improve test

Author: Yingjian Wu

metacat-functional-tests/src/functionalTest/groovy/com/netflix/metacat/ParentChildRelMetadataServiceSpec.groovy

@@ -167,6 +167,7 @@ class ParentChildRelMetadataServiceSpec extends Specification{
         def grandChild = QualifiedName.ofTable(catalog, database, "gc")
         def grandChildUUID = "gc_uuid"
         def type = "clone"
+        service.createParentChildRelation(parent, parentUUID, child, childUUID, type)
 
         when:
         service.createParentChildRelation(child, childUUID, grandChild, grandChildUUID, type)
@@ -453,6 +454,7 @@ class ParentChildRelMetadataServiceSpec extends Specification{
         when:
         service.rename(child2, child1)
         then:
+        e = thrown(Exception)
         assert e.message.contains("is already a child table")
 
         //Test p1