Here are a few examples of test scenarios based on various test and eligibility settings. All these scenarios are based on enrolled test takers eligible to take a test.

A Test taker is enrolled in a test and no scheduling parameters are set
Retakes (none), deadline (checked), frequency (not checked)
Retakes limited (retake until passed), deadline (checked), frequency (not checked)
Retakes (none), deadline (not checked), frequency (checked)
Retakes/limited (retake until passed), deadline (not checked), frequency (checked)
Retakes/limited (retake until passed), deadline (checked), frequency (checked)
Retakes/limited (retake until passed), deadline (checked), frequency and Except when test has already been passed. is checked
No retakes, no deadline, frequency and Except when test has already been passed. is checked
No retakes, deadline (checked), frequency and Except when test has already been passed. is checked