Investigate. Spring unit tests can't support autowired collection

[tepa46]

To Reproduce

Create a project from the following classes:

1. CollectionConfig

@Configuration
public class CollectionConfig {
    @Bean
    public List<String> nameList() {
        return Arrays.asList("John", "Adam", "Harry");
    }
}

2. CollectionsService

@Component
public class CollectionsService {

    @Autowired
    private List<String> nameList;

    public int listSize(){
        return nameList.size();
    }
}

Try to generate tests for listSize method.

Expected behavior

nameList is Autowired collection. We expect to see this in the test class:

@Mock
    private List<String> nameList;

Actual behavior

@Test
    public void testListSize_ListSize() throws Exception {
        CollectionsBean collectionsBean = ((CollectionsBean) createInstance("com.rest.order.collection.CollectionsBean"));
        ArrayList arrayList = new ArrayList();
        arrayList.add(null);
        arrayList.add(null);
        arrayList.add(null);
        setField(collectionsBean, "com.rest.order.collection.CollectionsBean", "nameList", arrayList);

        int actual = collectionsBean.listSize();

        assertEquals(3, actual);
    }

Now we don't have Autowired nameList collection in the test class.

Additional context

The problem is in the following code that does not know that we need to mock current collection

val dependentMockModels =
            thisInstancesDependentModels
                .filterTo(mutableSetOf()) { cgModel ->
                    cgModel.model.isMockModel() && cgModel !in thisInstanceModels
                }

[alisevych]

At first:

• investigate how to mock Collection of elements when it is autowired
  How to extend Mock model in Symbolic engine with Spring-specific cases.
  isMock field in UtModel

[EgorkaKulikov]

The following is required #2436