New answers tagged validation
You need to pass the action to check your nonce against, wp_verify_nonce has two parameters. if($_POST && wp_verify_nonce($_REQUEST['test_slider_options_nonce'],'test_slider_action')) echo "TEST";
The default login form is not very developer friendly (and it is more developer friendly now than it used to be). If you browse the source for that page you should be able to convince yourself of that. Your plugin is not going to be able to manipulate the page the way you hope. A theme could create its own login page, but even that doesn't actually ...
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