abstract class AbstractClass
{
    public function concreteMethod()
    {
        return $this->abstractMethod();
    }

    public abstract function abstractMethod();
}

class AbstractClassTest extends PHPUnit_Framework_TestCase
{
    public function testConcreteMethod()
    {
        $stub = $this->getMockForAbstractClass('AbstractClass');
        $stub->expects($this->any())
             ->method('abstractMethod')
             ->will($this->returnValue(TRUE));

        $this->assertTrue($stub->concreteMethod());
    }
}

protected function setUp()
{
    $stub = $this->getMockForAbstractClass('Some_Abstract_Class');
    $this->_object = $stub;
}

sudo pear channel-update pear.phpunit.de
sudo pear upgrade phpunit/PHPUnit

class AbstractClassTest extends PHPUnit_Framework_TestCase
{
    /**
     * @var AbstractClass
     */
    private $testedClass;

    public function setUp()
    {
        $this->testedClass = new class extends AbstractClass {

            protected function abstractMethod()
            {
                // Put a barebones implementation here
            }
        };
    }

    // Put your tests here
}