public function testrootFieldList()
{
/* Given a nested set of FormField, CompositeField, and FieldList objects */
$FieldList = new FieldList($root = new TabSet("Root", $main = new Tab("Main", $a = new TextField("A"), $b = new TextField("B"))));
/* rootFieldList() should always evaluate to the same object: the topmost FieldList */
$this->assertSame($FieldList, $FieldList->rootFieldList());
$this->assertSame($FieldList, $root->rootFieldList());
$this->assertSame($FieldList, $main->rootFieldList());
$this->assertSame($FieldList, $a->rootFieldList());
$this->assertSame($FieldList, $b->rootFieldList());
/* If we push additional fields, they should also have the same rootFieldList() */
$root->push($other = new Tab("Other"));
$other->push($c = new TextField("C"));
$root->push($third = new Tab("Third", $d = new TextField("D")));
$this->assertSame($FieldList, $other->rootFieldList());
$this->assertSame($FieldList, $third->rootFieldList());
$this->assertSame($FieldList, $c->rootFieldList());
$this->assertSame($FieldList, $d->rootFieldList());
}
