Added manual tag and buildtest example

examples/objective-c/BUILD

@@ -23,6 +23,7 @@ objc_grpc_library(
     name = "HelloWorld_grpc_proto",
     srcs = ["//examples:protos/helloworld.proto"],
     deps = ["//examples:helloworld_proto"],
+    tags = ["manual"],
 )
 
 # This one works with import "external/com_github_grpc_grpc/examples/protos/Helloworld.pbrpc.h"
@@ -30,6 +31,7 @@ objc_grpc_library(
     name = "HelloWorld_grpc_proto_external",
     srcs = ["//external/com_github_grpc_grpc/examples:protos/helloworld.proto"],
     deps = ["@com_github_grpc_grpc//examples:helloworld_proto"],
+    tags = ["manual"],
 )
 
 objc_library(
@@ -42,6 +44,7 @@ objc_library(
     ]),
     includes = ["helloworld/HelloWorld"],
     deps = [":HelloWorld_grpc_proto"],
+    tags = ["manual"],
 )
 
 ios_application(
@@ -54,4 +57,5 @@ ios_application(
     minimum_os_version = "8.0",
     infoplists = ["helloworld/HelloWorld/Info.plist"],
     deps = [":HelloWorld-lib"],
+    tags = ["manual"],
 )

test/build_test/BUILD

@@ -0,0 +1,28 @@
+# Copyright 2019 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+licenses(["notice"])
+
+package(default_visibility = ["//visibility:public"])
+
+load("@bazel_skylib//rules:build_test.bzl", "build_test")
+
+# build test //test/build_test:objective_c_examples_test
+build_test(
+    name = "objective_c_examples_test",
+    targets = [
+        "//examples/objective-c:HelloWorld",
+    ],
+    tags = ["manual"],
+)