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// META: script=/resources/test-only-api.js
// META: script=/serial/resources/common.js
// META: script=resources/automation.js
serial_test(async (t, fake) => {
const {port, fakePort} = await getFakeSerialPort(fake);
await port.open({baudRate: 9600, bufferSize: 64});
const reader = port.readable.getReader();
const readPromise = reader.read();
await reader.cancel();
const {value, done} = await readPromise;
assert_true(done);
assert_equals(undefined, value);
await port.close();
}, 'Can cancel while reading');
serial_test(async (t, fake) => {
const {port, fakePort} = await getFakeSerialPort(fake);
await port.open({baudRate: 9600, bufferSize: 64});
const reader = port.readable.getReader();
const closed = (async () => {
const {value, done} = await reader.read();
assert_true(done);
assert_equals(undefined, value);
reader.releaseLock();
await port.close();
assert_equals(port.readable, null);
})();
await reader.cancel();
await closed;
}, 'Can close while canceling');
serial_test(async (t, fake) => {
const {port, fakePort} = await getFakeSerialPort(fake);
await port.open({baudRate: 9600, bufferSize: 64});
const reader = port.readable.getReader();
await fakePort.writable();
const data = new Uint8Array([1, 2, 3, 4, 5, 6, 7, 8]);
await fakePort.write(data);
await reader.cancel();
await port.close();
}, 'Cancel discards a small amount of data waiting to be read');
serial_test(async (t, fake) => {
const {port, fakePort} = await getFakeSerialPort(fake);
// Select a buffer size smaller than the amount of data transferred.
await port.open({baudRate: 9600, bufferSize: 64});
const reader = port.readable.getReader();
await fakePort.writable();
const data = new Uint8Array(1024);
// Writing will fail because there was more data to send than could fit in the
// buffer and none of it was read.
const writePromise =
promise_rejects_dom(t, 'InvalidStateError', fakePort.write(data));
await reader.cancel();
await writePromise;
await port.close();
}, 'Cancel discards a large amount of data waiting to be read');
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