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diff --git a/src/google/protobuf/util/internal/snake2camel_objectwriter_test.cc b/src/google/protobuf/util/internal/snake2camel_objectwriter_test.cc
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@@ -0,0 +1,311 @@
+// 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/snake2camel_objectwriter.h>
+#include <google/protobuf/util/internal/expecting_objectwriter.h>
+#include <gtest/gtest.h>
+
+namespace google {
+namespace protobuf {
+namespace util {
+namespace converter {
+
+class Snake2CamelObjectWriterTest : public ::testing::Test {
+ protected:
+  Snake2CamelObjectWriterTest() : mock_(), expects_(&mock_), testing_(&mock_) {}
+  virtual ~Snake2CamelObjectWriterTest() {}
+
+  MockObjectWriter mock_;
+  ExpectingObjectWriter expects_;
+  Snake2CamelObjectWriter testing_;
+};
+
+TEST_F(Snake2CamelObjectWriterTest, Empty) {
+  // Set expectation
+  expects_.StartObject("")->EndObject();
+
+  // Actual testing
+  testing_.StartObject("")->EndObject();
+}
+
+TEST_F(Snake2CamelObjectWriterTest, UnderscoresOnly) {
+  // Set expectation
+  expects_.StartObject("")
+      ->RenderInt32("", 1)
+      ->RenderInt32("", 2)
+      ->RenderInt32("", 3)
+      ->RenderInt32("", 4)
+      ->RenderInt32("", 5)
+      ->EndObject();
+
+  // Actual testing
+  testing_.StartObject("")
+      ->RenderInt32("_", 1)
+      ->RenderInt32("__", 2)
+      ->RenderInt32("___", 3)
+      ->RenderInt32("____", 4)
+      ->RenderInt32("_____", 5)
+      ->EndObject();
+}
+
+TEST_F(Snake2CamelObjectWriterTest, LowercaseOnly) {
+  // Set expectation
+  expects_.StartObject("")
+      ->RenderString("key", "value")
+      ->RenderString("abracadabra", "magic")
+      ->EndObject();
+
+  // Actual testing
+  testing_.StartObject("")
+      ->RenderString("key", "value")
+      ->RenderString("abracadabra", "magic")
+      ->EndObject();
+}
+
+TEST_F(Snake2CamelObjectWriterTest, UppercaseOnly) {
+  // Set expectation
+  expects_.StartObject("")
+      ->RenderString("key", "VALUE")
+      ->RenderString("abracadabra", "MAGIC")
+      ->EndObject();
+
+  // Actual testing
+  testing_.StartObject("")
+      ->RenderString("KEY", "VALUE")
+      ->RenderString("ABRACADABRA", "MAGIC")
+      ->EndObject();
+}
+
+TEST_F(Snake2CamelObjectWriterTest, CamelCase) {
+  // Set expectation
+  expects_.StartObject("")
+      ->RenderString("camelCase", "camelCase")
+      ->RenderString("theQuickBrownFoxJumpsOverTheLazyDog",
+                     "theQuickBrownFoxJumpsOverTheLazyDog")
+      ->EndObject();
+
+  // Actual testing
+  testing_.StartObject("")
+      ->RenderString("camelCase", "camelCase")
+      ->RenderString("theQuickBrownFoxJumpsOverTheLazyDog",
+                     "theQuickBrownFoxJumpsOverTheLazyDog")
+      ->EndObject();
+}
+
+TEST_F(Snake2CamelObjectWriterTest, FirstCapCamelCase) {
+  // Sets expectation
+  expects_.StartObject("camel")
+      ->RenderString("camelCase", "CamelCase")
+      ->RenderString("theQuickBrownFoxJumpsOverTheLazyDog",
+                     "TheQuickBrownFoxJumpsOverTheLazyDog")
+      ->EndObject();
+
+  // Actual testing
+  testing_.StartObject("Camel")
+      ->RenderString("CamelCase", "CamelCase")
+      ->RenderString("TheQuickBrownFoxJumpsOverTheLazyDog",
+                     "TheQuickBrownFoxJumpsOverTheLazyDog")
+      ->EndObject();
+}
+
+TEST_F(Snake2CamelObjectWriterTest, LastCapCamelCase) {
+  // Sets expectation
+  expects_.StartObject("lastCapCamelCasE")->EndObject();
+
+  // Actual testing
+  testing_.StartObject("lastCapCamelCasE")->EndObject();
+}
+
+TEST_F(Snake2CamelObjectWriterTest, MixedCapCamelCase) {
+  // Sets expectation
+  expects_.StartObject("googleIsTheBest")
+      ->RenderFloat("iLoveGOOGLE", 1.61803f)
+      ->RenderFloat("goGoogleGO", 2.71828f)
+      ->RenderFloat("gBikeISCool", 3.14159f)
+      ->EndObject();
+
+  // Actual testing
+  testing_.StartObject("GOOGLEIsTheBest")
+      ->RenderFloat("ILoveGOOGLE", 1.61803f)
+      ->RenderFloat("GOGoogleGO", 2.71828f)
+      ->RenderFloat("GBikeISCool", 3.14159f)
+      ->EndObject();
+}
+
+TEST_F(Snake2CamelObjectWriterTest, MixedCase) {
+  // Sets expectation
+  expects_.StartObject("snakeCaseCamelCase")
+      ->RenderBool("camelCaseSnakeCase", false)
+      ->RenderBool("mixedCamelAndUnderScores", false)
+      ->RenderBool("goGOOGLEGo", true)
+      ->EndObject();
+
+  // Actual testing
+  testing_.StartObject("snake_case_camelCase")
+      ->RenderBool("camelCase_snake_case", false)
+      ->RenderBool("MixedCamel_And_UnderScores", false)
+      ->RenderBool("Go_GOOGLEGo", true)
+      ->EndObject();
+}
+
+TEST_F(Snake2CamelObjectWriterTest, SnakeCase) {
+  // Sets expectation
+  expects_.StartObject("")
+      ->RenderString("snakeCase", "snake_case")
+      ->RenderString("theQuickBrownFoxJumpsOverTheLazyDog",
+                     "the_quick_brown_fox_jumps_over_the_lazy_dog")
+      ->EndObject();
+
+  // Actual testing
+  testing_.StartObject("")
+      ->RenderString("snake_case", "snake_case")
+      ->RenderString("the_quick_brown_fox_jumps_over_the_lazy_dog",
+                     "the_quick_brown_fox_jumps_over_the_lazy_dog")
+      ->EndObject();
+}
+
+TEST_F(Snake2CamelObjectWriterTest, FirstCapSnakeCase) {
+  // Sets expectation
+  expects_.StartObject("firstCapSnakeCase")
+      ->RenderBool("helloWorld", true)
+      ->EndObject();
+
+  // Actual testing
+  testing_.StartObject("First_Cap_Snake_Case")
+      ->RenderBool("Hello_World", true)
+      ->EndObject();
+}
+
+TEST_F(Snake2CamelObjectWriterTest, AllCapSnakeCase) {
+  // Sets expectation
+  expects_.StartObject("allCAPSNAKECASE")
+      ->RenderDouble("nyseGOOGL", 600.0L)
+      ->RenderDouble("aBCDE", 1.0L)
+      ->RenderDouble("klMNOP", 2.0L)
+      ->RenderDouble("abcIJKPQRXYZ", 3.0L)
+      ->EndObject();
+
+  // Actual testing
+  testing_.StartObject("ALL_CAP_SNAKE_CASE")
+      ->RenderDouble("NYSE_GOOGL", 600.0L)
+      ->RenderDouble("A_B_C_D_E", 1.0L)
+      ->RenderDouble("KL_MN_OP", 2.0L)
+      ->RenderDouble("ABC_IJK_PQR_XYZ", 3.0L)
+      ->EndObject();
+}
+
+TEST_F(Snake2CamelObjectWriterTest, RepeatedUnderScoreSnakeCase) {
+  // Sets expectation
+  expects_.StartObject("")
+      ->RenderInt32("doubleUnderscoreSnakeCase", 2)
+      ->RenderInt32("tripleUnderscoreFirstCap", 3)
+      ->RenderInt32("quadrupleUNDERSCOREALLCAP", 4)
+      ->EndObject();
+
+  // Actual testing
+  testing_.StartObject("")
+      ->RenderInt32("double__underscore__snake__case", 2)
+      ->RenderInt32("Triple___Underscore___First___Cap", 3)
+      ->RenderInt32("QUADRUPLE____UNDERSCORE____ALL____CAP", 4)
+      ->EndObject();
+}
+
+TEST_F(Snake2CamelObjectWriterTest, LeadingUnderscoreSnakeCase) {
+  // Sets expectation
+  expects_.StartObject("leadingUnderscoreSnakeCase")
+      ->RenderUint32("leadingDoubleUnderscore", 2)
+      ->RenderUint32("leadingTripleUnderscoreFirstCap", 3)
+      ->RenderUint32("leadingQUADRUPLEUNDERSCOREALLCAP", 4)
+      ->EndObject();
+
+  // Actual testing
+  testing_.StartObject("_leading_underscore_snake_case")
+      ->RenderUint32("__leading_double_underscore", 2)
+      ->RenderUint32("___Leading_Triple_Underscore_First_Cap", 3)
+      ->RenderUint32("____LEADING_QUADRUPLE_UNDERSCORE_ALL_CAP", 4)
+      ->EndObject();
+}
+
+TEST_F(Snake2CamelObjectWriterTest, TrailingUnderscoreSnakeCase) {
+  // Sets expectation
+  expects_.StartObject("trailingUnderscoreSnakeCase")
+      ->RenderInt64("trailingDoubleUnderscore", 2L)
+      ->RenderInt64("trailingTripleUnderscoreFirstCap", 3L)
+      ->RenderInt64("trailingQUADRUPLEUNDERSCOREALLCAP", 4L)
+      ->EndObject();
+
+  // Actual testing
+  testing_.StartObject("trailing_underscore_snake_case")
+      ->RenderInt64("trailing_double_underscore__", 2L)
+      ->RenderInt64("Trailing_Triple_Underscore_First_Cap___", 3L)
+      ->RenderInt64("TRAILING_QUADRUPLE_UNDERSCORE_ALL_CAP____", 4L)
+      ->EndObject();
+}
+
+TEST_F(Snake2CamelObjectWriterTest, EnclosingUnderscoreSnakeCase) {
+  // Sets expectation
+  expects_.StartObject("enclosingUnderscoreSnakeCase")
+      ->RenderUint64("enclosingDoubleUnderscore", 2L)
+      ->RenderUint64("enclosingTripleUnderscoreFirstCap", 3L)
+      ->RenderUint64("enclosingQUADRUPLEUNDERSCOREALLCAP", 4L)
+      ->EndObject();
+
+  // Actual testing
+  testing_.StartObject("_enclosing_underscore_snake_case_")
+      ->RenderUint64("__enclosing_double_underscore__", 2L)
+      ->RenderUint64("___Enclosing_Triple_Underscore_First_Cap___", 3L)
+      ->RenderUint64("____ENCLOSING_QUADRUPLE_UNDERSCORE_ALL_CAP____", 4L)
+      ->EndObject();
+}
+
+TEST_F(Snake2CamelObjectWriterTest, DisableCaseNormalizationOnlyDisablesFirst) {
+  // Sets expectation
+  expects_.StartObject("")
+      ->RenderString("snakeCase", "snake_case")
+      ->RenderString(
+            "the_quick_brown_fox_jumps_over_the_lazy_dog",  // case retained
+            "the_quick_brown_fox_jumps_over_the_lazy_dog")
+      ->RenderBool("theSlowFox", true)  // disable case not in effect
+      ->EndObject();
+
+  // Actual testing
+  testing_.StartObject("")
+      ->RenderString("snake_case", "snake_case")
+      ->DisableCaseNormalizationForNextKey()
+      ->RenderString("the_quick_brown_fox_jumps_over_the_lazy_dog",
+                     "the_quick_brown_fox_jumps_over_the_lazy_dog")
+      ->RenderBool("the_slow_fox", true)
+      ->EndObject();
+}
+
+}  // namespace converter
+}  // namespace util
+}  // namespace protobuf
+}  // namespace google