path: root/src/google/protobuf/compiler/ruby/ruby_generator_unittest.cc

// Protocol Buffers - Google's data interchange format
// Copyright 2014 Google Inc.  All rights reserved.
// https://developers.google.com/protocol-buffers/
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#include <memory>

#include <google/protobuf/compiler/ruby/ruby_generator.h>
#include <google/protobuf/compiler/command_line_interface.h>
#include <google/protobuf/io/zero_copy_stream.h>
#include <google/protobuf/io/printer.h>

#include <google/protobuf/testing/googletest.h>
#include <gtest/gtest.h>
#include <google/protobuf/testing/file.h>

namespace google {
namespace protobuf {
namespace compiler {
namespace python {
namespace {

class TestGenerator : public CodeGenerator {
 public:
  TestGenerator() {}
  ~TestGenerator() {}

  virtual bool Generate(const FileDescriptor* file,
                        const string& parameter,
                        GeneratorContext* context,
                        string* error) const {
    TryInsert("test_pb2.py", "imports", context);
    TryInsert("test_pb2.py", "module_scope", context);
    TryInsert("test_pb2.py", "class_scope:foo.Bar", context);
    TryInsert("test_pb2.py", "class_scope:foo.Bar.Baz", context);
    return true;
  }

  void TryInsert(const string& filename, const string& insertion_point,
                 GeneratorContext* context) const {
    google::protobuf::scoped_ptr<io::ZeroCopyOutputStream> output(
        context->OpenForInsert(filename, insertion_point));
    io::Printer printer(output.get(), '$');
    printer.Print("// inserted $name$\n", "name", insertion_point);
  }
};

// This test is a simple golden-file test over the output of the Ruby code
// generator. When we make changes to the Ruby extension and alter the Ruby code
// generator to use those changes, we should (i) manually test the output of the
// code generator with the extension, and (ii) update the golden output above.
// Some day, we may integrate build systems between protoc and the language
// extensions to the point where we can do this test in a more automated way.

TEST(RubyGeneratorTest, GeneratorTest) {
  google::protobuf::compiler::CommandLineInterface cli;
  cli.SetInputsAreProtoPathRelative(true);

  ruby::Generator ruby_generator;
  cli.RegisterGenerator("--ruby_out", &ruby_generator, "");

  string path_arg = "-I" + TestSourceDir() + "/ruby/tests";
  string ruby_out = "--ruby_out=" + TestTempDir();
  const char* argv[] = {
    "protoc",
    path_arg.c_str(),
    ruby_out.c_str(),
    "generated_code.proto",
  };

  EXPECT_EQ(0, cli.Run(4, argv));

  string output;
  GOOGLE_CHECK_OK(File::GetContents(TestTempDir() + "/generated_code.rb",
                                    &output,
                                    true));

  string expected_output;
  GOOGLE_CHECK_OK(File::GetContents(
      TestSourceDir() + "/ruby/tests/generated_code.rb",
      &expected_output,
      true));

  EXPECT_EQ(expected_output, output);
}

}  // namespace
}  // namespace python
}  // namespace compiler
}  // namespace protobuf
}  // namespace google