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diff --git a/externals/breakpad/src/common/safe_math_unittest.cc b/externals/breakpad/src/common/safe_math_unittest.cc
new file mode 100644
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+++ b/externals/breakpad/src/common/safe_math_unittest.cc
@@ -0,0 +1,76 @@
+// Copyright 2022 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.
+
+// safe_math_unittest.cc: Unit tests for SafeMath
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>  // Must come first
+#endif
+
+#include "safe_math.h"
+#include "breakpad_googletest_includes.h"
+
+namespace {
+
+using google_breakpad::AddIgnoringOverflow;
+using google_breakpad::AddWithOverflowCheck;
+
+TEST(SafeMath, AddOverflowWorksAsIntended) {
+  EXPECT_EQ(AddWithOverflowCheck<uint8_t>(0, 0),
+            std::make_pair<uint8_t>(0, false));
+  EXPECT_EQ(AddWithOverflowCheck<uint8_t>(0, 255),
+            std::make_pair<uint8_t>(255, false));
+  EXPECT_EQ(AddWithOverflowCheck<uint8_t>(1, 255),
+            std::make_pair<uint8_t>(0, true));
+
+  EXPECT_EQ(AddWithOverflowCheck<int8_t>(-128, 127),
+            std::make_pair<int8_t>(-1, false));
+  EXPECT_EQ(AddWithOverflowCheck<int8_t>(127, -128),
+            std::make_pair<int8_t>(-1, false));
+  EXPECT_EQ(AddWithOverflowCheck<int8_t>(1, -128),
+            std::make_pair<int8_t>(-127, false));
+  EXPECT_EQ(AddWithOverflowCheck<int8_t>(127, -1),
+            std::make_pair<int8_t>(126, false));
+
+  EXPECT_EQ(AddWithOverflowCheck<int8_t>(-128, -1),
+            std::make_pair<int8_t>(127, true));
+  EXPECT_EQ(AddWithOverflowCheck<int8_t>(-128, -128),
+            std::make_pair<int8_t>(0, true));
+  EXPECT_EQ(AddWithOverflowCheck<int8_t>(127, 1),
+            std::make_pair<int8_t>(-128, true));
+  EXPECT_EQ(AddWithOverflowCheck<int8_t>(127, 127),
+            std::make_pair<int8_t>(-2, true));
+}
+
+TEST(SafeMath, AddIgnoringOverflowWorksAsIntended) {
+  EXPECT_EQ(AddIgnoringOverflow<uint8_t>(0, 0), 0);
+  EXPECT_EQ(AddIgnoringOverflow<uint8_t>(0, 255), 255);
+  EXPECT_EQ(AddIgnoringOverflow<uint8_t>(1, 255), 0);
+}
+
+}  // namespace