1 files changed, 55 insertions, 0 deletions
diff --git a/browser/components/sessionstore/test/browser_replace_load.js b/browser/components/sessionstore/test/browser_replace_load.js
new file mode 100644
index 0000000000..64df429b63
--- /dev/null
+++ b/browser/components/sessionstore/test/browser_replace_load.js
@@ -0,0 +1,55 @@
+"use strict";
+
+const STATE = {
+  entries: [{ url: "about:robots" }, { url: "about:mozilla" }],
+  selected: 2,
+};
+
+/**
+ * Bug 1100223. Calling browser.loadURI() while a tab is loading causes
+ * sessionstore to override the desired target URL. This test ensures that
+ * calling loadURI() on a pending tab causes the tab to no longer be marked
+ * as pending and correctly finish the instructed load while keeping the
+ * restored history around.
+ */
+add_task(async function() {
+  await testSwitchToTab("about:mozilla#fooobar", {
+    ignoreFragment: "whenComparingAndReplace",
+  });
+  await testSwitchToTab("about:mozilla?foo=bar", { replaceQueryString: true });
+});
+
+var testSwitchToTab = async function(url, options) {
+  // Create a background tab.
+  let tab = BrowserTestUtils.addTab(gBrowser, "about:blank");
+  let browser = tab.linkedBrowser;
+  await promiseBrowserLoaded(browser);
+
+  // The tab shouldn't be restored right away.
+  Services.prefs.setBoolPref("browser.sessionstore.restore_on_demand", true);
+
+  // Prepare the tab state.
+  let promise = promiseTabRestoring(tab);
+  ss.setTabState(tab, JSON.stringify(STATE));
+  ok(tab.hasAttribute("pending"), "tab is pending");
+  await promise;
+
+  options.triggeringPrincipal = Services.scriptSecurityManager.getSystemPrincipal();
+
+  // Switch-to-tab with a similar URI.
+  switchToTabHavingURI(url, false, options);
+
+  // Tab should now restore
+  await promiseTabRestored(tab);
+  is(browser.currentURI.spec, url, "correct URL loaded");
+
+  // Check that we didn't lose any history entries.
+  await SpecialPowers.spawn(browser, [], async function() {
+    let webNavigation = docShell.QueryInterface(Ci.nsIWebNavigation);
+    let history = webNavigation.sessionHistory;
+    Assert.equal(history && history.count, 3, "three history entries");
+  });
+
+  // Cleanup.
+  gBrowser.removeTab(tab);
+};