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CodeIgniter Unit Tests
This is the preliminary CodeIgniter testing documentation. It will cover both internal as well as external APIs and the reasoning behind their implementation, where appropriate. As with all CodeIgniter documentation, this file should maintain a mostly human readable format to facilitate clean api design. [see http://arrenbrecht.ch/testing/]
First public draft: everything is subject to change
PHP Unit >= 3.5.6
Installation of PEAR and PHPUnit on Ubuntu
Installation on Ubuntu requires a few steps. Depending on your setup you may need to use 'sudo' to install these. Mileage may vary but these steps are a good start.
CodeIgniter bootstraps a request very directly, with very flat class hierarchy. As a result, there is no main CodeIgniter class until the controller is instantiated.
This has forced the core classes to be relatively decoupled, which is a good thing. However, it makes that portion of code relatively hard to test.
Right now that means we'll probably have two core test suites, along with a base for application and package tests. That gives us:
The test/Bootstrap.php file establishes global constants such as BASEPATH, APPPATH, and VIEWPATH, initializing them to point to VFS locations. The test case class employs vfsStream to make a clean virtual filesystem with the necessary paths for every individual test.
Within each test case, VFS directory objects are available to use as arguments to the VFS convenience functions (see below):
Classes being instantiated for testing are read from the actual filesystem by the unit test autoloader, as are mockups created in tests/mocks. If you need access to the real system directory, the SYSTEM_PATH constant always points to it.
Any other resources which need to be read from the path constants must be created or cloned within your test. Functions for doing so are outlined below.
Test cases should extend CI_TestCase. This internally extends PHPUnit\_Framework\_TestCase, so you have access to all of your usual PHPUnit methods.
We need to provide a simple way to modify the globals and the common function output. We also need to be able to mock up the super object as we please.
Current API is not stable. Names and implementations will change.
Set the global config variables in a mock Config object. If key is an array, it will replace the entire config array. They are _not_ merged. If called without any parameters, it will create the mock object but not set any values. The mock Config object also provides rudimentary item() and load() stubs for delivering configured values to classes being tested and handling config load calls, respectively. The load() stub does _not_ actually load any files, it only records the filename provided. Check the config->loaded array to verify calls made.
Set the object to use as the "super object", in a lot of cases this will be a simple stdClass with the attributes you need it to have. If no parameter, will return the instance.
Add an attribute to the super object. This is useful if you set up a simple instance in setUp and then need to add different class mockups to your super object.
Get the _class name_ of a core class, so that you can instantiate it. The variable is returned by reference and is tied to the correct $GLOBALS key. For example:
An alternative way to set one of the core globals.
Creates a new directory in the test VFS. Pass a directory object to be the parent directory or none to create a root-level directory. Returns the new directory object.
Creates a new VFS file. '.php' is automatically appended to the filename if it has no extension. Pass a directory object as the root, and an optional path to recurse and/or create for containing the file. Path may be a string (such as 'models/subdir') or an array (e.g. - array('models', 'subdir') ). Existing directories in the VFS root will be recursed until a new directory is identified - all others in the path will be created, so you can mix-and-match old and new directories. If $file is an array (key = name, value = content), multiple files will be created in the same path.
Clones an existing file from the real filesystem to exist in the same path of the VFS. Path must be relative to the project root (i.e. - starting with 'system' or 'application').
Creates a VFS file path string suitable for use with PHP file operations. Path may be absolute from the VFS root, or relative to a base path. It is often useful to use APPPATH or BASEPATH as the base.
Loads a helper from the real filesystem.
Loads a language file from the real filesystem and returns the $lang array.
Returns the global config array. Internal as you shouldn't need to call this (you're setting it, after all). Used internally to make CI's get_config() work.
Returns an instance of the current test case. We force phpunit to run with backup-globals enabled, so this will always be the instance of the currently running test class.
1. Bootstrap Test
Testing common.php should be pretty simple. Include the file, and test the functions. May require some tweaking so that we can grab the statics from all methods (see is_loaded()). Testing the actual CodeIgniter.php file will most likely be an output test for the default view, with some object checking after the file runs. Needs consideration.
2. System Test
Testing the core system relies on being able to isolate the core components as much as possible. A few of them access other core classes as globals. These should be mocked up and easy to manipulate.
All functions in common.php should be a minimal implementation, or and mapped to a method in the test's parent class to gives us full control of their output.
3. Application Test:
Not sure yet, needs to handle:
4. Package Test:
I don't have a clue how this will work.
Needs to be able to handle packages that are used multiple times within the application (i.e. EE/Pyro modules) as well as packages that are used by multiple applications (library distributions)