Returns a PHPUnit_Framework_Constraint_Attribute matcher object.
@since Method available since Release 3.1.0
PHPUnit_Framework_Constraint $constraint:
string $attributeName:
PHPUnit_Framework_Constraint_Attribute
public static function attribute(PHPUnit_Framework_Constraint $constraint, $attributeName) {
return new PHPUnit_Framework_Constraint_Attribute($constraint, $attributeName);
}