### Question:
GroupsServiceImpl extends BaseApiService<CloudIdentity> implements GroupsService { @Override public ListenableFuture<Group> getGroup(String groupId) throws IOException { validateGroupResourceName(groupId); Groups.Get get = service.groups().get(groupId); return batchRequest(get, retryPolicy, batchService); } private  GroupsServiceImpl(Builder builder); @Override ListenableFuture<Operation> createGroup(Group group); @Override ListenableFuture<Group> getGroup(String groupId); @Override ListenableFuture<Operation> deleteGroup(String groupId); @Override ListenableFuture<Operation> createMembership(String groupId, Membership member); @Override ListenableFuture<Membership> getMembership(String memberId); @Override ListenableFuture<Operation> deleteMembership(String memberId); @Override Iterable<Group> listGroups(String groupNamespace); @Override Iterable<Membership> listMembers(String groupId); static GroupsServiceImpl fromConfiguration(CredentialFactory credentialFactory);  }### Answer:
@Test public void testGetGroup() throws Exception { String groupId = "groups/id1"; Groups.Get getRequest = mock(Groups.Get.class); when(groups.get(groupId)).thenReturn(getRequest); Group groupToReturn = new Group().setName(groupId); doAnswer( invocation -> { AsyncRequest<Group> input = invocation.getArgument(0); setAsyncRequestResponse(input, groupToReturn); return null; }) .when(batchRequestService) .add(any()); ListenableFuture<Group> group = groupsService.getGroup(groupId); assertEquals(groupToReturn, group.get()); }