code refactor

src/index.js

       delete promise['uploadProgress']
       delete promise['stateChange']
       delete promise['cancel']
-      promise.cancel = () => {
-        console.warn('finished request could not be canceled')
-      }
+      promise.cancel = () => {}
 
       if(err)
         reject(new Error(err, respInfo))

src/ios/RNFetchBlobFS.m

 # pragma mark - stat
 
 + (NSDictionary *) stat:(NSString *) path error:(NSError **) error {
-    NSMutableDictionary *stat = [[NSMutableDictionary alloc] init];
+    
     BOOL isDir = NO;
     NSFileManager * fm = [NSFileManager defaultManager];
     if([fm fileExistsAtPath:path isDirectory:&isDir] == NO) {
              @"path" : path,
              @"lastModified" : [NSString stringWithFormat:@"%d", [lastModified timeIntervalSince1970]],
              @"type" : isDir ? @"directory" : @"file"
-             };
+            };
+    
 }
 
 # pragma mark - exists

test/test-xmlhttp.js

     if(this.readyState == 4) {
       report(<Assert key="headers should be cleared by open()"
         expect={"200"}
-        actual={this.response.value}/>)
+        actual={JSON.parse(this.response).value}/>)
       done()
     }
   }
       report(
         <Assert key="reponse should correct"
           expect={time}
-          actual={Math.floor(xhr.response.time)}/>,
+          actual={Math.floor(JSON.parse(xhr.response).time)}/>,
         <Assert key="responseType should correct"
           expect={'json'}
           actual={xhr.responseType}/>)