public function testRemoveEmptyOperations()
{
$diff = new Diff(array());
$diff['foo'] = new DiffOpAdd(1);
$diff['bar'] = new Diff(array(new DiffOpAdd(1)), true);
$diff['baz'] = new Diff(array(new DiffOpAdd(1)), false);
$diff['bah'] = new Diff(array(), false);
$diff['spam'] = new Diff(array(), true);
$diff->removeEmptyOperations();
$this->assertTrue($diff->offsetExists('foo'));
$this->assertTrue($diff->offsetExists('bar'));
$this->assertTrue($diff->offsetExists('baz'));
$this->assertFalse($diff->offsetExists('bah'));
$this->assertFalse($diff->offsetExists('spam'));
}