public function testUserNodeFoo($user, $node, $foo) {
$retval = "user: " . (is_object($user) ? $user
->label() : $user);
$retval .= ", node: " . (is_object($node) ? $node
->label() : $node);
$retval .= ", foo: " . (is_object($foo) ? $foo
->label() : $foo);
return $retval;
}