(.require
 [library
  [lux (.except)
   [abstract
    [monad (.only do)]
    [\\specification
     ["$[0]" equivalence]]]
   [data
    ["[0]" text]]
   [math
    ["[0]" random (.only Random)]]
   [test
    ["_" property (.only Test)]]]]
 [\\library
  ["[0]" /]]
 ["$[0]" //
  ["[1][0]" code]])

(def .public random
  (Random Location)
  (all random.and
       (random.alphabetic 10)
       random.nat
       random.nat
       ))

(def .public test
  Test
  (<| (_.covering /._)
      (_.for [.Location])
      (all _.and
           (_.for [/.equivalence]
                  ($equivalence.spec /.equivalence ..random))

           (_.coverage [/.here]
             (not (at /.equivalence = (/.here) (/.here))))
           (do random.monad
             [location ..random
              error (random.alphabetic 10)]
             (_.coverage [/.format /.with]
               (let [located_error (/.with location error)]
                 (and (text.contains? (/.format location)
                                      located_error)
                      (text.contains? error
                                      located_error)))))
           (do random.monad
             [[location _] $//code.random]
             (_.coverage [/.dummy]
               (at /.equivalence = /.dummy location)))
           )))