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<!DOCTYPE html>
<meta charset="utf-8">
<title>Getting the presentation displays availability information.</title>
<link rel="author" title="Marius Wessel" href="http://www.fokus.fraunhofer.de">
<link rel="author" title="Tomoyuki Shimizu" href="https://github.com/tomoyukilabs">
<link rel="help" href="http://w3c.github.io/presentation-api/#dfn-presentation-display-availability">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="common.js"></script>
<p>The test passes if a "PASS" result appears.</p>
<script>
// ---------------------------------------
// Presentation Availability Tests - begin
// ---------------------------------------
promise_test(t => {
let availability;
const request = new PresentationRequest(presentationUrls);
assert_true(request instanceof PresentationRequest, 'The request is an instance of PresentationRequest.');
const promise = request.getAvailability();
assert_equals(promise, request.getAvailability(), 'If the PresentationRequest object has an unsettled Promise, getAvailability returns that Promise.');
function catchNotSupported(err) {
assert_equals(err.name, 'NotSupportedError', 'getAvailability() rejects a Promise with a NotSupportedError exception, if the browser can find presentation displays only when starting a connection.')
}
return promise.then(a => {
availability = a;
assert_true(availability instanceof PresentationAvailability, 'The promise is resolved with an instance of PresentationAvailability.');
assert_equals(typeof availability.value, 'boolean', 'The availability has an boolean value.');
// The value of the presentation availability object is set to false, when the object is newly created.
const waitForChange = () => {
const eventWatcher = new EventWatcher(t, availability, 'change');
return eventWatcher.wait_for('change');
};
return (availability.value ? Promise.resolve() : waitForChange()).then(() => {
assert_true(availability.value, 'The availability value is true when any presentation display is available.');
const request2 = new PresentationRequest('https://example.com');
return request2.getAvailability();
}).then(a => {
assert_not_equals(availability, a, 'A presentation availability object is newly created if the presentation request has a newly added presentation URLs.');
const newPromise = request.getAvailability();
assert_not_equals(promise, newPromise, 'If the Promise from a previous call to getAvailability has already been settled, getAvailability returns a new Promise.');
return newPromise.then(newAvailability => {
assert_equals(availability, newAvailability, 'Promises from a PresentationRequest\'s getAvailability are resolved with the same PresentationAvailability object.');
}, catchNotSupported);
}, catchNotSupported);
}, catchNotSupported);
});
</script>
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