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add_task(async function () {
// We don't want the number of total viewers to be calculated by the available size
// for this test case. Instead, fix the number of viewers.
await SpecialPowers.pushPrefEnv({
set: [
["browser.sessionhistory.max_total_viewers", 3],
["docshell.shistory.testing.bfevict", true],
// If Fission is disabled, the pref is no-op.
["fission.bfcacheInParent", true],
],
});
// 1. Open a tab
var testPage =
"data:text/html,<html id='html1'><body id='body1'>First tab ever opened</body></html>";
await BrowserTestUtils.withNewTab(
{ gBrowser, url: testPage },
async function (browser) {
let testDone = {};
if (!SpecialPowers.Services.appinfo.sessionHistoryInParent) {
// 2. Add a promise that will be resolved when the 'content viewer evicted' event goes off
testDone.promise = SpecialPowers.spawn(browser, [], async function () {
return new Promise(resolve => {
let webNavigation = content.docShell.QueryInterface(
Ci.nsIWebNavigation
);
let { legacySHistory } = webNavigation.sessionHistory;
// 3. Register a session history listener to listen for a 'content viewer evicted' event.
let historyListener = {
OnDocumentViewerEvicted() {
ok(
true,
"History listener got called after a content viewer was evicted"
);
legacySHistory.removeSHistoryListener(historyListener);
// 6. Resolve the promise when we got our 'content viewer evicted' event
resolve();
},
QueryInterface: ChromeUtils.generateQI([
"nsISHistoryListener",
"nsISupportsWeakReference",
]),
};
legacySHistory.addSHistoryListener(historyListener);
// Keep the weak shistory listener alive
content._testListener = historyListener;
});
});
} else {
// 2. Add a promise that will be resolved when the 'content viewer evicted' event goes off
testDone.promise = new Promise(resolve => {
testDone.resolve = resolve;
});
let shistory = browser.browsingContext.sessionHistory;
// 3. Register a session history listener to listen for a 'content viewer evicted' event.
let historyListener = {
OnDocumentViewerEvicted() {
ok(
true,
"History listener got called after a content viewer was evicted"
);
shistory.removeSHistoryListener(historyListener);
delete window._testListener;
// 6. Resolve the promise when we got our 'content viewer evicted' event
testDone.resolve();
},
QueryInterface: ChromeUtils.generateQI([
"nsISHistoryListener",
"nsISupportsWeakReference",
]),
};
shistory.addSHistoryListener(historyListener);
// Keep the weak shistory listener alive
window._testListener = historyListener;
}
// 4. Open a second tab
testPage = `data:text/html,<html id='html1'><body id='body1'>I am a second tab!</body></html>`;
let tab2 = await BrowserTestUtils.openNewForegroundTab(
gBrowser,
testPage
);
// 5. Navigate the first tab to 4 different pages.
// We should get 1 content viewer evicted because it will be outside of the range.
// If we have the following pages in our session history: P1 P2 P3 P4 P5
// and we are currently at P5, then P1 is outside of the range
// (it is more than 3 entries away from current entry) and thus will be evicted.
for (var i = 0; i < 4; i++) {
testPage = `data:text/html,<html id='html1'><body id='body1'>${i}</body></html>`;
let pagePromise = BrowserTestUtils.browserLoaded(browser);
BrowserTestUtils.startLoadingURIString(browser, testPage);
await pagePromise;
}
// 7. Wait for 'content viewer evicted' event to go off
await testDone.promise;
// 8. Close the second tab
BrowserTestUtils.removeTab(tab2);
}
);
});
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