Cannot catch value in Java Unit Test-CodePudding

I have the following service method:

public CommandDTO update(UUID uuid, EmployeeRequest request) {
    final List<Product> productList = productRepository
            .findAllByUuidOrderByOrderNumber(uuid); 

    final List<UUID> uuidList = request.getUuidList();

    for (int i = 0; i < uuidList.size(); i  ) {        
        Product product = productList.get(i);
        product.setOrderNumber(i   1);

        // how can I get the product value in this line? 
    }

    return CommandDTO.builder().uuid(uuid).build();
}

Normally, I use ArgumentCaptor in order to get values passing to repository or service. Howevcer, in this example, the product value that I want to get after product.setOrderNumber(i 1); is not passing service or repository. For this reason I cannot get it. I am not sure if it would be possible using @Spy or doAnswer, but as far as I know, these methods cannot be used as the value is not passing to service or repo. Any idea?

CodePudding user response：

The product variable comes from productList, which in turn comes from the repository.findAllByUuidOrderByOrderNumber() method. So if you mocked your repository, you could write something like this:

Product givenProduct = new Product();
UUID givenUUID = UUID.randomUUID();
// Create an EmployeeRequest with a `uuidList`
EmployeeRequest givenRequest = new EmployeeRequest(/* TODO */); 
// Use Mockito to return a `productList` you choose
// This uses a static import of `Mockito.when()`
when(productRepository.findAllByUuidOrderByOrderNumber(givenUUID)).thenReturn(List.of(givenProduct));
service.updateRequest(givenUUID, givenRequest);

Theoretically you could even return a mocked product in the test logic above, but I suggest using a real Product object.

And now whatever happens to that product, can be asserted within your test.

For example:

// `givenProduct` is element 0, and thus will get an orderNumber of 1
assertThat(givenProduct.getOrderNumber()).isEqualTo(1);

CodePudding user response：

You can mock you repository to return list of mock's:

public test() {

    Product product1 = mock(Product.class);
    Product product2 = mock(Product.class);
    List list = Arraylist();
    list.add(product1);
    list.add(product2);

    when(productRepositoryMock.findAllByUuidOrderByOrderNumber(uuid))
       .thenReturn(list)
    when(product1).setOrderNumber(captor.capture)

In this case you can use ArgumentCaptor here, but I belive it's redundant in this case, and simple verify call will be enough

service.update(.....);

verify.(product1).setOrderNumber(value);