public function test_action_args_with_php4_syntax() {
    $a   = new MockAction();
    $tag = __FUNCTION__;
    $val = new stdClass();

    add_action( $tag, array( &$a, 'action' ) );
    // Call the action with PHP 4 notation for passing object by reference.
    do_action( $tag, array( &$val ) );

    $call_count = $a->get_call_count();
    $argsvar    = $a->get_args();
    $this->assertSame( array( $val ), array_pop( $argsvar ) );
  }