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Unit Testing – About Unit Testing

This guide covers the SproutCore unit test API and some ideas on how to use it. After reading this guide, you will:

  • Know how to create your unit tests and where to locate them.
  • How to run your tests.
  • How to get the most out of unit testing in SproutCore.

endprologue.

Overview

Rigorous unit testing is a key principle to modern agile development.
Unit tests not only make it easier for other developers to understand and work with your code,
it makes it easier for you to maintain your own code as well.

In the past, unit testing JavaScript has been a difficult process,
primarily because the infrastructure needed to run unit tests required a lot of manual setup.

SproutCore makes unit testing far easier by bundling an integrated
testing framework as well as a test runner right into the build tools. The testing framework is based on
jQuery’s QUint.

How it Works

Where Unit Test Files Are Stored

Unit test files are stored in a directory, tests, under your SproutCore application subfolder.
For example, if your application is named hello_world, then the tests folder will have this project path:

hello_world/apps/hello_world/tests

If this folder doesn’t already exist for you, then add it at this time.

Adding Unit Test Files

When you create a code file using sc-gen, it will automatically generate the skeleton for a unit test that you can enhance to test your code file. Then simply open the test file and write some tests.

To add a unit test file manually, simply create it inside the tests directory.

See Adding a Unit Test for more information on this process.

Writing Unit Test Cases

Once you’ve added a unit test file, write your unit test cases using
the QUnit testing API. A simple unit test looks like this:

module(“HelloWorld”) ;
test("value of ‘string’ is ‘Hello World’, function() {
ok(HelloWorld.get(‘string’), ‘Hello World’, “has preset string”);
});

See Writing a Unit Test Case for more information on this process.

Running Unit Test Cases

The test runner is activated when you launch sc_server.

You run all the tests by simply browsing
http://localhost:4020/sproutcore/tests.

You can also test a subset of unit tests; see Running Unit Test Cases
for more information.

WARNING: The test runner is not currently operational on 1.5. Unit tests have to be run manually.
This will be fixed prior to release. See the above link for more information.

Getting the Most Out of Unit Testing

To get the best results out of your test running, you should get into
the habit of adding unit tests for every major function in your application.
It is not necessary to add unit tests for every single method you write,
but you should make sure your unit tests cover the major pieces of your app
that are stitched together with bindings. This is especially important for
any complicated engines or for components with a large number of moving parts
since they tend to break easily.

Assuming you have good unit tests, you should also make sure everyone in
your team runs all of the unit tests at least once before committing any
changes to your source repository. Try to never commit source changes that
leave tests failing. This way unit tests will remain a useful check for every
developer on the project to ensure they have not broken another piece of the code.

In order to achieve the best test coverage, you need to run your unit tests in
every target web browser you intend to run your application in. For example,
when we write SproutCore code, we will load the test runner in IE6, IE7, IE8,
Safari, Chrome, and Firefox. Since running unit tests this many times can
become very labor intensive if you try to do it before every checkin,
usually the best thing to do is to run your unit tests before every
checkin in only one or two browsers such as Firefox and Safari.
Periodically you should set milestones in your project development where
you will run through the unit tests on all browsers and fix anything that
breaks unit tests for continuing with your development.

Above all, the most important thing about unit testing is to write and run
your unit tests regularly. Unit tests are only useful if you maintain them.
If you write too much code that is not covered by unit tests, they will not
prevent enough errors for people on your team to use them regularly.
Likewise, if you let your unit tests failing for too long, developers will
look at test failures as “noise” and tend to ignore them.

Moving On

Now that you know the basics of how to use unit tests,
it’s time to start adding unit tests to your project.

See Adding Unit Test Files »

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