The Test Package

This package is a collection of tools that make some of the jobs of unit testing easier.

TestHelper

Joomla\Test\TestHelper is a static helper class that can be used to take some of the pain out of repetitive tasks whilst unit testing with PHPUnit.

Mocking

There are two methods that help with PHPUnit mock objects.

TestHelper::assignMockCallbacks

This helper method provides an easy way to configure mock callbacks in bulk.

use Joomla\Test\TestHelper;

class FooTest extends \PHPUnit_Framework_TestCase
{
	public function testFoo()
	{
		// Create the mock.
		$mockFoo = $this->getMock(
			'Foo',
			// Methods array.
			array(),
			// Constructor arguments.
			array(),
			// Mock class name.
			'',
			// Call original constructor.
			false
		);

		$mockCallbacks = array(
			// 'Method Name' => <callback>
			'method1' => array('\mockFoo', 'method1'),
			'method2' => array($this, 'mockMethod2'),
		);

		TestHelper::assignMockCallbacks($mockFoo, $this, $mockCallbacks);
	}

	public function mockMethod2($value)
	{
		return strtolower($value);
	}
}

TestHelper::assignMockReturns

This helper method provides an easy way to configure mock returns values in bulk.

use Joomla\Test\TestHelper;

class FooTest extends \PHPUnit_Framework_TestCase
{
	public function testFoo()
	{
		// Create the mock.
		$mockFoo = $this->getMock(
			'Foo',
			// Methods array.
			array(),
			// Constructor arguments.
			array(),
			// Mock class name.
			'',
			// Call original constructor.
			false
		);

		$mockReturns = array(
			// 'Method Name' => 'Canned return value'
			'method1' => 'canned result 1',
			'method2' => 'canned result 2',
			'method3' => 'canned result 3',
		);

		TestHelper::assignMockReturns($mockFoo, $this, $mockReturns);
	}
}

Reflection

There are three methods that help with reflection.

TestHelper::getValue

The TestHelper::getValue method allows you to get the value of any protected or private property.

use Joomla\Test\TestHelper;

class FooTest extends \PHPUnit_Framework_TestCase
{
	public function testFoo()
	{
		$instance = new \Foo;

		// Get the value of a protected `bar` property.
		$value = TestHelper::getValue($instance, 'bar');
	}
}

This method should be used sparingly. It is usually more appropriate to use PHPunit's assertAttribute* methods.

TestHelper::setValue

The TestHelper::setValue method allows you to set the value of any protected or private property.

use Joomla\Test\TestHelper;

class FooTest extends \PHPUnit_Framework_TestCase
{
	public function testFoo()
	{
		$instance = new \Foo;

		// Set the value of a protected `bar` property.
		TestHelper::setValue($instance, 'bar', 'New Value');
	}
}

This method is useful for injecting values into an object for the purpose of testing getter methods.

TestHelper::invoke

The TestHelper::invoke method allow you to invoke any protected or private method. After specifying the object and the method name, any remaining arguments are passed to the method being invoked.

use Joomla\Test\TestHelper;

class FooTest extends \PHPUnit_Framework_TestCase
{
	public function testFoo()
	{
		$instance = new \Foo;

		// Invoke the protected `bar` method.
		$value1 = TestHelper::invoke($instance, 'bar');

		// Invoke the protected `bar` method with arguments.
		$value2 = TestHelper::invoke($instance, 'bar', 'arg1', 'arg2');
	}
}

Installation via Composer

Add "joomla/test": "~2.0" to the require block in your composer.json and then run composer install.

{
	"require": {
		"joomla/test": "~2.0"
	}
}

Alternatively, you can simply run the following from the command line:

composer require joomla/test "~2.0"