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diff --git a/addon-sdk/source/test/test-tab.js b/addon-sdk/source/test/test-tab.js
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+++ b/addon-sdk/source/test/test-tab.js
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+"use strict";
+
+const tabs = require("sdk/tabs");
+const windowUtils = require("sdk/deprecated/window-utils");
+const windows = require("sdk/windows").browserWindows;
+const app = require("sdk/system/xul-app");
+const { viewFor } = require("sdk/view/core");
+const { modelFor } = require("sdk/model/core");
+const { getBrowserForTab, getTabId, isTab } = require("sdk/tabs/utils");
+const { defer } = require("sdk/lang/functional");
+
+function tabExistenceInTabs(assert, found, tab, tabs) {
+  let tabFound = false;
+
+  for (let t of tabs) {
+    assert.notEqual(t.title, undefined, 'tab title is not undefined');
+    assert.notEqual(t.url, undefined, 'tab url is not undefined');
+    assert.notEqual(t.index, undefined, 'tab index is not undefined');
+
+    if (t === tab) {
+      tabFound = true;
+      break;
+    }
+  }
+
+  // check for the tab's existence
+  if (found)
+    assert.ok(tabFound, 'the tab was found as expected');
+  else
+    assert.ok(!tabFound, 'the tab was not found as expected');
+}
+
+exports.testBehaviorOnCloseAfterReady = function(assert, done) {
+  tabs.open({
+    url: "about:mozilla",
+    onReady: function(tab) {
+      assert.equal(tab.url, "about:mozilla", "Tab has the expected url");
+      // if another test ends before closing a tab then index != 1 here
+      assert.ok(tab.index >= 1, "Tab has the expected index, a value greater than 0");
+
+      let testTabFound = tabExistenceInTabs.bind(null, assert, true, tab);
+      let testTabNotFound = tabExistenceInTabs.bind(null, assert, false, tab);
+
+      // tab in require("sdk/tabs") ?
+      testTabFound(tabs);
+      // tab was found in require("sdk/windows").windows.activeWindow.tabs ?
+      let activeWindowTabs = windows.activeWindow.tabs;
+      testTabFound(activeWindowTabs);
+
+      tab.close(function () {
+        assert.equal(tab.url, undefined,
+                     "After being closed, tab attributes are undefined (url)");
+        assert.equal(tab.index, undefined,
+                     "After being closed, tab attributes are undefined (index)");
+
+        tab.destroy();
+
+        testTabNotFound(tabs);
+        testTabNotFound(windows.activeWindow.tabs);
+        testTabNotFound(activeWindowTabs);
+
+        // Ensure that we can call destroy multiple times without throwing
+        tab.destroy();
+
+        testTabNotFound(tabs);
+        testTabNotFound(windows.activeWindow.tabs);
+        testTabNotFound(activeWindowTabs);
+
+        done();
+      });
+    }
+  });
+};
+
+exports.testBug844492 = function(assert, done) {
+  const activeWindowTabs = windows.activeWindow.tabs;
+  let openedTabs = 0;
+
+  tabs.on('open', function onOpenTab(tab) {
+    openedTabs++;
+
+    let testTabFound = tabExistenceInTabs.bind(null, assert, true, tab);
+    let testTabNotFound = tabExistenceInTabs.bind(null, assert, false, tab);
+
+    testTabFound(tabs);
+    testTabFound(windows.activeWindow.tabs);
+    testTabFound(activeWindowTabs);
+
+    tab.close();
+
+    testTabNotFound(tabs);
+    testTabNotFound(windows.activeWindow.tabs);
+    testTabNotFound(activeWindowTabs);
+
+    if (openedTabs >= 2) {
+      tabs.removeListener('open', onOpenTab);
+      done();
+    }
+  });
+
+  tabs.open({ url: 'about:mozilla' });
+  tabs.open({ url: 'about:mozilla' });
+};
+
+exports.testBehaviorOnCloseAfterOpen = function(assert, done) {
+  tabs.open({
+    url: "about:mozilla",
+    onOpen: function(tab) {
+      assert.notEqual(tab.url, undefined, "Tab has a url");
+      assert.ok(tab.index >= 1, "Tab has the expected index");
+
+      let testTabFound = tabExistenceInTabs.bind(null, assert, true, tab);
+      let testTabNotFound = tabExistenceInTabs.bind(null, assert, false, tab);
+
+      // tab in require("sdk/tabs") ?
+      testTabFound(tabs);
+      // tab was found in require("sdk/windows").windows.activeWindow.tabs ?
+      let activeWindowTabs = windows.activeWindow.tabs;
+      testTabFound(activeWindowTabs);
+
+      tab.close(function () {
+        assert.equal(tab.url, undefined,
+                     "After being closed, tab attributes are undefined (url)");
+        assert.equal(tab.index, undefined,
+                     "After being closed, tab attributes are undefined (index)");
+
+        tab.destroy();
+
+        if (app.is("Firefox")) {
+          // Ensure that we can call destroy multiple times without throwing;
+          // Fennec doesn't use this internal utility
+          tab.destroy();
+          tab.destroy();
+        }
+
+        testTabNotFound(tabs);
+        testTabNotFound(windows.activeWindow.tabs);
+        testTabNotFound(activeWindowTabs);
+
+        // Ensure that we can call destroy multiple times without throwing
+        tab.destroy();
+
+        testTabNotFound(tabs);
+        testTabNotFound(windows.activeWindow.tabs);
+        testTabNotFound(activeWindowTabs);
+
+        done();
+      });
+    }
+  });
+};
+
+exports["test viewFor(tab)"] = (assert, done) => {
+  // Note we defer handlers as length collection is updated after
+  // handler is invoked, so if test is finished before counnts are
+  // updated wrong length will show up in followup tests.
+  tabs.once("open", defer(tab => {
+    const view = viewFor(tab);
+    assert.ok(view, "view is returned");
+    assert.equal(getTabId(view), tab.id, "tab has a same id");
+
+    tab.close(defer(done));
+  }));
+
+  tabs.open({ url: "about:mozilla" });
+};
+
+
+exports["test modelFor(xulTab)"] = (assert, done) => {
+  tabs.open({
+    url: "about:mozilla",
+    onReady: tab => {
+      const view = viewFor(tab);
+      assert.ok(view, "view is returned");
+      assert.ok(isTab(view), "view is underlaying tab");
+      assert.equal(getTabId(view), tab.id, "tab has a same id");
+      assert.equal(modelFor(view), tab, "modelFor(view) is SDK tab");
+
+      tab.close(defer(done));
+    }
+  });
+};
+
+exports["test tab.readyState"] = (assert, done) => {
+  tabs.open({
+    url: "data:text/html;charset=utf-8,test_readyState",
+    onOpen: (tab) => {
+      assert.notEqual(["uninitialized", "loading"].indexOf(tab.readyState), -1,
+        "tab is either uninitialized or loading when onOpen");
+    },
+    onReady: (tab) => {
+      assert.notEqual(["interactive", "complete"].indexOf(tab.readyState), -1,
+        "tab is either interactive or complete when onReady");
+    },
+    onLoad: (tab) => {
+      assert.equal(tab.readyState, "complete", "tab is complete onLoad");
+      tab.close(defer(done));
+    }
+  });
+}
+
+exports["test tab.readyState for existent tabs"] = function* (assert) {
+  assert.equal(tabs.length, 1, "tabs contains an existent tab");
+
+  function frameScript() {
+    sendAsyncMessage("test:contentDocument.readyState", content.document.readyState);
+  }
+
+  for (let tab of tabs) {
+    let browserForTab = getBrowserForTab(viewFor(tab));
+    let mm = browserForTab.messageManager;
+
+    yield new Promise((resolve) => {
+      mm.addMessageListener("test:contentDocument.readyState", function listener(evt) {
+        mm.removeMessageListener("test:contentDocument.readyState", listener);
+        assert.equal(evt.data, tab.readyState,
+                     "tab.readyState has the same value of the associated contentDocument.readyState CPOW");
+        resolve();
+      });
+      mm.loadFrameScript(`data:,new ${frameScript};`, false);
+    });
+  }
+}
+
+require("sdk/test").run(module.exports);