mozilla-central/toolkit/components/thumbnails/test/browser_thumbnails_bg_no_duplicates.js (file symbol)

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/* Any copyright is dedicated to the Public Domain.
add_task(async function thumbnails_bg_no_duplicates() {
let url = "https://example.com/1";
ok(!thumbnailExists(url), "Thumbnail file should not already exist.");
let firstCapture = bgCapture(url, {
onDone: doneUrl => {
is(doneUrl, url, "called back with correct url");
ok(thumbnailExists(url), "Thumbnail file should now exist.");
removeThumbnail(url);
},
});
let secondCapture = bgCapture(url, {
onDone: doneUrl => {
is(doneUrl, url, "called back with correct url");
ok(!thumbnailExists(url), "Thumbnail file should still be deleted.");
},
});
await Promise.all([firstCapture, secondCapture]);
});