Make Spring-specific no NPE speculation to only trigger for mocks

[IlyaMuravjov]

Description

In Spring-specific unit tests class under test field can't be mocks in one execution and null in another due to @InjectMock either always injecting or non injecting the mocks into class under test.

How to test

Manual tests

• Open spring-boot-testing project.
• Generate unit tests using Mock everything outside the class strategy for the following classes.

There should be NPE tests for equals() in the following class:

@Getter @Setter @Builder @ToString @Jacksonized @NoArgsConstructor @AllArgsConstructor @Entity @EqualsAndHashCode @Table(name = "orders") public class Order { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) Long id; @Email @NotEmpty String buyer; Double price; int qty; @Override public boolean equals(Object o) { if (this == o) return true; if (o == null || !(o instanceof Order)) return false; Order order = (Order) o; return qty == order.qty && id.equals(order.id) && buyer.equals(order.buyer) && price.equals(order.price); } @Override public int hashCode() { return Objects.hash(id, buyer, price, qty); } }

There should be no NPE tests for createOrder() in the following class

@Service public class OrderService { private final OrderRepository orderRepository; public Order createOrder(Order order) { return orderRepository.save(order); } }

Self-check list

• I've set the proper labels for my PR (at least, for category and component).
• PR title and description are clear and intelligible.
• I've added enough comments to my code, particularly in hard-to-understand areas.
• The functionality I've repaired, changed or added is covered with automated tests.
• Manual tests have been provided optionally.
• The documentation for the functionality I've been working on is up-to-date.

[IlyaMuravjov]

On second thought we can't rely solely on the fact that engine decided to mock or not to mock some fields, since fuzzer may do mocking differently, so I think we should do some execution filtering after the generation has completed.

[IlyaMuravjov]

Replaced with #2617