public function testUnion()
{
$foo = new DeclarationSet();
$foo->addDeclaration(new Declaration('margin-top', '10px'));
$foo->addDeclaration(new Declaration('margin-top', '1px'));
$foo->createDeclaration('margin-bottom', '3px');
$bar = new DeclarationSet();
$bar->addDeclaration(new Declaration('margin-left', '4px'));
$bar->createDeclaration('margin-bottom', '30px');
$bar->createDeclaration('margin-right', '2px');
$baz = $foo->union($bar);
$this->assertEquals('margin-bottom: 3px; margin-left: 4px; margin-right: 2px; margin-top: 1px', strval($baz));
}
/**
* Calculates the set union of $this and an $other DeclarationSet.
* For properties present in both DeclarationSets Declarations from $this
* DeclarationSet take precedence over those in the $other DeclarationSet.
*
* @param DeclarationSet $other
* @return DeclarationSet Union of $this and $other
*/
public function union(DeclarationSet $other)
{
$result = new DeclarationSet($other->declarations);
foreach ($this->declarations as $property => $declaration) {
$result->addDeclaration($declaration);
}
return $result;
}
