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Test Info:

"use strict";
const GUIDS = [
PlacesUtils.bookmarks.rootGuid,
...PlacesUtils.bookmarks.userContentRoots,
PlacesUtils.bookmarks.tagsGuid,
];
add_task(async function test_isRootItem() {
for (let guid of GUIDS) {
Assert.ok(
PlacesUtils.isRootItem(guid),
`Should correctly identify root item ${guid}`
);
}
Assert.ok(
!PlacesUtils.isRootItem("fakeguid1234"),
"Should not identify other items as root."
);
});