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diff --git a/test/cpp/util/grpc_tool_test.cc b/test/cpp/util/grpc_tool_test.cc
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+++ b/test/cpp/util/grpc_tool_test.cc
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+/*
+ *
+ * Copyright 2016, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include "test/cpp/util/grpc_tool.h"
+
+#include <sstream>
+
+#include <grpc++/channel.h>
+#include <grpc++/client_context.h>
+#include <grpc++/create_channel.h>
+#include <grpc++/ext/proto_server_reflection_plugin.h>
+#include <grpc++/server.h>
+#include <grpc++/server_builder.h>
+#include <grpc++/server_context.h>
+#include <grpc/grpc.h>
+#include <gtest/gtest.h>
+
+#include "src/proto/grpc/testing/echo.grpc.pb.h"
+#include "src/proto/grpc/testing/echo.pb.h"
+#include "test/core/util/port.h"
+#include "test/core/util/test_config.h"
+#include "test/cpp/util/cli_credentials.h"
+#include "test/cpp/util/string_ref_helper.h"
+
+using grpc::testing::EchoRequest;
+using grpc::testing::EchoResponse;
+
+namespace grpc {
+namespace testing {
+namespace {
+
+class TestCliCredentials GRPC_FINAL : public grpc::testing::CliCredentials {
+ public:
+  std::shared_ptr<grpc::ChannelCredentials> GetCredentials() const
+      GRPC_OVERRIDE {
+    return InsecureChannelCredentials();
+  }
+  const grpc::string GetCredentialUsage() const GRPC_OVERRIDE { return ""; }
+};
+
+}  // namespame
+
+class TestServiceImpl : public ::grpc::testing::EchoTestService::Service {
+ public:
+  Status Echo(ServerContext* context, const EchoRequest* request,
+              EchoResponse* response) GRPC_OVERRIDE {
+    if (!context->client_metadata().empty()) {
+      for (std::multimap<grpc::string_ref, grpc::string_ref>::const_iterator
+               iter = context->client_metadata().begin();
+           iter != context->client_metadata().end(); ++iter) {
+        context->AddInitialMetadata(ToString(iter->first),
+                                    ToString(iter->second));
+      }
+    }
+    context->AddTrailingMetadata("trailing_key", "trailing_value");
+    response->set_message(request->message());
+    return Status::OK;
+  }
+};
+
+class GrpcToolTest : public ::testing::Test {
+ protected:
+  GrpcToolTest() {}
+
+  // SetUpServer cannot be used with EXPECT_EXIT. grpc_pick_unused_port_or_die()
+  // uses atexit() to free chosen ports, and it will spawn a new thread in
+  // resolve_address_posix.c:192 at exit time.
+  const grpc::string SetUpServer() {
+    std::ostringstream server_address;
+    int port = grpc_pick_unused_port_or_die();
+    server_address << "localhost:" << port;
+    // Setup server
+    ServerBuilder builder;
+    builder.AddListeningPort(server_address.str(), InsecureServerCredentials());
+    builder.RegisterService(&service_);
+    server_ = builder.BuildAndStart();
+    return server_address.str();
+  }
+
+  void ShutdownServer() { server_->Shutdown(); }
+
+  std::unique_ptr<Server> server_;
+  TestServiceImpl service_;
+  reflection::ProtoServerReflectionPlugin plugin_;
+};
+
+static bool PrintStream(std::stringstream* ss, const grpc::string& output) {
+  (*ss) << output << std::endl;
+  return true;
+}
+
+template <typename T>
+static size_t ArraySize(T& a) {
+  return ((sizeof(a) / sizeof(*(a))) /
+          static_cast<size_t>(!(sizeof(a) % sizeof(*(a)))));
+}
+
+#define USAGE_REGEX "(  grpc_cli .+\n){2,10}"
+
+TEST_F(GrpcToolTest, NoCommand) {
+  // Test input "grpc_cli"
+  std::stringstream output_stream;
+  const char* argv[] = {"grpc_cli"};
+  // Exit with 1, print usage instruction in stderr
+  EXPECT_EXIT(
+      GrpcToolMainLib(
+          ArraySize(argv), argv, TestCliCredentials(),
+          std::bind(PrintStream, &output_stream, std::placeholders::_1)),
+      ::testing::ExitedWithCode(1), "No command specified\n" USAGE_REGEX);
+  // No output
+  EXPECT_TRUE(0 == output_stream.tellp());
+}
+
+TEST_F(GrpcToolTest, InvalidCommand) {
+  // Test input "grpc_cli"
+  std::stringstream output_stream;
+  const char* argv[] = {"grpc_cli", "abc"};
+  // Exit with 1, print usage instruction in stderr
+  EXPECT_EXIT(
+      GrpcToolMainLib(
+          ArraySize(argv), argv, TestCliCredentials(),
+          std::bind(PrintStream, &output_stream, std::placeholders::_1)),
+      ::testing::ExitedWithCode(1), "Invalid command 'abc'\n" USAGE_REGEX);
+  // No output
+  EXPECT_TRUE(0 == output_stream.tellp());
+}
+
+TEST_F(GrpcToolTest, HelpCommand) {
+  // Test input "grpc_cli help"
+  std::stringstream output_stream;
+  const char* argv[] = {"grpc_cli", "help"};
+  // Exit with 1, print usage instruction in stderr
+  EXPECT_EXIT(GrpcToolMainLib(ArraySize(argv), argv, TestCliCredentials(),
+                              std::bind(PrintStream, &output_stream,
+                                        std::placeholders::_1)),
+              ::testing::ExitedWithCode(1), USAGE_REGEX);
+  // No output
+  EXPECT_TRUE(0 == output_stream.tellp());
+}
+
+TEST_F(GrpcToolTest, CallCommand) {
+  // Test input "grpc_cli call Echo"
+  std::stringstream output_stream;
+
+  const grpc::string server_address = SetUpServer();
+  const char* argv[] = {"grpc_cli", "call", server_address.c_str(), "Echo",
+                        "message: 'Hello'"};
+
+  EXPECT_TRUE(0 == GrpcToolMainLib(ArraySize(argv), argv, TestCliCredentials(),
+                                   std::bind(PrintStream, &output_stream,
+                                             std::placeholders::_1)));
+  // Expected output: "message: \"Hello\""
+  EXPECT_TRUE(NULL !=
+              strstr(output_stream.str().c_str(), "message: \"Hello\""));
+  ShutdownServer();
+}
+
+TEST_F(GrpcToolTest, TooFewArguments) {
+  // Test input "grpc_cli call localhost:<port> Echo "message: 'Hello'"
+  std::stringstream output_stream;
+  const char* argv[] = {"grpc_cli", "call", "Echo"};
+
+  // Exit with 1
+  EXPECT_EXIT(
+      GrpcToolMainLib(
+          ArraySize(argv), argv, TestCliCredentials(),
+          std::bind(PrintStream, &output_stream, std::placeholders::_1)),
+      ::testing::ExitedWithCode(1), ".*Wrong number of arguments for call.*");
+  // No output
+  EXPECT_TRUE(0 == output_stream.tellp());
+}
+
+TEST_F(GrpcToolTest, TooManyArguments) {
+  // Test input "grpc_cli call localhost:<port> Echo Echo "message: 'Hello'"
+  std::stringstream output_stream;
+  const char* argv[] = {"grpc_cli", "call", "localhost:10000",
+                        "Echo",     "Echo", "message: 'Hello'"};
+
+  // Exit with 1
+  EXPECT_EXIT(
+      GrpcToolMainLib(
+          ArraySize(argv), argv, TestCliCredentials(),
+          std::bind(PrintStream, &output_stream, std::placeholders::_1)),
+      ::testing::ExitedWithCode(1), ".*Wrong number of arguments for call.*");
+  // No output
+  EXPECT_TRUE(0 == output_stream.tellp());
+}
+
+}  // namespace testing
+}  // namespace grpc
+
+int main(int argc, char** argv) {
+  grpc_test_init(argc, argv);
+  ::testing::InitGoogleTest(&argc, argv);
+  ::testing::FLAGS_gtest_death_test_style = "threadsafe";
+  return RUN_ALL_TESTS();
+}