/lib/Cake/Test/test_app/Plugin/TestPlugin/Model/Datasource/TestSource.php

<?php
App::uses('DataSource', 'Model/Datasource');

class TestSource extends DataSource {

	function describe($model) {
		return compact('model');
	}

	function listSources() {
		return array('test_source');
	}

	function create($model, $fields = array(), $values = array()) {
		return compact('model', 'fields', 'values');
	}

	function read($model, $queryData = array()) {
		return compact('model', 'queryData');
	}

	function update($model, $fields = array(), $values = array()) {
		return compact('model', 'fields', 'values');
	}

	function delete($model, $id) {
		return compact('model', 'id');
	}
}