
PASS If request.[[state]] is "created", then return a promise that resolves to true for known method. 
PASS If request.[[state]] is "interactive", then return a promise rejected with an "InvalidStateError" DOMException. 
PASS If request.[[state]] is "closed", then return a promise rejected with an "InvalidStateError" DOMException. 
PASS If payment method identifier and serialized parts are supported, resolve promise with true. 
PASS If a payment method identifier is supported but its serialized parts are not, resolve promise with false. 
PASS If payment method identifier is unknown, resolve promise with false. 
PASS Optionally, at the user agent's discretion, return a promise rejected with a "NotAllowedError" DOMException.