Provide a way to use custom search path for gmock.h

src/compiler/cpp_generator.cc

@@ -1568,11 +1568,24 @@ grpc::string GetMockIncludes(grpc_generator::File* file,
     static const char* headers_strs[] = {
         "grpc++/impl/codegen/async_stream.h",
         "grpc++/impl/codegen/sync_stream.h",
-        "gmock/gmock.h",
     };
     std::vector<grpc::string> headers(headers_strs, array_end(headers_strs));
     PrintIncludes(printer.get(), headers, params);
 
+    std::vector<grpc::string> gmock_header;
+    if (params.gmock_search_path.empty()) {
+      gmock_header.push_back("gmock/gmock.h");
+      PrintIncludes(printer.get(), gmock_header, params);
+    } else {
+      gmock_header.push_back("gmock.h");
+      // Copy a params to generate gmock header.
+      Parameters gmock_params(params);
+      // We use local includes when a gmock_search_path is given
+      gmock_params.use_system_headers = false;
+      gmock_params.grpc_search_path = params.gmock_search_path;
+      PrintIncludes(printer.get(), gmock_header, gmock_params);
+    }
+
     if (!file->package().empty()) {
       std::vector<grpc::string> parts = file->package_parts();
 

src/compiler/cpp_generator.h

@@ -50,8 +50,10 @@ struct Parameters {
   bool use_system_headers;
   // Prefix to any grpc include
   grpc::string grpc_search_path;
-  // Generate GMOCK code to facilitate unit testing.
+  // Generate Google Mock code to facilitate unit testing.
   bool generate_mock_code;
+  // Google Mock search path, when non-empty, local includes will be used.
+  grpc::string gmock_search_path;
 };
 
 // Return the prologue of the generated header file.

src/compiler/cpp_plugin.cc

@@ -78,6 +78,8 @@ class CppGrpcGenerator : public grpc::protobuf::compiler::CodeGenerator {
             *error = grpc::string("Invalid parameter: ") + *parameter_string;
             return false;
           }
+        } else if (param[0] == "gmock_search_path") {
+          generator_parameters.gmock_search_path = param[1];
         } else {
           *error = grpc::string("Unknown parameter: ") + *parameter_string;
           return false;

test/cpp/end2end/mock_test.cc

@@ -43,7 +43,6 @@
 
 #include <iostream>
 
-using namespace std;
 using ::testing::AtLeast;
 using ::testing::DoAll;
 using ::testing::Invoke;
@@ -57,6 +56,7 @@ using grpc::testing::EchoResponse;
 using grpc::testing::EchoTestService;
 using grpc::testing::MockClientReaderWriter;
 using std::chrono::system_clock;
+using std::vector;
 
 namespace grpc {
 namespace testing {