/**
* Returns an instance that contains no references
* @return None
*/
public static function absent()
{
return None::instance();
}
public function testEquals()
{
$absent = None::instance();
$this->assertFalse($absent->equals(new Some('foo')));
$this->assertTrue($absent->equals($absent));
}
public function testEquals()
{
$present = $this->getPresent();
$this->assertTrue($present->equals(new Some($this->value)));
$this->assertFalse($present->equals(new Some('some other value')));
$this->assertFalse($present->equals(None::instance()));
}