Add tests for refererPlid different values

Hey Jorge, I'm sending this PR to you fixing 3 test errors that are currently present on master after LPS-44575 commits. They throw a NPE, so I investigated them and it seems that request is not set on failing test. I've added some test cases to cover the scenarios that were added on initial fix. Could you review this PR and send me feedback whether is good or not, please? cc/ @topolik @cgoncas