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diff --git a/externals/breakpad/src/common/string_conversion_unittest.cc b/externals/breakpad/src/common/string_conversion_unittest.cc
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+++ b/externals/breakpad/src/common/string_conversion_unittest.cc
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+// Copyright 2019 Google LLC
+//
+// 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 LLC 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.
+
+// string_conversion_unittest.cc: Unit tests for google_breakpad::UTF* helpers.
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>  // Must come first
+#endif
+
+#include <string>
+#include <vector>
+
+#include "breakpad_googletest_includes.h"
+#include "common/string_conversion.h"
+
+using google_breakpad::UTF8ToUTF16;
+using google_breakpad::UTF8ToUTF16Char;
+using google_breakpad::UTF16ToUTF8;
+using std::vector;
+
+TEST(StringConversionTest, UTF8ToUTF16) {
+  const char in[] = "aßc";
+  vector<uint16_t> out;
+  vector<uint16_t> exp{'a', 0xdf, 'c', 0};
+  UTF8ToUTF16(in, &out);
+  EXPECT_EQ(4u, out.size());
+  EXPECT_EQ(exp, out);
+}
+
+TEST(StringConversionTest, UTF8ToUTF16Char) {
+  const char in[] = "a";
+  uint16_t out[3] = {0xff, 0xff, 0xff};
+  EXPECT_EQ(1, UTF8ToUTF16Char(in, 1, out));
+  EXPECT_EQ('a', out[0]);
+  EXPECT_EQ(0, out[1]);
+  EXPECT_EQ(0xff, out[2]);
+}
+
+TEST(StringConversionTest, UTF16ToUTF8) {
+  vector<uint16_t> in{'a', 0xdf, 'c', 0};
+  EXPECT_EQ("aßc", UTF16ToUTF8(in, false));
+}