Have unit test OAuth2 authentication configured with annotations

[ch4mpy]

Summary

Default token store has no knowledge of test configured authentication

Actual Behavior

OAuth2Athentication is anonymous, whatever I try to configure it with @WithMockUser or alike

Expected Behavior

When a test is decorated with authentication meta-data, OAuth2Athentication should be set-up accordingly

linked requests

• Ease controllers unit tests in OAuth2 secured apps #6557
• @WithMockUser alike annotations for OAuth2 #6558
• reduce controllers unit tests boiler-plate code #6560

As mentioned in other requests, I ended with a solution involving a parent class for all my controllers unit tests, which mocks TokenStore so that it recognizes a specific Authorization header and creates OAuth2Authorization according to what is configured with @WithMockOAuth2Client and @WithMockOAuth2User

Sample

Overall result in controller unit tests:

@WebMvcTest(UserController.class)
@Import({ResourceServerConfig.class})
@EnableSpringDataWebSupport
public class UserControllerTest extends OAuth2ControllerTest {

    @MockBean
    UserRepository userRepo;

    @Test
    @WithMockOAuth2User(user = @WithMockUser(username = "admin", authorities = "READ_USERS"))
    public void whenAuthenticatedWithReadUserPrivilegeThenListUsersReturnsUsersPage() throws Exception {
        final List<User> users = Arrays.asList(admin, user);
        when(userRepo.findAll(any(Pageable.class))).thenAnswer(invocation ->
                new PageImpl<>(users, (Pageable) invocation.getArguments()[0], users.size()));

        api.get("/users/")
                .andExpect(status().isOk())
                .andExpect(jsonPath("$._embedded.elements", hasSize(users.size())))
                .andDo(document("users-collection",
                        ignorePage(responseFields(), "elements"),
                        links()));
    }
}

[ch4mpy]

merged 4 requests in first to better preserve the big picture of the need