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Test Info:

"use strict";
var gTestTab;
var gContentAPI;
add_task(setup_UITourTest);
add_UITour_task(async function () {
ok(
!gBrowser.selectedBrowser.isArticle,
"Should not be an article when we start"
);
ok(
document.getElementById("reader-mode-button").hidden,
"Button should be hidden."
);
await gContentAPI.forceShowReaderIcon();
await waitForConditionPromise(() => gBrowser.selectedBrowser.isArticle);
ok(gBrowser.selectedBrowser.isArticle, "Should suddenly be an article.");
ok(
!document.getElementById("reader-mode-button").hidden,
"Button should now be visible."
);
});