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diff --git a/addon-sdk/source/test/test-event-target.js b/addon-sdk/source/test/test-event-target.js
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+++ b/addon-sdk/source/test/test-event-target.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 { emit } = require('sdk/event/core');
+const { EventTarget } = require('sdk/event/target');
+const { Loader } = require('sdk/test/loader');
+
+exports['test add a listener'] = function(assert) {
+  let events = [ { name: 'event#1' }, 'event#2' ];
+  let target = EventTarget();
+
+  target.on('message', function(message) {
+    assert.equal(this, target, 'this is a target object');
+    assert.equal(message, events.shift(), 'message is emitted event');
+  });
+
+  emit(target, 'message', events[0]);
+  emit(target, 'message', events[0]);
+};
+
+exports['test pass in listeners'] = function(assert) {
+  let actual = [ ];
+  let target = EventTarget({
+    onMessage: function onMessage(message) {
+      assert.equal(this, target, 'this is an event target');
+      actual.push(1);
+    },
+    onFoo: null,
+    onbla: function() {
+      assert.fail('`onbla` is not supposed to be called');
+    }
+  });
+  target.on('message', function(message) {
+    assert.equal(this, target, 'this is an event target');
+    actual.push(2);
+  });
+
+  emit(target, 'message');
+  emit(target, 'missing');
+
+  assert.deepEqual([ 1, 2 ], actual, 'all listeners trigerred in right order');
+};
+
+exports['test that listener is unique per type'] = function(assert) {
+  let actual = []
+  let target = EventTarget();
+  function listener() { actual.push(1) }
+  target.on('message', listener);
+  target.on('message', listener);
+  target.on('message', listener);
+  target.on('foo', listener);
+  target.on('foo', listener);
+
+  emit(target, 'message');
+  assert.deepEqual([ 1 ], actual, 'only one message listener added');
+  emit(target, 'foo');
+  assert.deepEqual([ 1, 1 ], actual, 'same listener added for other event');
+};
+
+exports['test event type matters'] = function(assert) {
+  let target = EventTarget();
+  target.on('message', function() {
+    assert.fail('no event is expected');
+  });
+  target.on('done', function() {
+    assert.pass('event is emitted');
+  });
+
+  emit(target, 'foo');
+  emit(target, 'done');
+};
+
+exports['test all arguments are pasesd'] = function(assert) {
+  let foo = { name: 'foo' }, bar = 'bar';
+  let target = EventTarget();
+  target.on('message', function(a, b) {
+    assert.equal(a, foo, 'first argument passed');
+    assert.equal(b, bar, 'second argument passed');
+  });
+  emit(target, 'message', foo, bar);
+};
+
+exports['test no side-effects in emit'] = function(assert) {
+  let target = EventTarget();
+  target.on('message', function() {
+    assert.pass('first listener is called');
+    target.on('message', function() {
+      assert.fail('second listener is called');
+    });
+  });
+  emit(target, 'message');
+};
+
+exports['test order of propagation'] = function(assert) {
+  let actual = [];
+  let target = EventTarget();
+  target.on('message', function() { actual.push(1); });
+  target.on('message', function() { actual.push(2); });
+  target.on('message', function() { actual.push(3); });
+  emit(target, 'message');
+  assert.deepEqual([ 1, 2, 3 ], actual, 'called in order they were added');
+};
+
+exports['test remove a listener'] = function(assert) {
+  let target = EventTarget();
+  let actual = [];
+  target.on('message', function listener() {
+    actual.push(1);
+    target.on('message', function() {
+      target.removeListener('message', listener);
+      actual.push(2);
+    })
+  });
+
+  emit(target, 'message');
+  assert.deepEqual([ 1 ], actual, 'first listener called');
+  emit(target, 'message');
+  assert.deepEqual([ 1, 1, 2 ], actual, 'second listener called');
+  emit(target, 'message');
+  assert.deepEqual([ 1, 1, 2, 2, 2 ], actual, 'first listener removed');
+};
+
+exports['test .off() removes all listeners'] = function(assert) {
+  let target = EventTarget();
+  let actual = [];
+  target.on('message', function listener() {
+    actual.push(1);
+    target.on('message', function() {
+      target.removeListener('message', listener);
+      actual.push(2);
+    })
+  });
+
+  emit(target, 'message');
+  assert.deepEqual([ 1 ], actual, 'first listener called');
+  emit(target, 'message');
+  assert.deepEqual([ 1, 1, 2 ], actual, 'second listener called');
+  target.off();
+  emit(target, 'message');
+  assert.deepEqual([ 1, 1, 2 ], actual, 'target.off() removed all listeners');
+};
+
+exports['test error handling'] = function(assert) {
+  let target = EventTarget();
+  let error = Error('boom!');
+
+  target.on('message', function() { throw error; })
+  target.on('error', function(boom) {
+    assert.equal(boom, error, 'thrown exception causes error event');
+  });
+  emit(target, 'message');
+};
+
+exports['test unhandled errors'] = function(assert) {
+  let exceptions = [];
+  let loader = Loader(module);
+  let { emit } = loader.require('sdk/event/core');
+  let { EventTarget } = loader.require('sdk/event/target');
+  Object.defineProperties(loader.sandbox('sdk/event/core'), {
+    console: { value: {
+      exception: function(e) {
+        exceptions.push(e);
+      }
+    }}
+  });
+  let target = EventTarget();
+  let boom = Error('Boom!');
+  let drax = Error('Draax!!');
+
+  target.on('message', function() { throw boom; });
+
+  emit(target, 'message');
+  assert.ok(~String(exceptions[0]).indexOf('Boom!'),
+            'unhandled exception is logged');
+
+  target.on('error', function() { throw drax; });
+  emit(target, 'message');
+  assert.ok(~String(exceptions[1]).indexOf('Draax!'),
+            'error in error handler is logged');
+};
+
+exports['test target is chainable'] = function (assert, done) {
+  let loader = Loader(module);
+  let exceptions = [];
+  let { EventTarget } = loader.require('sdk/event/target');
+  let { emit } = loader.require('sdk/event/core');
+  Object.defineProperties(loader.sandbox('sdk/event/core'), {
+    console: { value: {
+      exception: function(e) {
+        exceptions.push(e);
+      }
+    }}
+  });
+
+  let emitter = EventTarget();
+  let boom = Error('Boom');
+  let onceCalled = 0;
+  
+  emitter.once('oneTime', function () {
+    assert.equal(++onceCalled, 1, 'once event called only once');
+  }).on('data', function (message) {
+    assert.equal(message, 'message', 'handles event');
+    emit(emitter, 'oneTime');
+    emit(emitter, 'data2', 'message2');
+  }).on('phony', function () {
+    assert.fail('removeListener does not remove chained event');
+  }).removeListener('phony')
+  .on('data2', function (message) {
+    assert.equal(message, 'message2', 'handle chained event');
+    emit(emitter, 'oneTime');
+    throw boom;
+  }).on('error', function (error) {
+    assert.equal(error, boom, 'error handled in chained event');
+    done();
+  });
+
+  emit(emitter, 'data', 'message');
+};
+
+require('sdk/test').run(exports);