diff --git a/src/test/java/org/gcube/accounting/analytics/persistence/postgresql/AccountingPersistenceQueryPostgreSQLTest.java b/src/test/java/org/gcube/accounting/analytics/persistence/postgresql/AccountingPersistenceQueryPostgreSQLTest.java
index 3c167d9..1a6c32b 100644
--- a/src/test/java/org/gcube/accounting/analytics/persistence/postgresql/AccountingPersistenceQueryPostgreSQLTest.java
+++ b/src/test/java/org/gcube/accounting/analytics/persistence/postgresql/AccountingPersistenceQueryPostgreSQLTest.java
@@ -6,15 +6,19 @@ package org.gcube.accounting.analytics.persistence.postgresql;
 import java.util.ArrayList;
 import java.util.Calendar;
 import java.util.List;
+import java.util.SortedMap;
 
 import org.gcube.accounting.analytics.Filter;
+import org.gcube.accounting.analytics.Info;
 import org.gcube.accounting.analytics.TemporalConstraint;
 import org.gcube.accounting.analytics.TemporalConstraint.AggregationMode;
 import org.gcube.accounting.analytics.exception.DuplicatedKeyFilterException;
 import org.gcube.accounting.analytics.exception.KeyException;
 import org.gcube.accounting.analytics.exception.ValueException;
+import org.gcube.accounting.analytics.persistence.AccountingPersistenceBackendQueryConfiguration;
 import org.gcube.accounting.datamodel.UsageRecord;
 import org.gcube.accounting.datamodel.aggregation.AggregatedServiceUsageRecord;
+import org.junit.Before;
 import org.junit.Test;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -26,6 +30,17 @@ public class AccountingPersistenceQueryPostgreSQLTest extends ContextTest {
 	
 	private static final Logger logger = LoggerFactory.getLogger(AccountingPersistenceQueryPostgreSQLTest.class);
 	
+	protected AccountingPersistenceQueryPostgreSQL accountingPersistenceQueryPostgreSQL;
+	
+	@Before
+	public void before() throws Exception {
+		AccountingPersistenceBackendQueryConfiguration configuration = new AccountingPersistenceBackendQueryConfiguration(
+				AccountingPersistenceQueryPostgreSQL.class);
+		
+		accountingPersistenceQueryPostgreSQL = new AccountingPersistenceQueryPostgreSQL();
+		accountingPersistenceQueryPostgreSQL.prepareConnection(configuration);
+	}
+	
 	@Test
 	public void testGetNoContextTimeSeriesQuery() throws DuplicatedKeyFilterException, KeyException, ValueException, Exception {
 		logger.debug("test");
@@ -46,12 +61,8 @@ public class AccountingPersistenceQueryPostgreSQLTest extends ContextTest {
 		filters.add(filter);
 		
 		TemporalConstraint temporalConstraint = new TemporalConstraint(startTimeCalendar.getTimeInMillis(), entTimeCalendar.getTimeInMillis(), AggregationMode.MINUTELY);
-		Query query = new Query(AggregatedServiceUsageRecord.class);
-		query.setTemporalConstraint(temporalConstraint);
-		query.setFilters(filters);
-		String ret = query.getNoContextTimeSeriesQuery();
-		logger.debug(ret);
-		
+		SortedMap<Calendar, Info> timeseries = accountingPersistenceQueryPostgreSQL.getNoContextTimeSeries(AggregatedServiceUsageRecord.class, temporalConstraint, filters);
+		logger.debug("{}", timeseries);
 	}
 	
 }