<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/common.js"></script>
<script src="resources/manual.js"></script>
</head>
<body>
<p>
These tests require a connected serial device configured to act as a
"loopback" device, with the transmit and receive pins wired together.
</p>
<script>
manual_serial_test(async (t, port) => {
await port.open({baudRate: 115200, bufferSize: 1024});
// Create something much larger than bufferSize above.
const data = new Uint8Array(16 * 1024);
for (let i = 0; i < data.byteLength; ++i)
data[i] = (i / 1024) & 0xff;
// Completely write |data| to the port without waiting for it to be
// received.
const writer = port.writable.getWriter();
writer.write(data);
await writer.close();
const reader = port.readable.getReader();
const chunks = [];
let actualLength = 0;
while (true) {
try {
const {value, done} = await reader.read();
if (value) {
actualLength += value.byteLength;
chunks.push(value);
}
if (done) {
assert_unreached("Unexpected end of stream.");
break;
}
} catch (e) {
assert_equals(e.name, 'BufferOverrunError');
break;
}
}
reader.releaseLock();
const buffer = new Uint8Array(actualLength);
chunks.reduce((offset, chunk) => {
buffer.set(chunk, offset);
return offset + chunk.byteLength;
}, 0);
assert_greater_than(actualLength, 0);
compareArrays(buffer, data.slice(0, actualLength));
await port.close();
}, 'Overflowing the receive buffer triggers an error.');
</script>
</body>
</html>
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