException('Error sending HTTP message - ERROR: '+ e) ;
  }     
  if (response.getStatusCode() != 200) { 
   throw  new ZillowTypes.ZillowException('Error in HTTP Response - STATUS: ' +response.getStatus() + 'STATUS_CODE:'+ response.getStatusCode()) ; 
  }    
     return response ;
 }
 
 public static testmethod void basicTest() {
  try{
   ZillowService p = new ZillowService() ;
   ZillowTypes.PropertySearchResponse r = p.searchZillow( '2114 Bigelow Ave', 'Seattle, WA') ;
   Double d = r.getZEstimateAmount() ;
   String sf = r.getZSQFT() ;
   String y = r.getZYearOfHome() ;
   System.debug( '**** HOME VALUATION RETURNED = ' +d ) ;
  }
  catch( ZillowTypes.ZillowException e){
   System.debug( '**** Caught Exception' +e ) ;
  }
 }
 
}

/*****use this fragment to test from IDE or debugger


try{
ZillowService p = new ZillowService() ;
ZillowTypes.PropertySearchResponse r = p.searchZillow( '2114 Bigelow Ave', 'Seattle, WA') ;
Double d = r.getZEstimateAmount() ;
System.debug( '**** HOME VALUATION RETURNED = ' +d ) ;
}
catch( ZillowTypes.ZillowException e){
System.debug( '**** Caught Exception' +e ) ;
}
***********/