Revert MockitoRule

Author: sergiitk

core/src/test/java/io/grpc/internal/ServerImplTest.java

@@ -112,8 +112,7 @@
 import org.mockito.Captor;
 import org.mockito.InOrder;
 import org.mockito.Mock;
-import org.mockito.junit.MockitoJUnit;
-import org.mockito.junit.MockitoRule;
+import org.mockito.MockitoAnnotations;
 
 /** Unit tests for {@link ServerImpl}. */
 @RunWith(JUnit4.class)
@@ -140,7 +139,6 @@ public boolean shouldAccept(Runnable runnable) {
       };
   private static final String AUTHORITY = "some_authority";
 
-  @Rule public final MockitoRule mocks = MockitoJUnit.rule();
   @Rule public final ExpectedException thrown = ExpectedException.none();
 
   @BeforeClass
@@ -164,9 +162,11 @@ public Context filterContext(Context context) {
         return newCtx.withValue(SERVER_TRACER_ADDED_KEY, "context added by tracer");
       }
     };
-  @Mock private ObjectPool<Executor> executorPool;
-  @Mock private ClientTransportServersBuilder mockClientTransportServersBuilder;
+  @Mock
+  private ObjectPool<Executor> executorPool;
   private ServerImplBuilder builder;
+  @Mock
+  private ClientTransportServersBuilder mockClientTransportServersBuilder;
   private MutableHandlerRegistry mutableFallbackRegistry = new MutableHandlerRegistry();
   private HandlerRegistry fallbackRegistry = mock(
       HandlerRegistry.class,
@@ -202,6 +202,7 @@ public List<ServerServiceDefinition> getServices() {
   /** Set up for test. */
   @Before
   public void startUp() throws IOException {
+    MockitoAnnotations.initMocks(this);
     builder = new ServerImplBuilder(mockClientTransportServersBuilder);
     builder.channelz = channelz;
     builder.ticker = timer.getDeadlineTicker();