* Tests changing the expression engine.
*/
@Test
public void testSetExpressionEngine()
{
parent.setExpressionEngine(new XPathExpressionEngine());
setUpSubnodeConfig("tables/table[1]");
assertEquals("Wrong field name", NodeStructureHelper.field(0, 1),
config.getString("fields/field[2]/name"));
Set<String> keys = ConfigurationAssert.keysToSet(config);
assertEquals("Wrong number of keys", 2, keys.size());