If you really need to test a protected class...

ProtectedMethodTest.php

<?php

class ProtectedMethodTest extends PHPUnit_Framework_TestCase
{
    public function testProtectedMethod()
    {
        $method = self::getMethod(
            'MyClass',
            'getProtectedMethodReturnsTrue'
        );
        $realClass = new MyClass();

        $this->assertTrue($class->invokeArgs($realClass, array($method)));
    }

    protected function getMethod($class, $method)
    {
        $class = new ReflectionClass($class);
        $method = $class->getMethod($method);
        $method->setAccessible(true);

        return $method;
    }
}