public void ParseDeleteVariableCommand()
{
ICommand command = ParseCommand("delete adam;");
Assert.IsNotNull(command);
Assert.IsInstanceOfType(command, typeof(DeleteCommand));
DeleteCommand deleteCommand = (DeleteCommand)command;
Assert.IsInstanceOfType(deleteCommand.Expression, typeof(VariableExpression));
var vexpr = (VariableExpression)deleteCommand.Expression;
Assert.AreEqual("adam", vexpr.Name);
}