fix(bigtable): mock stubs without annotations for Java 8 compatibility

Author: lqiu96

java-bigtable/google-cloud-bigtable/src/test/java/com/google/cloud/bigtable/admin/v2/BigtableInstanceAdminClientTests.java

@@ -141,7 +141,7 @@ public class BigtableInstanceAdminClientTests {
                           .build()))
           .build();
 
-  @Mock private BigtableInstanceAdminStub mockStub;
+  private BigtableInstanceAdminStub mockStub;
 
   @Mock
   private OperationCallable<
@@ -310,6 +310,8 @@ public class BigtableInstanceAdminClientTests {
 
   @Before
   public void setUp() {
+    mockStub =
+        Mockito.mock(BigtableInstanceAdminStub.class, Mockito.withSettings().withoutAnnotations());
     adminClient = BigtableInstanceAdminClient.create(PROJECT_ID, mockStub);
   }
 

java-bigtable/google-cloud-bigtable/src/test/java/com/google/cloud/bigtable/admin/v2/BigtableInstanceAdminClientV2Test.java

@@ -28,7 +28,8 @@ public class BigtableInstanceAdminClientV2Test {
 
   @Test
   public void testCreateWithStub() {
-    BigtableInstanceAdminStub mockStub = Mockito.mock(BigtableInstanceAdminStub.class);
+    BigtableInstanceAdminStub mockStub =
+        Mockito.mock(BigtableInstanceAdminStub.class, Mockito.withSettings().withoutAnnotations());
     BigtableInstanceAdminClientV2 client = new BigtableInstanceAdminClientV2(mockStub);
 
     assertThat(client).isNotNull();

java-bigtable/google-cloud-bigtable/src/test/java/com/google/cloud/bigtable/admin/v2/BigtableTableAdminClientTests.java

@@ -149,7 +149,7 @@ public class BigtableTableAdminClientTests {
       NameUtil.formatTableName(PROJECT_ID, INSTANCE_ID, TABLE_ID);
 
   private BigtableTableAdminClient adminClient;
-  @Mock private EnhancedBigtableTableAdminStub mockStub;
+  private EnhancedBigtableTableAdminStub mockStub;
 
   @Mock
   private UnaryCallable<
@@ -290,6 +290,9 @@ public class BigtableTableAdminClientTests {
 
   @Before
   public void setUp() {
+    mockStub =
+        Mockito.mock(
+            EnhancedBigtableTableAdminStub.class, Mockito.withSettings().withoutAnnotations());
     adminClient = BigtableTableAdminClient.create(PROJECT_ID, INSTANCE_ID, mockStub);
   }
 

java-bigtable/google-cloud-bigtable/src/test/java/com/google/cloud/bigtable/admin/v2/BigtableTableAdminClientV2Test.java

@@ -48,7 +48,7 @@ public class BigtableTableAdminClientV2Test {
   private static final String TABLE_NAME =
       "projects/my-project/instances/my-instance/tables/my-table";
 
-  @Mock private GrpcBigtableTableAdminStub mockStub;
+  private GrpcBigtableTableAdminStub mockStub;
 
   @Mock private AwaitConsistencyCallableV2 mockAwaitConsistencyCallable;
 
@@ -60,6 +60,8 @@ public class BigtableTableAdminClientV2Test {
 
   @Before
   public void setUp() {
+    mockStub =
+        Mockito.mock(GrpcBigtableTableAdminStub.class, Mockito.withSettings().withoutAnnotations());
     client =
         new BigtableTableAdminClientV2(
             mockStub, null, false, mockAwaitConsistencyCallable, mockOptimizeRestoredTableCallable);