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chromium/third_party/blink/web_tests/http/tests/mojo/shared-buffer-crash.html 

<!DOCTYPE html>
<title>Mojo shared buffer tests</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>

let kBufferSize = 32;

test(() => {
  let {handle} = Mojo.createSharedBuffer(kBufferSize);
  let {result, buffer} = handle.mapBuffer(kBufferSize, kBufferSize);
  assert_equals(result, Mojo.RESULT_INVALID_ARGUMENT);
  assert_equals(buffer, undefined);
}, "Attempt to map beyond buffer size does not crash");
</script>