expecting_objectwriter.h

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#ifndef GOOGLE_PROTOBUF_UTIL_CONVERTER_EXPECTING_OBJECTWRITER_H__
#define GOOGLE_PROTOBUF_UTIL_CONVERTER_EXPECTING_OBJECTWRITER_H__

// An implementation of ObjectWriter that automatically sets the
// gmock expectations for the response to a method. Every method
// returns the object itself for chaining.
//
// Usage:
//   // Setup
//   MockObjectWriter mock;
//   ExpectingObjectWriter ow(&mock);
//
//   // Set expectation
//   ow.StartObject("")
//       ->RenderString("key", "value")
//     ->EndObject();
//
//   // Actual testing
//   mock.StartObject(StringPiece())
//         ->RenderString("key", "value")
//       ->EndObject();

#include <google/protobuf/stubs/common.h>
#include <google/protobuf/util/internal/object_writer.h>
#include <gmock/gmock.h>

namespace google {
namespace protobuf {
namespace util {
namespace converter {

using testing::IsEmpty;
using testing::NanSensitiveDoubleEq;
using testing::NanSensitiveFloatEq;
using testing::Return;
using testing::StrEq;
using testing::TypedEq;

class MockObjectWriter : public ObjectWriter {
 public:
  MockObjectWriter() {}

  MOCK_METHOD1(StartObject, ObjectWriter*(StringPiece));
  MOCK_METHOD0(EndObject, ObjectWriter*());
  MOCK_METHOD1(StartList, ObjectWriter*(StringPiece));
  MOCK_METHOD0(EndList, ObjectWriter*());
  MOCK_METHOD2(RenderBool, ObjectWriter*(StringPiece, bool));
  MOCK_METHOD2(RenderInt32, ObjectWriter*(StringPiece, int32));
  MOCK_METHOD2(RenderUint32, ObjectWriter*(StringPiece, uint32));
  MOCK_METHOD2(RenderInt64, ObjectWriter*(StringPiece, int64));
  MOCK_METHOD2(RenderUint64, ObjectWriter*(StringPiece, uint64));
  MOCK_METHOD2(RenderDouble, ObjectWriter*(StringPiece, double));
  MOCK_METHOD2(RenderFloat, ObjectWriter*(StringPiece, float));
  MOCK_METHOD2(RenderString, ObjectWriter*(StringPiece, StringPiece));
  MOCK_METHOD2(RenderBytes, ObjectWriter*(StringPiece, StringPiece));
  MOCK_METHOD1(RenderNull, ObjectWriter*(StringPiece));
};

class ExpectingObjectWriter : public ObjectWriter {
 public:
  explicit ExpectingObjectWriter(MockObjectWriter* mock) : mock_(mock) {}

  virtual ObjectWriter* StartObject(StringPiece name) {
    (name.empty()
         ? EXPECT_CALL(*mock_, StartObject(IsEmpty()))
         : EXPECT_CALL(*mock_, StartObject(StrEq(name.ToString()))))
        .WillOnce(Return(mock_))
        .RetiresOnSaturation();
    return this;
  }

  virtual ObjectWriter* EndObject() {
    EXPECT_CALL(*mock_, EndObject())
        .WillOnce(Return(mock_))
        .RetiresOnSaturation();
    return this;
  }

  virtual ObjectWriter* StartList(StringPiece name) {
    (name.empty()
         ? EXPECT_CALL(*mock_, StartList(IsEmpty()))
         : EXPECT_CALL(*mock_, StartList(StrEq(name.ToString()))))
        .WillOnce(Return(mock_))
        .RetiresOnSaturation();
    return this;
  }

  virtual ObjectWriter* EndList() {
    EXPECT_CALL(*mock_, EndList())
        .WillOnce(Return(mock_))
        .RetiresOnSaturation();
    return this;
  }

  virtual ObjectWriter* RenderBool(StringPiece name, bool value) {
    (name.empty()
         ? EXPECT_CALL(*mock_, RenderBool(IsEmpty(), TypedEq<bool>(value)))
         : EXPECT_CALL(*mock_, RenderBool(StrEq(name.ToString()),
                                          TypedEq<bool>(value))))
        .WillOnce(Return(mock_))
        .RetiresOnSaturation();
    return this;
  }

  virtual ObjectWriter* RenderInt32(StringPiece name, int32 value) {
    (name.empty()
         ? EXPECT_CALL(*mock_, RenderInt32(IsEmpty(), TypedEq<int32>(value)))
         : EXPECT_CALL(*mock_, RenderInt32(StrEq(name.ToString()),
                                           TypedEq<int32>(value))))
        .WillOnce(Return(mock_))
        .RetiresOnSaturation();
    return this;
  }

  virtual ObjectWriter* RenderUint32(StringPiece name, uint32 value) {
    (name.empty()
         ? EXPECT_CALL(*mock_, RenderUint32(IsEmpty(), TypedEq<uint32>(value)))
         : EXPECT_CALL(*mock_, RenderUint32(StrEq(name.ToString()),
                                            TypedEq<uint32>(value))))
        .WillOnce(Return(mock_))
        .RetiresOnSaturation();
    return this;
  }

  virtual ObjectWriter* RenderInt64(StringPiece name, int64 value) {
    (name.empty()
         ? EXPECT_CALL(*mock_, RenderInt64(IsEmpty(), TypedEq<int64>(value)))
         : EXPECT_CALL(*mock_, RenderInt64(StrEq(name.ToString()),
                                           TypedEq<int64>(value))))
        .WillOnce(Return(mock_))
        .RetiresOnSaturation();
    return this;
  }

  virtual ObjectWriter* RenderUint64(StringPiece name, uint64 value) {
    (name.empty()
         ? EXPECT_CALL(*mock_, RenderUint64(IsEmpty(), TypedEq<uint64>(value)))
         : EXPECT_CALL(*mock_, RenderUint64(StrEq(name.ToString()),
                                            TypedEq<uint64>(value))))
        .WillOnce(Return(mock_))
        .RetiresOnSaturation();
    return this;
  }

  virtual ObjectWriter* RenderDouble(StringPiece name, double value) {
    (name.empty()
         ? EXPECT_CALL(*mock_, RenderDouble(IsEmpty(),
                                            NanSensitiveDoubleEq(value)))
         : EXPECT_CALL(*mock_, RenderDouble(StrEq(name.ToString()),
                                            NanSensitiveDoubleEq(value))))
        .WillOnce(Return(mock_))
        .RetiresOnSaturation();
    return this;
  }

  virtual ObjectWriter* RenderFloat(StringPiece name, float value) {
    (name.empty()
         ? EXPECT_CALL(*mock_, RenderFloat(IsEmpty(),
                                           NanSensitiveFloatEq(value)))
         : EXPECT_CALL(*mock_, RenderFloat(StrEq(name.ToString()),
                                           NanSensitiveFloatEq(value))))
        .WillOnce(Return(mock_))
        .RetiresOnSaturation();
    return this;
  }

  virtual ObjectWriter* RenderString(StringPiece name, StringPiece value) {
    (name.empty()
         ? EXPECT_CALL(*mock_, RenderString(IsEmpty(),
               TypedEq<StringPiece>(value.ToString())))
         : EXPECT_CALL(*mock_, RenderString(StrEq(name.ToString()),
               TypedEq<StringPiece>(value.ToString()))))
        .WillOnce(Return(mock_))
        .RetiresOnSaturation();
    return this;
  }
  virtual ObjectWriter* RenderBytes(StringPiece name, StringPiece value) {
    (name.empty()
         ? EXPECT_CALL(*mock_, RenderBytes(IsEmpty(), TypedEq<StringPiece>(
                                                          value.ToString())))
         : EXPECT_CALL(*mock_,
                       RenderBytes(StrEq(name.ToString()),
                                   TypedEq<StringPiece>(value.ToString()))))
        .WillOnce(Return(mock_))
        .RetiresOnSaturation();
    return this;
  }

  virtual ObjectWriter* RenderNull(StringPiece name) {
    (name.empty() ? EXPECT_CALL(*mock_, RenderNull(IsEmpty()))
                  : EXPECT_CALL(*mock_, RenderNull(StrEq(name.ToString())))
                        .WillOnce(Return(mock_))
                        .RetiresOnSaturation());
    return this;
  }

 private:
  MockObjectWriter* mock_;

  GOOGLE_DISALLOW_IMPLICIT_CONSTRUCTORS(ExpectingObjectWriter);
};

}  // namespace converter
}  // namespace util
}  // namespace protobuf

}  // namespace google
#endif  // GOOGLE_PROTOBUF_UTIL_CONVERTER_EXPECTING_OBJECTWRITER_H__