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+<!DOCTYPE html>
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+
+<html>
+
+  <head>
+    <meta charset="utf8">
+    <title></title>
+
+    <script type="application/javascript"
+            src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+    <link rel="stylesheet" type="text/css"
+          href="chrome://mochikit/content/tests/SimpleTest/test.css">
+  </head>
+
+  <body>
+
+    <script type="application/javascript;version=1.8">
+      "use strict";
+
+      const { utils: Cu } = Components;
+      const { require } = Cu.import("resource://devtools/shared/Loader.jsm", {});
+      const promise = require("promise");
+      const EventEmitter = require("devtools/shared/event-emitter");
+      const { Task } = require("devtools/shared/task");
+
+      SimpleTest.waitForExplicitFinish();
+
+      testEmitter();
+      testEmitter({});
+
+      Task.spawn(testPromise)
+          .then(null, ok.bind(null, false))
+          .then(SimpleTest.finish);
+
+      function testEmitter(aObject) {
+        let emitter;
+
+        if (aObject) {
+          emitter = aObject;
+          EventEmitter.decorate(emitter);
+        } else {
+          emitter = new EventEmitter();
+        }
+
+        ok(emitter, "We have an event emitter");
+
+        let beenHere1 = false;
+        let beenHere2 = false;
+
+        emitter.on("next", next);
+        emitter.emit("next", "abc", "def");
+
+        function next(eventName, str1, str2) {
+          is(eventName, "next", "Got event");
+          is(str1, "abc", "Argument 1 is correct");
+          is(str2, "def", "Argument 2 is correct");
+
+          ok(!beenHere1, "first time in next callback");
+          beenHere1 = true;
+
+          emitter.off("next", next);
+
+          emitter.emit("next");
+
+          emitter.once("onlyonce", onlyOnce);
+
+          emitter.emit("onlyonce");
+          emitter.emit("onlyonce");
+        }
+
+        function onlyOnce() {
+          ok(!beenHere2, "\"once\" listener has been called once");
+          beenHere2 = true;
+          emitter.emit("onlyonce");
+
+          testThrowingExceptionInListener();
+        }
+
+        function testThrowingExceptionInListener() {
+          function throwListener() {
+            emitter.off("throw-exception");
+            throw {
+              toString: () => "foo",
+              stack: "bar",
+            };
+          }
+
+          emitter.on("throw-exception", throwListener);
+          emitter.emit("throw-exception");
+
+          killItWhileEmitting();
+        }
+
+        function killItWhileEmitting() {
+          function c1() {
+            ok(true, "c1 called");
+          }
+          function c2() {
+            ok(true, "c2 called");
+            emitter.off("tick", c3);
+          }
+          function c3() {
+            ok(false, "c3 should not be called");
+          }
+          function c4() {
+            ok(true, "c4 called");
+          }
+
+          emitter.on("tick", c1);
+          emitter.on("tick", c2);
+          emitter.on("tick", c3);
+          emitter.on("tick", c4);
+
+          emitter.emit("tick");
+
+          offAfterOnce();
+        }
+
+        function offAfterOnce() {
+          let enteredC1 = false;
+
+          function c1() {
+            enteredC1 = true;
+          }
+
+          emitter.once("oao", c1);
+          emitter.off("oao", c1);
+
+          emitter.emit("oao");
+
+          ok(!enteredC1, "c1 should not be called");
+        }
+      }
+
+      function testPromise() {
+        let emitter = new EventEmitter();
+        let p = emitter.once("thing");
+
+        // Check that the promise is only resolved once event though we
+        // emit("thing") more than once
+        let firstCallbackCalled = false;
+        let check1 = p.then(arg => {
+          is(firstCallbackCalled, false, "first callback called only once");
+          firstCallbackCalled = true;
+          is(arg, "happened", "correct arg in promise");
+          return "rval from c1";
+        });
+
+        emitter.emit("thing", "happened", "ignored");
+
+        // Check that the promise is resolved asynchronously
+        let secondCallbackCalled = false;
+        let check2 = p.then(arg => {
+          ok(true, "second callback called");
+          is(arg, "happened", "correct arg in promise");
+          secondCallbackCalled = true;
+          is(arg, "happened", "correct arg in promise (a second time)");
+          return "rval from c2";
+        });
+
+        // Shouldn't call any of the above listeners
+        emitter.emit("thing", "trashinate");
+
+        // Check that we can still separate events with different names
+        // and that it works with no parameters
+        let pfoo = emitter.once("foo");
+        let pbar = emitter.once("bar");
+
+        let check3 = pfoo.then(arg => {
+          ok(arg === undefined, "no arg for foo event");
+          return "rval from c3";
+        });
+
+        pbar.then(() => {
+          ok(false, "pbar should not be called");
+        });
+
+        emitter.emit("foo");
+
+        is(secondCallbackCalled, false, "second callback not called yet");
+
+        return promise.all([ check1, check2, check3 ]).then(args => {
+          is(args[0], "rval from c1", "callback 1 done good");
+          is(args[1], "rval from c2", "callback 2 done good");
+          is(args[2], "rval from c3", "callback 3 done good");
+        });
+      }
+    </script>
+  </body>
+</html>