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diff --git a/externals/breakpad/src/common/linux/scoped_pipe_unittest.cc b/externals/breakpad/src/common/linux/scoped_pipe_unittest.cc
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+++ b/externals/breakpad/src/common/linux/scoped_pipe_unittest.cc
@@ -0,0 +1,75 @@
+// 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.
+
+// scoped_pipe_unittest.cc: Unit tests for google_breakpad::ScopedPipe.
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>  // Must come first
+#endif
+
+#include "common/linux/scoped_pipe.h"
+
+#include "breakpad_googletest_includes.h"
+
+namespace google_breakpad {
+
+TEST(ScopedPipeTest, WriteAndClose) {
+  const char kTestData[] = "One\nTwo\nThree";
+  ScopedPipe pipe;
+  std::string line;
+
+  ASSERT_TRUE(pipe.Init());
+  ASSERT_TRUE(pipe.WriteForTesting(kTestData, strlen(kTestData)));
+  pipe.CloseWriteFd();
+
+  ASSERT_TRUE(pipe.ReadLine(line));
+  ASSERT_EQ(line, "One");
+  ASSERT_TRUE(pipe.ReadLine(line));
+  ASSERT_EQ(line, "Two");
+  ASSERT_TRUE(pipe.ReadLine(line));
+  ASSERT_EQ(line, "Three");
+  ASSERT_FALSE(pipe.ReadLine(line));
+}
+
+TEST(ScopedPipeTest, MultipleWrites) {
+  const char kTestDataOne[] = "One\n";
+  const char kTestDataTwo[] = "Two\n";
+  ScopedPipe pipe;
+  std::string line;
+
+  ASSERT_TRUE(pipe.Init());
+  ASSERT_TRUE(pipe.WriteForTesting(kTestDataOne, strlen(kTestDataOne)));
+  ASSERT_TRUE(pipe.ReadLine(line));
+  ASSERT_EQ(line, "One");
+
+  ASSERT_TRUE(pipe.WriteForTesting(kTestDataTwo, strlen(kTestDataTwo)));
+  ASSERT_TRUE(pipe.ReadLine(line));
+  ASSERT_EQ(line, "Two");
+}
+
+}  // namespace google_breakpad