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diff --git a/browser/components/sessionstore/test/browser_491168.js b/browser/components/sessionstore/test/browser_491168.js
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+"use strict";
+
+const REFERRER1 = "http://example.org/?" + Date.now();
+const REFERRER2 = "http://example.org/?" + Math.random();
+const REFERRER3 = "http://example.org/?" + Math.random();
+
+add_task(async function () {
+ function getExpectedReferrer(referrer) {
+ let defaultPolicy = Services.prefs.getIntPref(
+ "network.http.referer.defaultPolicy"
+ );
+ ok(
+ [2, 3].indexOf(defaultPolicy) > -1,
+ "default referrer policy should be either strict-origin-when-cross-origin(2) or no-referrer-when-downgrade(3)"
+ );
+ if (defaultPolicy == 2) {
+ return referrer.match(/https?:\/\/[^\/]+\/?/i)[0];
+ }
+ return referrer;
+ }
+
+ async function checkDocumentReferrer(referrer, msg) {
+ await SpecialPowers.spawn(
+ gBrowser.selectedBrowser,
+ [{ referrer, msg }],
+ async function (args) {
+ Assert.equal(content.document.referrer, args.referrer, args.msg);
+ }
+ );
+ }
+
+ let ReferrerInfo = Components.Constructor(
+ "@mozilla.org/referrer-info;1",
+ "nsIReferrerInfo",
+ "init"
+ );
+ // Add a new tab.
+ let tab = (gBrowser.selectedTab = BrowserTestUtils.addTab(
+ gBrowser,
+ "about:blank"
+ ));
+ let browser = tab.linkedBrowser;
+ await promiseBrowserLoaded(browser);
+
+ // Load a new URI with a specific referrer.
+ let referrerInfo1 = new ReferrerInfo(
+ Ci.nsIReferrerInfo.EMPTY,
+ true,
+ Services.io.newURI(REFERRER1)
+ );
+ browser.loadURI(Services.io.newURI("http://example.org"), {
+ referrerInfo: referrerInfo1,
+ triggeringPrincipal: Services.scriptSecurityManager.createNullPrincipal({}),
+ });
+ await promiseBrowserLoaded(browser);
+
+ await TabStateFlusher.flush(browser);
+ let tabState = JSON.parse(ss.getTabState(tab));
+ let actualReferrerInfo = E10SUtils.deserializeReferrerInfo(
+ tabState.entries[0].referrerInfo
+ );
+ is(
+ actualReferrerInfo.originalReferrer.spec,
+ REFERRER1,
+ "Referrer retrieved via getTabState matches referrer set via loadURI."
+ );
+
+ let referrerInfo2 = new ReferrerInfo(
+ Ci.nsIReferrerInfo.EMPTY,
+ true,
+ Services.io.newURI(REFERRER2)
+ );
+
+ tabState.entries[0].referrerInfo =
+ E10SUtils.serializeReferrerInfo(referrerInfo2);
+ await promiseTabState(tab, tabState);
+
+ await checkDocumentReferrer(
+ getExpectedReferrer(REFERRER2),
+ "document.referrer matches referrer set via setTabState using referrerInfo."
+ );
+ gBrowser.removeCurrentTab();
+
+ // Restore the closed tab.
+ tab = ss.undoCloseTab(window, 0);
+ await promiseTabRestored(tab);
+
+ await checkDocumentReferrer(
+ getExpectedReferrer(REFERRER2),
+ "document.referrer is still correct after closing and reopening the tab."
+ );
+
+ tabState.entries[0].referrerInfo = null;
+ tabState.entries[0].referrer = REFERRER3;
+ await promiseTabState(tab, tabState);
+
+ await checkDocumentReferrer(
+ getExpectedReferrer(REFERRER3),
+ "document.referrer matches referrer set via setTabState using referrer."
+ );
+ gBrowser.removeCurrentTab();
+
+ // Restore the closed tab.
+ tab = ss.undoCloseTab(window, 0);
+ await promiseTabRestored(tab);
+
+ await checkDocumentReferrer(
+ getExpectedReferrer(REFERRER3),
+ "document.referrer is still correct after closing and reopening the tab."
+ );
+ gBrowser.removeCurrentTab();
+});