Reintroduced golden_file_test

3 files changed, 426 insertions, 0 deletions

diff --git a/test/cpp/codegen/BUILD b/test/cpp/codegen/BUILD
index 53f148c413..14d5733da2 100644
--- a/test/cpp/codegen/BUILD
+++ b/test/cpp/codegen/BUILD
@@ -58,3 +58,20 @@ cc_test(
         "//test/core/util:gpr_test_util",
     ],
 )
+
+cc_test(
+    name = "golden_file_test",
+    srcs = ["golden_file_test.cc"],
+    args = ["--generated_file_path=$(GENDIR)/src/proto/grpc/testing/compiler_test.grpc.pb.h"],
+    data = [
+        ":compiler_test_golden",
+        "//src/proto/grpc/testing:_compiler_test_proto_grpc_codegen",
+    ],
+    deps = [
+        "//:grpc++",
+        "//external:gflags",
+        "//external:gtest",
+        "//src/proto/grpc/testing:compiler_test_proto",
+        "//test/core/util:gpr_test_util",
+    ],
+)
diff --git a/test/cpp/codegen/compiler_test_golden b/test/cpp/codegen/compiler_test_golden
new file mode 100644
index 0000000000..0b82f2a59f
--- /dev/null
+++ b/test/cpp/codegen/compiler_test_golden
@@ -0,0 +1,341 @@
+// Generated by the gRPC protobuf plugin.
+// If you make any local change, they will be lost.
+// source: src/proto/grpc/testing/compiler_test.proto
+// Original file comments:
+// 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.
+//
+// File detached comment 1
+//
+// File detached comment 2
+//
+// File leading comment 1
+#ifndef GRPC_src_2fproto_2fgrpc_2ftesting_2fcompiler_5ftest_2eproto__INCLUDED
+#define GRPC_src_2fproto_2fgrpc_2ftesting_2fcompiler_5ftest_2eproto__INCLUDED
+
+#include "src/proto/grpc/testing/compiler_test.pb.h"
+
+#include <grpc++/impl/codegen/async_stream.h>
+#include <grpc++/impl/codegen/async_unary_call.h>
+#include <grpc++/impl/codegen/method_handler_impl.h>
+#include <grpc++/impl/codegen/proto_utils.h>
+#include <grpc++/impl/codegen/rpc_method.h>
+#include <grpc++/impl/codegen/service_type.h>
+#include <grpc++/impl/codegen/status.h>
+#include <grpc++/impl/codegen/stub_options.h>
+#include <grpc++/impl/codegen/sync_stream.h>
+
+namespace grpc {
+class CompletionQueue;
+class Channel;
+class RpcService;
+class ServerCompletionQueue;
+class ServerContext;
+}  // namespace grpc
+
+namespace grpc {
+namespace testing {
+
+// ServiceA detached comment 1
+//
+// ServiceA detached comment 2
+//
+// ServiceA leading comment 1
+class ServiceA final {
+ public:
+  class StubInterface {
+   public:
+    virtual ~StubInterface() {}
+    // MethodA1 leading comment 1
+    virtual ::grpc::Status MethodA1(::grpc::ClientContext* context, const ::grpc::testing::Request& request, ::grpc::testing::Response* response) = 0;
+    std::unique_ptr< ::grpc::ClientAsyncResponseReaderInterface< ::grpc::testing::Response>> AsyncMethodA1(::grpc::ClientContext* context, const ::grpc::testing::Request& request, ::grpc::CompletionQueue* cq) {
+      return std::unique_ptr< ::grpc::ClientAsyncResponseReaderInterface< ::grpc::testing::Response>>(AsyncMethodA1Raw(context, request, cq));
+    }
+    // MethodA1 trailing comment 1
+    // MethodA2 detached leading comment 1
+    //
+    // Method A2 leading comment 1
+    // Method A2 leading comment 2
+    std::unique_ptr< ::grpc::ClientWriterInterface< ::grpc::testing::Request>> MethodA2(::grpc::ClientContext* context, ::grpc::testing::Response* response) {
+      return std::unique_ptr< ::grpc::ClientWriterInterface< ::grpc::testing::Request>>(MethodA2Raw(context, response));
+    }
+    std::unique_ptr< ::grpc::ClientAsyncWriterInterface< ::grpc::testing::Request>> AsyncMethodA2(::grpc::ClientContext* context, ::grpc::testing::Response* response, ::grpc::CompletionQueue* cq, void* tag) {
+      return std::unique_ptr< ::grpc::ClientAsyncWriterInterface< ::grpc::testing::Request>>(AsyncMethodA2Raw(context, response, cq, tag));
+    }
+    // MethodA2 trailing comment 1
+  private:
+    virtual ::grpc::ClientAsyncResponseReaderInterface< ::grpc::testing::Response>* AsyncMethodA1Raw(::grpc::ClientContext* context, const ::grpc::testing::Request& request, ::grpc::CompletionQueue* cq) = 0;
+    virtual ::grpc::ClientWriterInterface< ::grpc::testing::Request>* MethodA2Raw(::grpc::ClientContext* context, ::grpc::testing::Response* response) = 0;
+    virtual ::grpc::ClientAsyncWriterInterface< ::grpc::testing::Request>* AsyncMethodA2Raw(::grpc::ClientContext* context, ::grpc::testing::Response* response, ::grpc::CompletionQueue* cq, void* tag) = 0;
+  };
+  class Stub final : public StubInterface {
+   public:
+    Stub(const std::shared_ptr< ::grpc::ChannelInterface>& channel);
+    ::grpc::Status MethodA1(::grpc::ClientContext* context, const ::grpc::testing::Request& request, ::grpc::testing::Response* response) override;
+    std::unique_ptr< ::grpc::ClientAsyncResponseReader< ::grpc::testing::Response>> AsyncMethodA1(::grpc::ClientContext* context, const ::grpc::testing::Request& request, ::grpc::CompletionQueue* cq) {
+      return std::unique_ptr< ::grpc::ClientAsyncResponseReader< ::grpc::testing::Response>>(AsyncMethodA1Raw(context, request, cq));
+    }
+    std::unique_ptr< ::grpc::ClientWriter< ::grpc::testing::Request>> MethodA2(::grpc::ClientContext* context, ::grpc::testing::Response* response) {
+      return std::unique_ptr< ::grpc::ClientWriter< ::grpc::testing::Request>>(MethodA2Raw(context, response));
+    }
+    std::unique_ptr< ::grpc::ClientAsyncWriter< ::grpc::testing::Request>> AsyncMethodA2(::grpc::ClientContext* context, ::grpc::testing::Response* response, ::grpc::CompletionQueue* cq, void* tag) {
+      return std::unique_ptr< ::grpc::ClientAsyncWriter< ::grpc::testing::Request>>(AsyncMethodA2Raw(context, response, cq, tag));
+    }
+
+   private:
+    std::shared_ptr< ::grpc::ChannelInterface> channel_;
+    ::grpc::ClientAsyncResponseReader< ::grpc::testing::Response>* AsyncMethodA1Raw(::grpc::ClientContext* context, const ::grpc::testing::Request& request, ::grpc::CompletionQueue* cq) override;
+    ::grpc::ClientWriter< ::grpc::testing::Request>* MethodA2Raw(::grpc::ClientContext* context, ::grpc::testing::Response* response) override;
+    ::grpc::ClientAsyncWriter< ::grpc::testing::Request>* AsyncMethodA2Raw(::grpc::ClientContext* context, ::grpc::testing::Response* response, ::grpc::CompletionQueue* cq, void* tag) override;
+    const ::grpc::RpcMethod rpcmethod_MethodA1_;
+    const ::grpc::RpcMethod rpcmethod_MethodA2_;
+  };
+  static std::unique_ptr<Stub> NewStub(const std::shared_ptr< ::grpc::ChannelInterface>& channel, const ::grpc::StubOptions& options = ::grpc::StubOptions());
+
+  class Service : public ::grpc::Service {
+   public:
+    Service();
+    virtual ~Service();
+    // MethodA1 leading comment 1
+    virtual ::grpc::Status MethodA1(::grpc::ServerContext* context, const ::grpc::testing::Request* request, ::grpc::testing::Response* response);
+    // MethodA1 trailing comment 1
+    // MethodA2 detached leading comment 1
+    //
+    // Method A2 leading comment 1
+    // Method A2 leading comment 2
+    virtual ::grpc::Status MethodA2(::grpc::ServerContext* context, ::grpc::ServerReader< ::grpc::testing::Request>* reader, ::grpc::testing::Response* response);
+    // MethodA2 trailing comment 1
+  };
+  template <class BaseClass>
+  class WithAsyncMethod_MethodA1 : public BaseClass {
+   private:
+    void BaseClassMustBeDerivedFromService(const Service *service) {}
+   public:
+    WithAsyncMethod_MethodA1() {
+      ::grpc::Service::MarkMethodAsync(0);
+    }
+    ~WithAsyncMethod_MethodA1() override {
+      BaseClassMustBeDerivedFromService(this);
+    }
+    // disable synchronous version of this method
+    ::grpc::Status MethodA1(::grpc::ServerContext* context, const ::grpc::testing::Request* request, ::grpc::testing::Response* response) final override {
+      abort();
+      return ::grpc::Status(::grpc::StatusCode::UNIMPLEMENTED, "");
+    }
+    void RequestMethodA1(::grpc::ServerContext* context, ::grpc::testing::Request* request, ::grpc::ServerAsyncResponseWriter< ::grpc::testing::Response>* response, ::grpc::CompletionQueue* new_call_cq, ::grpc::ServerCompletionQueue* notification_cq, void *tag) {
+      ::grpc::Service::RequestAsyncUnary(0, context, request, response, new_call_cq, notification_cq, tag);
+    }
+  };
+  template <class BaseClass>
+  class WithAsyncMethod_MethodA2 : public BaseClass {
+   private:
+    void BaseClassMustBeDerivedFromService(const Service *service) {}
+   public:
+    WithAsyncMethod_MethodA2() {
+      ::grpc::Service::MarkMethodAsync(1);
+    }
+    ~WithAsyncMethod_MethodA2() override {
+      BaseClassMustBeDerivedFromService(this);
+    }
+    // disable synchronous version of this method
+    ::grpc::Status MethodA2(::grpc::ServerContext* context, ::grpc::ServerReader< ::grpc::testing::Request>* reader, ::grpc::testing::Response* response) final override {
+      abort();
+      return ::grpc::Status(::grpc::StatusCode::UNIMPLEMENTED, "");
+    }
+    void RequestMethodA2(::grpc::ServerContext* context, ::grpc::ServerAsyncReader< ::grpc::testing::Response, ::grpc::testing::Request>* reader, ::grpc::CompletionQueue* new_call_cq, ::grpc::ServerCompletionQueue* notification_cq, void *tag) {
+      ::grpc::Service::RequestAsyncClientStreaming(1, context, reader, new_call_cq, notification_cq, tag);
+    }
+  };
+  typedef WithAsyncMethod_MethodA1<WithAsyncMethod_MethodA2<Service > > AsyncService;
+  template <class BaseClass>
+  class WithGenericMethod_MethodA1 : public BaseClass {
+   private:
+    void BaseClassMustBeDerivedFromService(const Service *service) {}
+   public:
+    WithGenericMethod_MethodA1() {
+      ::grpc::Service::MarkMethodGeneric(0);
+    }
+    ~WithGenericMethod_MethodA1() override {
+      BaseClassMustBeDerivedFromService(this);
+    }
+    // disable synchronous version of this method
+    ::grpc::Status MethodA1(::grpc::ServerContext* context, const ::grpc::testing::Request* request, ::grpc::testing::Response* response) final override {
+      abort();
+      return ::grpc::Status(::grpc::StatusCode::UNIMPLEMENTED, "");
+    }
+  };
+  template <class BaseClass>
+  class WithGenericMethod_MethodA2 : public BaseClass {
+   private:
+    void BaseClassMustBeDerivedFromService(const Service *service) {}
+   public:
+    WithGenericMethod_MethodA2() {
+      ::grpc::Service::MarkMethodGeneric(1);
+    }
+    ~WithGenericMethod_MethodA2() override {
+      BaseClassMustBeDerivedFromService(this);
+    }
+    // disable synchronous version of this method
+    ::grpc::Status MethodA2(::grpc::ServerContext* context, ::grpc::ServerReader< ::grpc::testing::Request>* reader, ::grpc::testing::Response* response) final override {
+      abort();
+      return ::grpc::Status(::grpc::StatusCode::UNIMPLEMENTED, "");
+    }
+  };
+  template <class BaseClass>
+  class WithStreamedUnaryMethod_MethodA1 : public BaseClass {
+   private:
+    void BaseClassMustBeDerivedFromService(const Service *service) {}
+   public:
+    WithStreamedUnaryMethod_MethodA1() {
+      ::grpc::Service::MarkMethodStreamed(0,
+        new ::grpc::StreamedUnaryHandler< ::grpc::testing::Request, ::grpc::testing::Response>(std::bind(&WithStreamedUnaryMethod_MethodA1<BaseClass>::StreamedMethodA1, this, std::placeholders::_1, std::placeholders::_2)));
+    }
+    ~WithStreamedUnaryMethod_MethodA1() override {
+      BaseClassMustBeDerivedFromService(this);
+    }
+    // disable regular version of this method
+    ::grpc::Status MethodA1(::grpc::ServerContext* context, const ::grpc::testing::Request* request, ::grpc::testing::Response* response) final override {
+      abort();
+      return ::grpc::Status(::grpc::StatusCode::UNIMPLEMENTED, "");
+    }
+    // replace default version of method with streamed unary
+    virtual ::grpc::Status StreamedMethodA1(::grpc::ServerContext* context, ::grpc::ServerUnaryStreamer< ::grpc::testing::Request,::grpc::testing::Response>* server_unary_streamer) = 0;
+  };
+  typedef WithStreamedUnaryMethod_MethodA1<Service > StreamedUnaryService;
+  typedef Service SplitStreamedService;
+  typedef WithStreamedUnaryMethod_MethodA1<Service > StreamedService;
+};
+
+// ServiceB leading comment 1
+class ServiceB final {
+ public:
+  class StubInterface {
+   public:
+    virtual ~StubInterface() {}
+    // MethodB1 leading comment 1
+    virtual ::grpc::Status MethodB1(::grpc::ClientContext* context, const ::grpc::testing::Request& request, ::grpc::testing::Response* response) = 0;
+    std::unique_ptr< ::grpc::ClientAsyncResponseReaderInterface< ::grpc::testing::Response>> AsyncMethodB1(::grpc::ClientContext* context, const ::grpc::testing::Request& request, ::grpc::CompletionQueue* cq) {
+      return std::unique_ptr< ::grpc::ClientAsyncResponseReaderInterface< ::grpc::testing::Response>>(AsyncMethodB1Raw(context, request, cq));
+    }
+    // MethodB1 trailing comment 1
+  private:
+    virtual ::grpc::ClientAsyncResponseReaderInterface< ::grpc::testing::Response>* AsyncMethodB1Raw(::grpc::ClientContext* context, const ::grpc::testing::Request& request, ::grpc::CompletionQueue* cq) = 0;
+  };
+  class Stub final : public StubInterface {
+   public:
+    Stub(const std::shared_ptr< ::grpc::ChannelInterface>& channel);
+    ::grpc::Status MethodB1(::grpc::ClientContext* context, const ::grpc::testing::Request& request, ::grpc::testing::Response* response) override;
+    std::unique_ptr< ::grpc::ClientAsyncResponseReader< ::grpc::testing::Response>> AsyncMethodB1(::grpc::ClientContext* context, const ::grpc::testing::Request& request, ::grpc::CompletionQueue* cq) {
+      return std::unique_ptr< ::grpc::ClientAsyncResponseReader< ::grpc::testing::Response>>(AsyncMethodB1Raw(context, request, cq));
+    }
+
+   private:
+    std::shared_ptr< ::grpc::ChannelInterface> channel_;
+    ::grpc::ClientAsyncResponseReader< ::grpc::testing::Response>* AsyncMethodB1Raw(::grpc::ClientContext* context, const ::grpc::testing::Request& request, ::grpc::CompletionQueue* cq) override;
+    const ::grpc::RpcMethod rpcmethod_MethodB1_;
+  };
+  static std::unique_ptr<Stub> NewStub(const std::shared_ptr< ::grpc::ChannelInterface>& channel, const ::grpc::StubOptions& options = ::grpc::StubOptions());
+
+  class Service : public ::grpc::Service {
+   public:
+    Service();
+    virtual ~Service();
+    // MethodB1 leading comment 1
+    virtual ::grpc::Status MethodB1(::grpc::ServerContext* context, const ::grpc::testing::Request* request, ::grpc::testing::Response* response);
+    // MethodB1 trailing comment 1
+  };
+  template <class BaseClass>
+  class WithAsyncMethod_MethodB1 : public BaseClass {
+   private:
+    void BaseClassMustBeDerivedFromService(const Service *service) {}
+   public:
+    WithAsyncMethod_MethodB1() {
+      ::grpc::Service::MarkMethodAsync(0);
+    }
+    ~WithAsyncMethod_MethodB1() override {
+      BaseClassMustBeDerivedFromService(this);
+    }
+    // disable synchronous version of this method
+    ::grpc::Status MethodB1(::grpc::ServerContext* context, const ::grpc::testing::Request* request, ::grpc::testing::Response* response) final override {
+      abort();
+      return ::grpc::Status(::grpc::StatusCode::UNIMPLEMENTED, "");
+    }
+    void RequestMethodB1(::grpc::ServerContext* context, ::grpc::testing::Request* request, ::grpc::ServerAsyncResponseWriter< ::grpc::testing::Response>* response, ::grpc::CompletionQueue* new_call_cq, ::grpc::ServerCompletionQueue* notification_cq, void *tag) {
+      ::grpc::Service::RequestAsyncUnary(0, context, request, response, new_call_cq, notification_cq, tag);
+    }
+  };
+  typedef WithAsyncMethod_MethodB1<Service > AsyncService;
+  template <class BaseClass>
+  class WithGenericMethod_MethodB1 : public BaseClass {
+   private:
+    void BaseClassMustBeDerivedFromService(const Service *service) {}
+   public:
+    WithGenericMethod_MethodB1() {
+      ::grpc::Service::MarkMethodGeneric(0);
+    }
+    ~WithGenericMethod_MethodB1() override {
+      BaseClassMustBeDerivedFromService(this);
+    }
+    // disable synchronous version of this method
+    ::grpc::Status MethodB1(::grpc::ServerContext* context, const ::grpc::testing::Request* request, ::grpc::testing::Response* response) final override {
+      abort();
+      return ::grpc::Status(::grpc::StatusCode::UNIMPLEMENTED, "");
+    }
+  };
+  template <class BaseClass>
+  class WithStreamedUnaryMethod_MethodB1 : public BaseClass {
+   private:
+    void BaseClassMustBeDerivedFromService(const Service *service) {}
+   public:
+    WithStreamedUnaryMethod_MethodB1() {
+      ::grpc::Service::MarkMethodStreamed(0,
+        new ::grpc::StreamedUnaryHandler< ::grpc::testing::Request, ::grpc::testing::Response>(std::bind(&WithStreamedUnaryMethod_MethodB1<BaseClass>::StreamedMethodB1, this, std::placeholders::_1, std::placeholders::_2)));
+    }
+    ~WithStreamedUnaryMethod_MethodB1() override {
+      BaseClassMustBeDerivedFromService(this);
+    }
+    // disable regular version of this method
+    ::grpc::Status MethodB1(::grpc::ServerContext* context, const ::grpc::testing::Request* request, ::grpc::testing::Response* response) final override {
+      abort();
+      return ::grpc::Status(::grpc::StatusCode::UNIMPLEMENTED, "");
+    }
+    // replace default version of method with streamed unary
+    virtual ::grpc::Status StreamedMethodB1(::grpc::ServerContext* context, ::grpc::ServerUnaryStreamer< ::grpc::testing::Request,::grpc::testing::Response>* server_unary_streamer) = 0;
+  };
+  typedef WithStreamedUnaryMethod_MethodB1<Service > StreamedUnaryService;
+  typedef Service SplitStreamedService;
+  typedef WithStreamedUnaryMethod_MethodB1<Service > StreamedService;
+};
+// ServiceB trailing comment 1
+
+}  // namespace testing
+}  // namespace grpc
+
+
+#endif  // GRPC_src_2fproto_2fgrpc_2ftesting_2fcompiler_5ftest_2eproto__INCLUDED
diff --git a/test/cpp/codegen/golden_file_test.cc b/test/cpp/codegen/golden_file_test.cc
new file mode 100644
index 0000000000..158a4d933c
--- /dev/null
+++ b/test/cpp/codegen/golden_file_test.cc
@@ -0,0 +1,68 @@
+/*
+ *
+ * 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 <fstream>
+#include <sstream>
+
+#include <gflags/gflags.h>
+#include <gtest/gtest.h>
+
+DEFINE_string(generated_file_path, "",
+              "path to the generated compiler_test.grpc.pb.h file");
+
+const char kGoldenFilePath[] = "test/cpp/codegen/compiler_test_golden";
+
+TEST(GoldenFileTest, TestGeneratedFile) {
+  ASSERT_FALSE(FLAGS_generated_file_path.empty());
+
+  std::ifstream generated(FLAGS_generated_file_path);
+  std::ifstream golden(kGoldenFilePath);
+
+  ASSERT_TRUE(generated.good());
+  ASSERT_TRUE(golden.good());
+
+  std::ostringstream gen_oss;
+  std::ostringstream gold_oss;
+  gen_oss << generated.rdbuf();
+  gold_oss << golden.rdbuf();
+  EXPECT_EQ(gold_oss.str(), gen_oss.str());
+
+  generated.close();
+  golden.close();
+}
+
+int main(int argc, char **argv) {
+  ::testing::InitGoogleTest(&argc, argv);
+  ::google::ParseCommandLineFlags(&argc, &argv, true);
+  return RUN_ALL_TESTS();
+}