Mocking Iterable with List using Mockito

Hi all,
I want to create a test for the following code:
public List<CustomerDto> getAll() {
Iterable<Customer> ups = dao.findAll();
List<CustomerDto> dtos = new ArrayList<>();
for (Customer entity : ups) {
dtos.add(mapper.map(entity, CustomerDto.class));
}
return dtos;
}

Can you please let me know how to mock Iterable with List using Mockito?

So far I have the following code:

@Test
public void testGetAll(){
CustomerDto customerDto = mock(CustomerDto.class);
Iterable<Customer> customerIterator = mockCustomerDao.findAll();

when(mockMapper.map(eq(CustomerDto.class), same(Customer.class)))
.thenReturn(new Customer());
}

P.S. I'm using Dozer Java Bean.
Interface CustomerDao extends ElasticsearchCrudRepository<Customer, String>