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function stashPutUrl(token) {
return `/preload/resources/stash-put.py?key=${token}`;
}
function encodedStashPutUrl(token) {
return encodeURIComponent(stashPutUrl(token));
}
async function hasArrivedAtServer(token) {
const res = await fetch(`/preload/resources/stash-take.py?key=${token}`);
assert_true(res.status === 200 || res.status === 404,
'status must be either 200 or 404');
return res.status === 200;
}
function verifyPreloadAndRTSupport()
{
var link = window.document.createElement("link");
assert_true(link.relList && link.relList.supports("preload"), "Preload not supported");
assert_true(!!window.PerformanceResourceTiming, "ResourceTiming not supported");
}
function getAbsoluteURL(url)
{
return new URL(url, location.href).href;
}
function verifyNumberOfResourceTimingEntries(url, number)
{
assert_equals(numberOfResourceTimingEntries(url), number, url);
}
function numberOfResourceTimingEntries(url)
{
return performance.getEntriesByName(getAbsoluteURL(url)).length;
}
// Verifies that the resource is loaded, but not downloaded from network
// more than once. This can be used to verify that a preloaded resource is
// not downloaded again when used.
function verifyLoadedAndNoDoubleDownload(url) {
var entries = performance.getEntriesByName(getAbsoluteURL(url));
// UA may create separate RT entries for preload and normal load,
// so we just check (entries.length > 0).
assert_greater_than(entries.length, 0, url + ' should be loaded');
var numDownloads = 0;
entries.forEach(entry => {
// transferSize is zero if the resource is loaded from cache.
if (entry.transferSize > 0) {
numDownloads++;
}
});
// numDownloads can be zero if the resource was already cached before running
// the test (for example, when the test is running repeatedly without
// clearing cache between runs).
assert_less_than_equal(
numDownloads, 1,
url + ' should be downloaded from network at most once');
}