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chromium/third_party/blink/web_tests/external/wpt/webaudio/the-audio-api/the-offlineaudiocontext-interface/current-time-block-size.html 

<!DOCTYPE html>
<title>Test currentTime at completion of OfflineAudioContext rendering</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
promise_test(function() {
  // sampleRate is a power of two so that time can be represented exactly
  // in double currentTime.
  var context = new OfflineAudioContext(1, 1, 65536);
  return context.startRendering().
    then(function(buffer) {
      assert_equals(buffer.length, 1, "buffer length");
      assert_equals(context.currentTime, 128 / context.sampleRate,
                    "currentTime at completion");
    });
});
</script>