1 files changed, 95 insertions, 0 deletions
diff --git a/browser/components/sessionstore/test/browser_1284886_suspend_tab.js b/browser/components/sessionstore/test/browser_1284886_suspend_tab.js
new file mode 100644
index 0000000000..3c6a2c1f2c
--- /dev/null
+++ b/browser/components/sessionstore/test/browser_1284886_suspend_tab.js
@@ -0,0 +1,95 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+add_task(async function test() {
+  await SpecialPowers.pushPrefEnv({
+    set: [["dom.require_user_interaction_for_beforeunload", false]],
+  });
+
+  let url = "about:robots";
+  let tab0 = gBrowser.tabs[0];
+  let tab1 = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+
+  const staleAttributes = [
+    "activemedia-blocked",
+    "busy",
+    "pendingicon",
+    "progress",
+    "soundplaying",
+  ];
+  for (let attr of staleAttributes) {
+    tab0.toggleAttribute(attr, true);
+  }
+  gBrowser.discardBrowser(tab0);
+  ok(!tab0.linkedPanel, "tab0 is suspended");
+  for (let attr of staleAttributes) {
+    ok(
+      !tab0.hasAttribute(attr),
+      `discarding browser removes "${attr}" tab attribute`
+    );
+  }
+
+  await BrowserTestUtils.switchTab(gBrowser, tab0);
+  ok(tab0.linkedPanel, "selecting tab unsuspends it");
+
+  // Test that active tab is not able to be suspended.
+  gBrowser.discardBrowser(tab0);
+  ok(tab0.linkedPanel, "active tab is not able to be suspended");
+
+  // Test that tab that is closing is not able to be suspended.
+  gBrowser._beginRemoveTab(tab1);
+  gBrowser.discardBrowser(tab1);
+
+  ok(tab1.linkedPanel, "cannot suspend a tab that is closing");
+
+  gBrowser._endRemoveTab(tab1);
+
+  // Open tab containing a page which has a beforeunload handler which shows a prompt.
+  url =
+    "http://example.com/browser/browser/components/sessionstore/test/browser_1284886_suspend_tab.html";
+  tab1 = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await BrowserTestUtils.switchTab(gBrowser, tab0);
+
+  // Test that tab with beforeunload handler which would show a prompt cannot be suspended.
+  gBrowser.discardBrowser(tab1);
+  ok(
+    tab1.linkedPanel,
+    "cannot suspend a tab with beforeunload handler which would show a prompt"
+  );
+
+  // Test that tab with beforeunload handler which would show a prompt will be suspended if forced.
+  gBrowser.discardBrowser(tab1, true);
+  ok(
+    !tab1.linkedPanel,
+    "force suspending a tab with beforeunload handler which would show a prompt"
+  );
+
+  BrowserTestUtils.removeTab(tab1);
+
+  // Open tab containing a page which has a beforeunload handler which does not show a prompt.
+  url =
+    "http://example.com/browser/browser/components/sessionstore/test/browser_1284886_suspend_tab_2.html";
+  tab1 = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  await BrowserTestUtils.switchTab(gBrowser, tab0);
+
+  // Test that tab with beforeunload handler which would not show a prompt can be suspended.
+  gBrowser.discardBrowser(tab1);
+  ok(
+    !tab1.linkedPanel,
+    "can suspend a tab with beforeunload handler which would not show a prompt"
+  );
+
+  BrowserTestUtils.removeTab(tab1);
+
+  // Test that non-remote tab is not able to be suspended.
+  url = "about:robots";
+  tab1 = BrowserTestUtils.addTab(gBrowser, url, { forceNotRemote: true });
+  await promiseBrowserLoaded(tab1.linkedBrowser, true, url);
+  await BrowserTestUtils.switchTab(gBrowser, tab1);
+  await BrowserTestUtils.switchTab(gBrowser, tab0);
+
+  gBrowser.discardBrowser(tab1);
+  ok(tab1.linkedPanel, "cannot suspend a remote tab");
+
+  BrowserTestUtils.removeTab(tab1);
+});