fixed RelationCacheTest

dao/src/test/java/org/thingsboard/server/dao/service/RelationCacheTest.java

@@ -85,8 +85,12 @@ public class RelationCacheTest extends AbstractServiceTest {
 
     @Test
     public void testDeleteRelations_EvictsCache() {
+        EntityRelation relation = new EntityRelation(ENTITY_ID_FROM, ENTITY_ID_TO, RELATION_TYPE);
         when(relationDao.getRelation(SYSTEM_TENANT_ID, ENTITY_ID_FROM, ENTITY_ID_TO, RELATION_TYPE, RelationTypeGroup.COMMON))
-                .thenReturn(new EntityRelation(ENTITY_ID_FROM, ENTITY_ID_TO, RELATION_TYPE));
+                .thenReturn(relation);
+
+        when(relationDao.deleteRelation(SYSTEM_TENANT_ID, ENTITY_ID_FROM, ENTITY_ID_TO, RELATION_TYPE, RelationTypeGroup.COMMON))
+                .thenReturn(relation);
 
         relationService.getRelation(SYSTEM_TENANT_ID, ENTITY_ID_FROM, ENTITY_ID_TO, RELATION_TYPE, RelationTypeGroup.COMMON);
         relationService.getRelation(SYSTEM_TENANT_ID, ENTITY_ID_FROM, ENTITY_ID_TO, RELATION_TYPE, RelationTypeGroup.COMMON);