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Mocha interface to write tests using Aria Templates style of `aria.jsunit.TestCase`.
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Mocha "interface" to write tests using Aria Templates style of aria.jsunit.TestCase.

Note that this is not exactly a mocha interface, but it simply converts Aria Templates tests in an equivalent BDD syntax.

The Aria Templates testing solution is originally designed for applications using Aria Templates. This interface allows to execute Aria Templates tests together with other less specialized unit tests, written in mocha and run in any runner that supports it.


This tool has to be used together with mocha and Aria Templates. So first set up mocha normally either using an HTML launcher or tools like testacular or testem.

Include all files inside lib folder and then interface.js

For a simple launcher page have a look at index.html or at testacular.conf.js for the testacular configuration file.

Writing tests

The base class for any Aria Templates test is aria.jsunit.TestCase. On top of basic assertions it allows to assert logs and events, it provides mocking and sandboxing. More advanced classes help in testing more specific use cases.

  • TestCase Ideal for pure JavaScript classes that don't need DOM interaction.
  • ModuleCtrlTestCase Provides helper methods to instantiate and test module controllers.
  • WidgetTestCase Better suited for testing widgets as it provides a controlled environment where to safely create widgets without the need of real template
  • TemplateTestCase Base class for testing the DOM. Loads a template in a test area and provide methods to simulate the user interaction.
  • RobotTestCase Advanced class for DOM testing. It extends from TemplateTestCase and in addition uses a Java applet to control the mouse and keyboard for a true interaction.


Here is an example of unit test class

    $classpath : "SyncTest",
    $extends : "aria.jsunit.TestCase",
    $prototype : {
        testAssertTrue : function () {
            this.assertTrue(false, "This assertion is false");

A Test Case (cf. API doc) will usually feature several single test methods. All tests are supposed to be completely independent from each other, and the order in which they are executed should not be taken into consideration.

When running a TestCase, all the methods defined in the prototype and with a name starting with test will be considered as test methods. It is mandatory to follow this naming convention.

The scope of a test method is the test case and no return value is expected. The status of the test is determined by the result of the various asserts made during this test. A test method containing no failing assert is considered as successful if no JavaScript error was thrown during its execution.


The possible assertions that can be done from within a test case are defined in aria.jsunit.Assert and are

  • assertTrue / assertFalse Test if a value is true or false
this.assertTrue("a truthy value");  // assert fail
  • assertEquals / assertNotEquals Test that two values are strictly equal
var number = 12;
this.assertEquals(number, 12);   // true
this.assertEquals(number, "12"); // false
  • assertJsonEquals / assertJsonNotEquals Test for deep equality of objects / array
this.assertEquals([1, 2], [1, 2]); // false
this.assertJsonEquals([1, 2], [1, 2]); // true
    one : 1,
    two : 2
}, {
    two : 2,
    one : 1
});    // true
  • assertJsonContains Assert that an object is included in a bigger container
var serverResponse = {
    one : 1,
    two : 2,
    // other values
    end : "eventually"
this.assertJsonContains(serverResponse, {
    one : 1
});   // true
  • assertLogsEmpty Test that no class logged an error message

  • assertErrorInLogs Test that a precise error has been logged

someClass.$raiseError("Error while having fun");
this.assertErrorInLogs("Error while having fun");   // true

Error messages for which a corresponding assertion is not performed will make the test fail

  • fail Explicitly let the test fail with a given message
if (number > 10) {"I'd like a smaller number");

Asynchronous testing

Asynchronous tests are a special kind of test methods, and their name should start with testAsync

The easiest way to do an asynchronous test is to directly call the asynchronous method, passing a callback defined in the Test Case. This callback will then be responsible of notifying the tester when the test is finished.

The callback can be defined in the prototype of the Test Case, but in this case, make sure its name doesn't start with test, otherwise it will be picked up and executed on its own as a test method.

To notify the test runner, aria.jsunit.TestCase provides the notifyTestEnd method.

    $classpath : "AsyncTest",
    $extends : "aria.jsunit.TestCase",
    $prototype : {
        testAsyncMethod : function () {
                fn : this.methodCallback,
                scope : this

        methodCallback : function () {

Fixtures : setUp / tearDown

If several tests in a single test case are using the same kind of objects in their tests, it can be interesting to define the setUp and tearDown methods in the $prototype of the TestCase. These two methods are called before and after each test method.

    $classpath : "Fixtures",
    $extends : "aria.jsunit.TestCase",
    $prototype : {
        countSetUp : 0,      // 2 at the end of testing
        countTearDown : 0,   // 2 at the end of testing

        setUp : function () {
            this.countSetUp += 1;

        tearDown : function () {
            this.countTearDown += 1;

        testOne : function () {},

        testTwo : function () {}

Listening events

In some cases we want to assert that an event has been raised or not by a given class. This is a basic form of spy.

Assert provides the following methods

  • registerObject / unregisterObject Listen to all events fired by a given object
  • assertEventFired / assertEventNotFired Assert that en event with a given name has been raised
  • getEvent Get the event object of a given event name, useful to assert that parameters are passed correctly.

The following is an example test case using assertEventFired

    $classpath : "Events",
    $extends : "aria.jsunit.TestCase",
    $dependencies : ["anotherClass"],
    $prototype : {
        testEventFired : function () {
            // We mu register an object to be able to assert that it's raising events

            // Call a method that raises an event


Note that the test runner automatically calls unregisterObject and clearLogs at the end of each test method.


To contribute, clone the project and then

npm install
testacular start

There's already a list of tests inside test folder. Just create a new test case and share your code.

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