diff -r 000000000000 -r 6474c204b198 addon-sdk/source/test/addons/tab-close-on-startup/main.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/addon-sdk/source/test/addons/tab-close-on-startup/main.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,29 @@
+'use strict';
+
+const { setTimeout } = require('sdk/timers');
+const tabs = require('sdk/tabs');
+
+let 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);
+}