How to test for tight psoas muscle?

Could you please elaborate on the steps one could take to identify and test for a tight psoas muscle? Are there specific exercises or stretches that can be performed to assess its tightness, or are there physical indicators one should look for? Additionally, what are the potential consequences of having a tight psoas muscle, and what methods are typically used to alleviate this condition? I'm curious about the best practices for addressing this issue, as it seems to be a common concern among those interested in physical fitness and wellness.