import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

addon-sdk/source/test/addons/tab-close-on-startup/main.js

@@ -0,0 +1,31 @@
+/* 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 { setTimeout } = require('sdk/timers');
+const tabs = require('sdk/tabs');
+
+var closeEvents = 0;
+const closeEventDetector = _ => closeEvents++;
+
+exports.testNoTabCloseOnStartup = function(assert, done) {
+  setTimeout(_ => {
+    assert.equal(closeEvents, 0, 'there were no tab close events detected');
+    tabs.open({
+      url: 'about:mozilla',
+      inBackground: true,
+      onReady: tab => tab.close(),
+      onClose: _ => {
+        assert.equal(closeEvents, 1, 'there was one tab close event detected');
+        done();
+      }
+    })
+  });
+}
+
+exports.main = function() {
+  tabs.on('close', closeEventDetector);
+
+  require("sdk/test/runner").runTestsFromModule(module);
+}