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diff --git a/addon-sdk/source/test/test-event-utils.js b/addon-sdk/source/test/test-event-utils.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 { on, emit } = require("sdk/event/core");
+const { filter, map, merge, expand, pipe, stripListeners } = require("sdk/event/utils");
+const $ = require("./event/helpers");
+
+function isEven(x) {
+  return !(x % 2);
+}
+function inc(x) {
+  return x + 1;
+}
+
+exports["test filter events"] = function(assert) {
+  let input = {};
+  let evens = filter(input, isEven);
+  let actual = [];
+  on(evens, "data", e => actual.push(e));
+
+  [1, 2, 3, 4, 5, 6, 7].forEach(x => emit(input, "data", x));
+
+  assert.deepEqual(actual, [2, 4, 6], "only even numbers passed through");
+};
+
+exports["test filter emits"] = $.emits(function(input, assert) {
+  let output = filter(input, isEven);
+  assert(output,  [1, 2, 3, 4, 5], [2, 4], "this is `output` & evens passed");
+});;
+
+exports["test filter reg once"] = $.registerOnce(function(input, assert) {
+  assert(filter(input, isEven),  [1, 2, 3, 4, 5, 6], [2, 4, 6],
+         "listener can be registered only once");
+});
+
+exports["test filter ignores new"] = $.ignoreNew(function(input, assert) {
+  assert(filter(input, isEven), [1, 2, 3], [2],
+         "new listener is ignored")
+});
+
+exports["test filter is FIFO"] = $.FIFO(function(input, assert) {
+  assert(filter(input, isEven), [1, 2, 3, 4], [2, 4],
+         "listeners are invoked in fifo order")
+});
+
+exports["test map events"] = function(assert) {
+  let input = {};
+  let incs = map(input, inc);
+  let actual = [];
+  on(incs, "data", e => actual.push(e));
+
+  [1, 2, 3, 4].forEach(x => emit(input, "data", x));
+
+  assert.deepEqual(actual, [2, 3, 4, 5], "all numbers were incremented");
+};
+
+exports["test map emits"] = $.emits(function(input, assert) {
+  let output = map(input, inc);
+  assert(output,  [1, 2, 3], [2, 3, 4], "this is `output` & evens passed");
+});
+
+exports["test map reg once"] = $.registerOnce(function(input, assert) {
+  assert(map(input, inc),  [1, 2, 3], [2, 3, 4],
+         "listener can be registered only once");
+});
+
+exports["test map ignores new"] = $.ignoreNew(function(input, assert) {
+  assert(map(input, inc), [1], [2],
+         "new listener is ignored")
+});
+
+exports["test map is FIFO"] = $.FIFO(function(input, assert) {
+  assert(map(input, inc), [1, 2, 3, 4], [2, 3, 4, 5],
+         "listeners are invoked in fifo order")
+});
+
+exports["test merge stream[stream]"] = function(assert) {
+  let a = {}, b = {}, c = {};
+  let inputs = {};
+  let actual = [];
+
+  on(merge(inputs), "data", $ => actual.push($))
+
+  emit(inputs, "data", a);
+  emit(a, "data", "a1");
+  emit(inputs, "data", b);
+  emit(b, "data", "b1");
+  emit(a, "data", "a2");
+  emit(inputs, "data", c);
+  emit(c, "data", "c1");
+  emit(c, "data", "c2");
+  emit(b, "data", "b2");
+  emit(a, "data", "a3");
+
+  assert.deepEqual(actual, ["a1", "b1", "a2", "c1", "c2", "b2", "a3"],
+                   "all inputs data merged into one");
+};
+
+exports["test merge array[stream]"] = function(assert) {
+  let a = {}, b = {}, c = {};
+  let inputs = {};
+  let actual = [];
+
+  on(merge([a, b, c]), "data", $ => actual.push($))
+
+  emit(a, "data", "a1");
+  emit(b, "data", "b1");
+  emit(a, "data", "a2");
+  emit(c, "data", "c1");
+  emit(c, "data", "c2");
+  emit(b, "data", "b2");
+  emit(a, "data", "a3");
+
+  assert.deepEqual(actual, ["a1", "b1", "a2", "c1", "c2", "b2", "a3"],
+                   "all inputs data merged into one");
+};
+
+exports["test merge emits"] = $.emits(function(input, assert) {
+  let evens = filter(input, isEven)
+  let output = merge([evens, input]);
+  assert(output, [1, 2, 3], [1, 2, 2, 3], "this is `output` & evens passed");
+});
+
+
+exports["test merge reg once"] = $.registerOnce(function(input, assert) {
+  let evens = filter(input, isEven)
+  let output = merge([input, evens]);
+  assert(output,  [1, 2, 3, 4], [1, 2, 2, 3, 4, 4],
+         "listener can be registered only once");
+});
+
+exports["test merge ignores new"] = $.ignoreNew(function(input, assert) {
+  let evens = filter(input, isEven)
+  let output = merge([input, evens])
+  assert(output, [1], [1],
+         "new listener is ignored")
+});
+
+exports["test marge is FIFO"] = $.FIFO(function(input, assert) {
+  let evens = filter(input, isEven)
+  let output = merge([input, evens])
+
+  assert(output, [1, 2, 3, 4], [1, 2, 2, 3, 4, 4],
+         "listeners are invoked in fifo order")
+});
+
+exports["test expand"] = function(assert) {
+  let a = {}, b = {}, c = {};
+  let inputs = {};
+  let actual = [];
+
+  on(expand(inputs, $ => $()), "data", $ => actual.push($))
+
+  emit(inputs, "data", () => a);
+  emit(a, "data", "a1");
+  emit(inputs, "data", () => b);
+  emit(b, "data", "b1");
+  emit(a, "data", "a2");
+  emit(inputs, "data", () => c);
+  emit(c, "data", "c1");
+  emit(c, "data", "c2");
+  emit(b, "data", "b2");
+  emit(a, "data", "a3");
+
+  assert.deepEqual(actual, ["a1", "b1", "a2", "c1", "c2", "b2", "a3"],
+                   "all inputs data merged into one");
+};
+
+exports["test pipe"] = function (assert, done) {
+  let src = {};
+  let dest = {};
+
+  let aneventCount = 0, multiargsCount = 0;
+  let wildcardCount = {};
+
+  on(dest, 'an-event', arg => {
+    assert.equal(arg, 'my-arg', 'piped argument to event');
+    ++aneventCount;
+    check();
+  });
+  on(dest, 'multiargs', (...data) => {
+    assert.equal(data[0], 'a', 'multiple arguments passed via pipe');
+    assert.equal(data[1], 'b', 'multiple arguments passed via pipe');
+    assert.equal(data[2], 'c', 'multiple arguments passed via pipe');
+    ++multiargsCount;
+    check();
+  });
+
+  on(dest, '*', (name, ...data) => {
+    wildcardCount[name] = (wildcardCount[name] || 0) + 1;
+    if (name === 'multiargs') {
+      assert.equal(data[0], 'a', 'multiple arguments passed via pipe, wildcard');
+      assert.equal(data[1], 'b', 'multiple arguments passed via pipe, wildcard');
+      assert.equal(data[2], 'c', 'multiple arguments passed via pipe, wildcard');
+    }
+    if (name === 'an-event')
+      assert.equal(data[0], 'my-arg', 'argument passed via pipe, wildcard');
+    check();
+  });
+
+  pipe(src, dest);
+
+  for (let i = 0; i < 3; i++)
+    emit(src, 'an-event', 'my-arg');
+
+  emit(src, 'multiargs', 'a', 'b', 'c');
+
+  function check () {
+    if (aneventCount === 3 && multiargsCount === 1 &&
+        wildcardCount['an-event'] === 3 &&
+        wildcardCount['multiargs'] === 1)
+      done();
+  }
+};
+
+exports["test pipe multiple targets"] = function (assert) {
+  let src1 = {};
+  let src2 = {};
+  let middle = {};
+  let dest = {};
+
+  pipe(src1, middle);
+  pipe(src2, middle);
+  pipe(middle, dest);
+
+  let middleFired = 0;
+  let destFired = 0;
+  let src1Fired = 0;
+  let src2Fired = 0;
+
+  on(src1, '*', () => src1Fired++);
+  on(src2, '*', () => src2Fired++);
+  on(middle, '*', () => middleFired++);
+  on(dest, '*', () => destFired++);
+
+  emit(src1, 'ev');
+  assert.equal(src1Fired, 1, 'event triggers in source in pipe chain');
+  assert.equal(middleFired, 1, 'event passes through the middle of pipe chain');
+  assert.equal(destFired, 1, 'event propagates to end of pipe chain');
+  assert.equal(src2Fired, 0, 'event does not fire on alternative chain routes');
+
+  emit(src2, 'ev');
+  assert.equal(src2Fired, 1, 'event triggers in source in pipe chain');
+  assert.equal(middleFired, 2,
+    'event passes through the middle of pipe chain from different src');
+  assert.equal(destFired, 2,
+    'event propagates to end of pipe chain from different src');
+  assert.equal(src1Fired, 1, 'event does not fire on alternative chain routes');
+
+  emit(middle, 'ev');
+  assert.equal(middleFired, 3,
+    'event triggers in source of pipe chain');
+  assert.equal(destFired, 3,
+    'event propagates to end of pipe chain from middle src');
+  assert.equal(src1Fired, 1, 'event does not fire on alternative chain routes');
+  assert.equal(src2Fired, 1, 'event does not fire on alternative chain routes');
+};
+
+exports['test stripListeners'] = function (assert) {
+  var options = {
+    onAnEvent: noop1,
+    onMessage: noop2,
+    verb: noop1,
+    value: 100
+  };
+
+  var stripped = stripListeners(options);
+  assert.ok(stripped !== options, 'stripListeners should return a new object');
+  assert.equal(options.onAnEvent, noop1, 'stripListeners does not affect original');
+  assert.equal(options.onMessage, noop2, 'stripListeners does not affect original');
+  assert.equal(options.verb, noop1, 'stripListeners does not affect original');
+  assert.equal(options.value, 100, 'stripListeners does not affect original');
+
+  assert.ok(!stripped.onAnEvent, 'stripListeners removes `on*` values');
+  assert.ok(!stripped.onMessage, 'stripListeners removes `on*` values');
+  assert.equal(stripped.verb, noop1, 'stripListeners leaves not `on*` values');
+  assert.equal(stripped.value, 100, 'stripListeners leaves not `on*` values');
+
+  function noop1 () {}
+  function noop2 () {}
+};
+
+require('sdk/test').run(exports);