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// Compare two DataViews byte-by-byte.
function compareDataViews(actual, expected) {
assert_true(actual instanceof DataView, 'actual is DataView');
assert_true(expected instanceof DataView, 'expected is DataView');
assert_equals(actual.byteLength, expected.byteLength, 'lengths equal');
for (let i = 0; i < expected.byteLength; ++i) {
assert_equals(
actual.getUint8(i), expected.getUint8(i), `Mismatch at byte ${i}.`);
}
}
// Returns a Promise that resolves once |device| receives an input report.
function oninputreport(device) {
assert_true(device instanceof HIDDevice);
return new Promise(resolve => {
device.oninputreport = resolve;
});
}