Chapter 17

David is praying that God would test him, and see that he has been true and righteous for his whole life.  His point is that God would protect him from his enemies, because he has remained righteous.  These two verses:

8 Keep me as the apple of your eye; hide me in the shadow of your wings, 9 from the wicked who do me violence, my deadly enemies who surround me. [Psa 17:8-9 ESV]

2023 - Vss 3-5 could have been written by Job also.  Perhaps the difference is that as David fled from Saul, he too could have asked why, since he was so righteous, he was having to suffer so.  But I don't think David ever does that.  He asks for protection, and he asks for how long, but does he really ever say "It's not fair"?