/**
* Tests attributes diff tracking
*
* @return void
*/
public function testDiffTracking()
{
$test = new NodeAttribute('test');
$test->add(array('value4', 'value5'));
$test->snapshot();
$test->add(array('value1', 'value2', 'value3'));
$test->remove(array('value4', 'value1', 'value5'));
$test[] = 'value6';
$test[] = 'value4';
$test[] = 'value7';
unset($test[5]);
//value6
$this->assertEquals(array('value2', 'value3', 'value7'), $test->getDiffAdditions(), 'Additions have been tracked');
$this->assertEquals(array('value5'), $test->getDiffDeletions(), 'Deletions have been tracked');
$this->assertEquals(array('value4'), $test->getDiffReplacements(), 'Replacements have been tracked');
$test->snapshot();
$this->assertEquals(array(), $test->getDiffAdditions(), 'Diff tracking has been reset');
$this->assertEquals(array(), $test->getDiffDeletions(), 'Diff tracking has been reset');
$this->assertEquals(array(), $test->getDiffReplacements(), 'Diff tracking has been reset');
}