ATLAS-1599: fix for unit test failure in AuditRepositoryTestBase

repository/src/test/java/org/apache/atlas/repository/audit/AuditRepositoryTestBase.java

@@ -21,6 +21,7 @@ package org.apache.atlas.repository.audit;
 import org.apache.atlas.EntityAuditEvent;
 import org.apache.atlas.typesystem.Referenceable;
 import org.apache.commons.lang.RandomStringUtils;
+import org.testng.annotations.BeforeTest;
 import org.testng.annotations.Test;
 
 import java.util.ArrayList;
@@ -36,6 +37,11 @@ public class AuditRepositoryTestBase {
         return RandomStringUtils.randomAlphanumeric(10);
     }
 
+    @BeforeTest
+    public void setUp() throws Exception{
+        eventRepository = new InMemoryEntityAuditRepository();
+    }
+
     @Test
     public void testAddEvents() throws Exception {
         EntityAuditEvent event = new EntityAuditEvent(rand(), System.currentTimeMillis(), "u1",