It complains about "#'STRING-EQUAL is not a function name or lambda expression". That is, it appears that, while the documentation implies the value of :test is evaluated, it is not being evaluated. And, indeed, the following seems to work:
CL-USER> (optima:match '(("a" . 123))
((assoc "A" 123 :test string-equal) t))
T
The following example from the documentation fails when actually run against Optima:
It complains about "#'STRING-EQUAL is not a function name or lambda expression". That is, it appears that, while the documentation implies the value of :test is evaluated, it is not being evaluated. And, indeed, the following seems to work: