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diff --git a/src/google/protobuf/util/internal/default_value_objectwriter_test.cc b/src/google/protobuf/util/internal/default_value_objectwriter_test.cc
new file mode 100644
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--- /dev/null
+++ b/src/google/protobuf/util/internal/default_value_objectwriter_test.cc
@@ -0,0 +1,139 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// 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 <google/protobuf/util/internal/default_value_objectwriter.h>
+#include <google/protobuf/util/internal/expecting_objectwriter.h>
+#include <google/protobuf/util/internal/testdata/default_value_test.pb.h>
+#include <google/protobuf/util/internal/type_info_test_helper.h>
+#include <google/protobuf/util/internal/constants.h>
+#include <gtest/gtest.h>
+
+namespace google {
+namespace protobuf {
+namespace util {
+namespace converter {
+namespace testing {
+
+using google::protobuf::testing::DefaultValueTest;
+
+// Tests to cover some basic DefaultValueObjectWriter use cases. More tests are
+// in the marshalling_test.cc and translator_integration_test.cc.
+class DefaultValueObjectWriterTest
+    : public ::testing::TestWithParam<testing::TypeInfoSource> {
+ protected:
+  DefaultValueObjectWriterTest()
+      : helper_(GetParam()), mock_(), expects_(&mock_) {
+    helper_.ResetTypeInfo(DefaultValueTest::descriptor());
+    testing_.reset(helper_.NewDefaultValueWriter(
+        string(kTypeServiceBaseUrl) + "/" +
+            DefaultValueTest::descriptor()->full_name(),
+        &mock_));
+  }
+
+  virtual ~DefaultValueObjectWriterTest() {}
+
+  TypeInfoTestHelper helper_;
+  MockObjectWriter mock_;
+  ExpectingObjectWriter expects_;
+  google::protobuf::scoped_ptr<DefaultValueObjectWriter> testing_;
+};
+
+INSTANTIATE_TEST_CASE_P(DifferentTypeInfoSourceTest,
+                        DefaultValueObjectWriterTest,
+                        ::testing::Values(
+                            testing::USE_TYPE_RESOLVER));
+
+TEST_P(DefaultValueObjectWriterTest, Empty) {
+  // Set expectation
+  expects_.StartObject("")
+      ->RenderDouble("double_value", 0.0)
+      ->RenderFloat("float_value", 0.0)
+      ->RenderInt64("int64_value", 0)
+      ->RenderUint64("uint64_value", 0)
+      ->RenderInt32("int32_value", 0)
+      ->RenderUint32("uint32_value", 0)
+      ->RenderBool("bool_value", false)
+      ->RenderString("string_value", "")
+      ->RenderBytes("bytes_value", "")
+      ->EndObject();
+
+  // Actual testing
+  testing_->StartObject("")->EndObject();
+}
+
+TEST_P(DefaultValueObjectWriterTest, NonDefaultDouble) {
+  // Set expectation
+  expects_.StartObject("")
+      ->RenderDouble("double_value", 1.0)
+      ->RenderFloat("float_value", 0.0)
+      ->RenderInt64("int64_value", 0)
+      ->RenderUint64("uint64_value", 0)
+      ->RenderInt32("int32_value", 0)
+      ->RenderUint32("uint32_value", 0)
+      ->RenderBool("bool_value", false)
+      ->RenderString("string_value", "")
+      ->EndObject();
+
+  // Actual testing
+  testing_->StartObject("")->RenderDouble("double_value", 1.0)->EndObject();
+}
+
+TEST_P(DefaultValueObjectWriterTest, ShouldRetainUnknownField) {
+  // Set expectation
+  expects_.StartObject("")
+      ->RenderDouble("double_value", 1.0)
+      ->RenderFloat("float_value", 0.0)
+      ->RenderInt64("int64_value", 0)
+      ->RenderUint64("uint64_value", 0)
+      ->RenderInt32("int32_value", 0)
+      ->RenderUint32("uint32_value", 0)
+      ->RenderBool("bool_value", false)
+      ->RenderString("string_value", "")
+      ->RenderString("unknown", "abc")
+      ->StartObject("unknown_object")
+      ->RenderString("unknown", "def")
+      ->EndObject()
+      ->EndObject();
+
+  // Actual testing
+  testing_->StartObject("")
+      ->RenderDouble("double_value", 1.0)
+      ->RenderString("unknown", "abc")
+      ->StartObject("unknown_object")
+      ->RenderString("unknown", "def")
+      ->EndObject()
+      ->EndObject();
+}
+
+}  // namespace testing
+}  // namespace converter
+}  // namespace util
+}  // namespace protobuf
+}  // namespace google