JUnit Testing. Type mismatch: cannot convert from Store to List<Store>

I think I miss the syntax at "thenReturn" part. What should I wrote for the source code?

here's the source code:

@Test
public void testGetUserByEmail() {
    String email = "mail";
    when(storeService.search(Mockito.anyString())).thenReturn(Mockito.any(Store.class));
    ModelAndView mav = storeController.search(email);
    Assert.assertEquals("userDetail", mav.getViewName());
}

here's the service:

public List<Store> listAllStore(){
    logger.info("Before add repository to show all");
    List<Store> all_stores=(List<Store>) storeRepo.findAll();
    logger.info("After add repository to show all");
    logger.info(all_stores);
    return all_stores;
}