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diff --git a/toolkit/jetpack/sdk/test/assert.js b/toolkit/jetpack/sdk/test/assert.js
new file mode 100644
index 000000000..8478c8414
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+++ b/toolkit/jetpack/sdk/test/assert.js
@@ -0,0 +1,366 @@
+/* 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";
+
+module.metadata = {
+  "stability": "unstable"
+};
+
+const { isFunction, isNull, isObject, isString,
+        isRegExp, isArray, isDate, isPrimitive,
+        isUndefined, instanceOf, source } = require("../lang/type");
+
+/**
+ * The `AssertionError` is defined in assert.
+ * @extends Error
+ * @example
+ *  new assert.AssertionError({
+ *    message: message,
+ *    actual: actual,
+ *    expected: expected
+ *  })
+ */
+function AssertionError(options) {
+  let assertionError = Object.create(AssertionError.prototype);
+
+  if (isString(options))
+    options = { message: options };
+  if ("actual" in options)
+    assertionError.actual = options.actual;
+  if ("expected" in options)
+    assertionError.expected = options.expected;
+  if ("operator" in options)
+    assertionError.operator = options.operator;
+
+  assertionError.message = options.message;
+  assertionError.stack = new Error().stack;
+  return assertionError;
+}
+AssertionError.prototype = Object.create(Error.prototype, {
+  constructor: { value: AssertionError },
+  name: { value: "AssertionError", enumerable: true },
+  toString: { value: function toString() {
+    let value;
+    if (this.message) {
+      value = this.name + " : " + this.message;
+    }
+    else {
+      value = [
+        this.name + " : ",
+        source(this.expected),
+        this.operator,
+        source(this.actual)
+      ].join(" ");
+    }
+    return value;
+  }}
+});
+exports.AssertionError = AssertionError;
+
+function Assert(logger) {
+  let assert = Object.create(Assert.prototype, { _log: { value: logger }});
+
+  assert.fail = assert.fail.bind(assert);
+  assert.pass = assert.pass.bind(assert);
+
+  return assert;
+}
+
+Assert.prototype = {
+  fail: function fail(e) {
+    if (!e || typeof(e) !== 'object') {
+      this._log.fail(e);
+      return;
+    }
+    let message = e.message;
+    try {
+      if ('operator' in e) {
+        message += [
+          " -",
+          source(e.actual),
+          e.operator,
+          source(e.expected)
+        ].join(" ");
+      }
+    }
+    catch(e) {}
+    this._log.fail(message);
+  },
+  pass: function pass(message) {
+    this._log.pass(message);
+    return true;
+  },
+  error: function error(e) {
+    this._log.exception(e);
+  },
+  ok: function ok(value, message) {
+    if (!!!value) {
+      this.fail({
+        actual: value,
+        expected: true,
+        message: message,
+        operator: "=="
+      });
+      return false;
+    }
+
+    this.pass(message);
+    return true;
+  },
+
+  /**
+   * The equality assertion tests shallow, coercive equality with `==`.
+   * @example
+   *    assert.equal(1, 1, "one is one");
+   */
+  equal: function equal(actual, expected, message) {
+    if (actual == expected) {
+      this.pass(message);
+      return true;
+    }
+
+    this.fail({
+      actual: actual,
+      expected: expected,
+      message: message,
+      operator: "=="
+    });
+    return false;
+  },
+
+  /**
+   * The non-equality assertion tests for whether two objects are not equal
+   * with `!=`.
+   * @example
+   *    assert.notEqual(1, 2, "one is not two");
+   */
+  notEqual: function notEqual(actual, expected, message) {
+    if (actual != expected) {
+      this.pass(message);
+      return true;
+    }
+
+    this.fail({
+      actual: actual,
+      expected: expected,
+      message: message,
+      operator: "!=",
+    });
+    return false;
+  },
+
+  /**
+   * The equivalence assertion tests a deep (with `===`) equality relation.
+   * @example
+   *    assert.deepEqual({ a: "foo" }, { a: "foo" }, "equivalent objects")
+   */
+   deepEqual: function deepEqual(actual, expected, message) {
+    if (isDeepEqual(actual, expected)) {
+      this.pass(message);
+      return true;
+    }
+
+    this.fail({
+      actual: actual,
+      expected: expected,
+      message: message,
+      operator: "deepEqual"
+    });
+    return false;
+  },
+
+  /**
+   * The non-equivalence assertion tests for any deep (with `===`) inequality.
+   * @example
+   *    assert.notDeepEqual({ a: "foo" }, Object.create({ a: "foo" }),
+   *                        "object's inherit from different prototypes");
+   */
+  notDeepEqual: function notDeepEqual(actual, expected, message) {
+    if (!isDeepEqual(actual, expected)) {
+      this.pass(message);
+      return true;
+    }
+
+    this.fail({
+      actual: actual,
+      expected: expected,
+      message: message,
+      operator: "notDeepEqual"
+    });
+    return false;
+  },
+
+  /**
+   * The strict equality assertion tests strict equality, as determined by
+   * `===`.
+   * @example
+   *    assert.strictEqual(null, null, "`null` is `null`")
+   */
+  strictEqual: function strictEqual(actual, expected, message) {
+    if (actual === expected) {
+      this.pass(message);
+      return true;
+    }
+
+    this.fail({
+      actual: actual,
+      expected: expected,
+      message: message,
+      operator: "==="
+    });
+    return false;
+  },
+
+  /**
+   * The strict non-equality assertion tests for strict inequality, as
+   * determined by `!==`.
+   * @example
+   *    assert.notStrictEqual(null, undefined, "`null` is not `undefined`");
+   */
+  notStrictEqual: function notStrictEqual(actual, expected, message) {
+    if (actual !== expected) {
+      this.pass(message);
+      return true;
+    }
+
+    this.fail({
+      actual: actual,
+      expected: expected,
+      message: message,
+      operator: "!=="
+    });
+    return false;
+  },
+
+  /**
+   * The assertion whether or not given `block` throws an exception. If optional
+   * `Error` argument is provided and it's type of function thrown error is
+   * asserted to be an instance of it, if type of `Error` is string then message
+   * of throw exception is asserted to contain it.
+   * @param {Function} block
+   *    Function that is expected to throw.
+   * @param {Error|RegExp} [Error]
+   *    Error constructor that is expected to be thrown or a string that
+   *    must be contained by a message of the thrown exception, or a RegExp
+   *    matching a message of the thrown exception.
+   * @param {String} message
+   *    Description message
+   *
+   * @examples
+   *
+   *    assert.throws(function block() {
+   *      doSomething(4)
+   *    }, "Object is expected", "Incorrect argument is passed");
+   *
+   *    assert.throws(function block() {
+   *      Object.create(5)
+   *    }, TypeError, "TypeError is thrown");
+   */
+  throws: function throws(block, Error, message) {
+    let threw = false;
+    let exception = null;
+
+    // If third argument is not provided and second argument is a string it
+    // means that optional `Error` argument was not passed, so we shift
+    // arguments.
+    if (isString(Error) && isUndefined(message)) {
+      message = Error;
+      Error = undefined;
+    }
+
+    // Executing given `block`.
+    try {
+      block();
+    }
+    catch (e) {
+      threw = true;
+      exception = e;
+    }
+
+    // If exception was thrown and `Error` argument was not passed assert is
+    // passed.
+    if (threw && (isUndefined(Error) ||
+                 // If passed `Error` is RegExp using it's test method to
+                 // assert thrown exception message.
+                 (isRegExp(Error) && (Error.test(exception.message) || Error.test(exception.toString()))) ||
+                 // If passed `Error` is a constructor function testing if
+                 // thrown exception is an instance of it.
+                 (isFunction(Error) && instanceOf(exception, Error))))
+    {
+      this.pass(message);
+      return true;
+    }
+
+    // Otherwise we report assertion failure.
+    let failure = {
+      message: message,
+      operator: "matches"
+    };
+
+    if (exception) {
+      failure.actual = exception.message || exception.toString();
+    }
+
+    if (Error) {
+      failure.expected = Error.toString();
+    }
+
+    this.fail(failure);
+    return false;
+  }
+};
+exports.Assert = Assert;
+
+function isDeepEqual(actual, expected) {
+  // 7.1. All identical values are equivalent, as determined by ===.
+  if (actual === expected) {
+    return true;
+  }
+
+  // 7.2. If the expected value is a Date object, the actual value is
+  // equivalent if it is also a Date object that refers to the same time.
+  else if (isDate(actual) && isDate(expected)) {
+    return actual.getTime() === expected.getTime();
+  }
+
+  // XXX specification bug: this should be specified
+  else if (isPrimitive(actual) || isPrimitive(expected)) {
+    return expected === actual;
+  }
+
+  // 7.3. Other pairs that do not both pass typeof value == "object",
+  // equivalence is determined by ==.
+  else if (!isObject(actual) && !isObject(expected)) {
+    return actual == expected;
+  }
+
+  // 7.4. For all other Object pairs, including Array objects, equivalence is
+  // determined by having the same number of owned properties (as verified
+  // with Object.prototype.hasOwnProperty.call), the same set of keys
+  // (although not necessarily the same order), equivalent values for every
+  // corresponding key, and an identical "prototype" property. Note: this
+  // accounts for both named and indexed properties on Arrays.
+  else {
+    return actual.prototype === expected.prototype &&
+           isEquivalent(actual, expected);
+  }
+}
+
+function isEquivalent(a, b, stack) {
+  let aKeys = Object.keys(a);
+  let bKeys = Object.keys(b);
+
+  return aKeys.length === bKeys.length &&
+          isArrayEquivalent(aKeys.sort(), bKeys.sort()) &&
+          aKeys.every(function(key) {
+            return isDeepEqual(a[key], b[key], stack)
+          });
+}
+
+function isArrayEquivalent(a, b, stack) {
+  return isArray(a) && isArray(b) &&
+         a.every(function(value, index) {
+           return isDeepEqual(value, b[index]);
+         });
+}