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diff --git a/src/google/protobuf/stubs/strutil_unittest.cc b/src/google/protobuf/stubs/strutil_unittest.cc
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+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// 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.
+
+// Author: kenton@google.com (Kenton Varda)
+
+#include <google/protobuf/stubs/strutil.h>
+
+#include <google/protobuf/testing/googletest.h>
+#include <gtest/gtest.h>
+#include <locale.h>
+
+namespace google {
+namespace protobuf {
+namespace {
+
+// TODO(kenton):  Copy strutil tests from google3?
+
+TEST(StringUtilityTest, ImmuneToLocales) {
+  // Remember the old locale.
+  char* old_locale_cstr = setlocale(LC_NUMERIC, NULL);
+  ASSERT_TRUE(old_locale_cstr != NULL);
+  string old_locale = old_locale_cstr;
+
+  // Set the locale to "C".
+  ASSERT_TRUE(setlocale(LC_NUMERIC, "C") != NULL);
+
+  EXPECT_EQ(1.5, NoLocaleStrtod("1.5", NULL));
+  EXPECT_EQ("1.5", SimpleDtoa(1.5));
+  EXPECT_EQ("1.5", SimpleFtoa(1.5));
+
+  // Verify that the endptr is set correctly even if not all text was parsed.
+  const char* text = "1.5f";
+  char* endptr;
+  EXPECT_EQ(1.5, NoLocaleStrtod(text, &endptr));
+  EXPECT_EQ(3, endptr - text);
+
+  if (setlocale(LC_NUMERIC, "es_ES") == NULL &&
+      setlocale(LC_NUMERIC, "es_ES.utf8") == NULL) {
+    // Some systems may not have the desired locale available.
+    GOOGLE_LOG(WARNING)
+      << "Couldn't set locale to es_ES.  Skipping this test.";
+  } else {
+    EXPECT_EQ(1.5, NoLocaleStrtod("1.5", NULL));
+    EXPECT_EQ("1.5", SimpleDtoa(1.5));
+    EXPECT_EQ("1.5", SimpleFtoa(1.5));
+    EXPECT_EQ(1.5, NoLocaleStrtod(text, &endptr));
+    EXPECT_EQ(3, endptr - text);
+  }
+
+  // Return to original locale.
+  setlocale(LC_NUMERIC, old_locale.c_str());
+}
+
+}  // anonymous namespace
+}  // namespace protobuf
+}  // namespace google