Error: Plugin Phpunit could not be found

[mnyp]

Currently trying to set up Phpunit so I can use it to test my application using cakephp. However after following your instructions and making sure I load the plugin in Config/bootstrap.php it still cannot find the plugin!
I was wondering if you would know what the issue possibly is?

For more clarification this is the error displayed in the console window:

[alfaburro]

cake PhpUnit.phpunit