JUnit Mockito returning LinkedList instead of ArrayList -

i have been tasked figure out why junit test failing. have found instead of returning arraylist (like getdeligationsforloggedinuser supposed return, returns linkedlist "userlist".

@suppresswarnings("unchecked") @test public  void test_getdelegationsforloggedinuser() {     string userid="abcd";     list<string>  expecteduserlist= new arraylist<string>();     expecteduserlist.add("efghi");     expecteduserlist.add("jklmn");     expecteduserlist.add("opqrs");      when(namedparameterjdbctemplate.queryforobject(anystring(),anymap(), any(rowmapper.class))).thenreturn(expecteduserlist);     list<string>  userlist= workflowprocessdaoimpl.getdelegationsforloggedinuser(userid);     verify(namedparameterjdbctemplate, times(1)).query(sqlcaptor.capture(), namedparametermap.capture(), rowmappercaptor.capture());     assertthat(userlist, is(expecteduserlist));     assertthat(sqlcaptor.getvalue(), is(sqlconstantssysconfigv1.getinstance().get_userids_for_delegates));  } 

does have idea why case?

you mock in test method queryforobject, test on method query.

i suppose code defines mock of function somwhere else, isn't it? result of copy/paste operation...