Module happily stores complete garbage instead of validating configuration input at all

Fields such as the "Crowd server" field (ambiguous as to just what constitutes a valid entry here as well -- hostname? IP address? URL?) don't do any basic validation and will accept any random string with no form error upon storing the data. User only finds out if what he entered might be correct upon trying to log into Drupal and then being blocked (except for uid 1) because of misconfiguration, and/or failure of crowd module to even be able to contact Crowd successfully, even when correctly configured.

At a minimum, some basic validation should be done, and better, a test button provided to check whether entered values result in crowd module actually being able to contact Crowd. See all issue #1030238: Module reports WSDL successfully cached upon failure wherein crowd module claims to have successfully cached WSDL when in fact it has not.