Correct field modifiers in Spring test classes

[EgorkaKulikov]

Description

Try to generate unit or integration tests for an arbitrary Spring project.
All class fields, annotated with @InjectMocks, @Mock, @Autowired, or mockitoCloseable field are now public.

Example:

In accordance with Mockito documentation, we should (https://javadoc.io/static/org.mockito/mockito-core/3.5.6/org/mockito/MockitoAnnotations.html)

• Make @InjectMock, @Mock and @Autowired fields private
• Make mockitoCloseable variable private
• Still use public for setUp and tearDown methods.

Also it is better to locate setUp and tearDown under test methods, not above them.