reader-closedPromise-handled.js

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// |jit-test| skip-if: !this.hasOwnProperty("ReadableStream")

// Creating a reader from an errored stream should not result in a promise

// being tracked as unhandled.

// Create an errored stream.

let stream = new ReadableStream({

  start(controller) {

    controller.error(new Error("splines insufficiently reticulated"));

});

drainJobQueue();

// Track promises.

let status = new Map;

setPromiseRejectionTrackerCallback((p, x) => { status.set(p, x); });

// Per Streams spec 3.7.4 step 5.c, this creates a rejected promise

// (reader.closed) but marks it as handled.

let reader = stream.getReader();

// Check that the promise's status is not 0 (unhandled);

// it may be either 1 (handled) or undefined (never tracked).

let result = status.get(reader.closed);

assertEq(result === 1 || result === undefined, true);