public function testAllowedChildren()
{
$page = new SiteTree();
$this->assertContains('VirtualPage', $page->allowedChildren(), 'Includes core subclasses by default');
$classA = new SiteTreeTest_ClassA();
$this->assertEquals(array('SiteTreeTest_ClassB'), $classA->allowedChildren(), 'Direct setting of allowed children');
$classB = new SiteTreeTest_ClassB();
$this->assertEquals(array('SiteTreeTest_ClassC', 'SiteTreeTest_ClassCext'), $classB->allowedChildren(), 'Includes subclasses');
$classD = new SiteTreeTest_ClassD();
$this->assertEquals(array('SiteTreeTest_ClassC'), $classD->allowedChildren(), 'Excludes subclasses if class is prefixed by an asterisk');
$classC = new SiteTreeTest_ClassC();
$this->assertEquals(array(), $classC->allowedChildren(), 'Null setting');
}
