add testcase

promql_client/src/main/java/com/bdwise/prometheus/client/converter/query/DefaultQueryResult.java

@@ -18,6 +18,11 @@ public class DefaultQueryResult<T extends Data> extends Result<T>{
 	public List<T> getResult() {
 		return result;
 	}
+
+	@Override
+	public String toString() {
+		return "DefaultQueryResult [result=" + result + "]";
+	}
 	
 	
 	

promql_client/src/main/java/com/bdwise/prometheus/client/converter/query/QueryResultItemValue.java

@@ -22,7 +22,7 @@ public class QueryResultItemValue {
 	}
 	@Override
 	public String toString() {
-		return "ResultDataItemValue [timestamp=" + timestamp + ", value=" + value + "]";
+		return "QueryResultItemValue [timestamp=" + timestamp + ", value=" + value + "]";
 	}
 
 }