5 files changed, 91 insertions, 2 deletions
diff --git a/stdlib/source/test/lux/abstract.lux b/stdlib/source/test/lux/abstract.lux
index b9aa18c9c..ef7cb0774 100644
--- a/stdlib/source/test/lux/abstract.lux
+++ b/stdlib/source/test/lux/abstract.lux
@@ -2,11 +2,14 @@
   [lux #*
    ["_" test (#+ Test)]]
   ["." / #_
+   ["#." apply]
    ["#." codec]
+   ["#." comonad]
    ["#." enum]
    ["#." equivalence]
    ["#." fold]
    ["#." functor]
+   ["#." hash]
    ["#." interval]
    ["#." monad]
    ["#." monoid]
@@ -16,11 +19,14 @@
 (def: #export test
   Test
   ($_ _.and
+      /apply.test
       /codec.test
+      /comonad.test
       /enum.test
       /equivalence.test
       /fold.test
       /functor.test
+      /hash.test
       /interval.test
       /monad.test
       /monoid.test
diff --git a/stdlib/source/test/lux/abstract/apply.lux b/stdlib/source/test/lux/abstract/apply.lux
index 29e3e9d6f..eb8fd4e52 100644
--- a/stdlib/source/test/lux/abstract/apply.lux
+++ b/stdlib/source/test/lux/abstract/apply.lux
@@ -2,8 +2,11 @@
   [lux #*
    [abstract/monad (#+ do)]
    [data
+    ["." maybe]
     [number
-     ["n" nat]]]
+     ["n" nat]]
+    [collection
+     ["." list]]]
    [control
     ["." function]]
    [math
@@ -70,3 +73,22 @@
         (..interchange injection comparison apply)
         (..composition injection comparison apply)
         )))
+
+(def: #export test
+  Test
+  (do random.monad
+    [left random.nat
+     right random.nat]
+    (<| (_.covering /._)
+        ($_ _.and
+            (_.cover [/.compose]
+                     (let [expected (n.+ left right)]
+                       (case (:: (/.compose maybe.monad maybe.apply list.apply) apply
+                                 (#.Some (list (n.+ left)))
+                                 (#.Some (list right)))
+                         (^ (#.Some (list actual)))
+                         (n.= expected actual)
+
+                         _
+                         false)))
+            ))))
diff --git a/stdlib/source/test/lux/abstract/comonad.lux b/stdlib/source/test/lux/abstract/comonad.lux
new file mode 100644
index 000000000..2e63b4eb8
--- /dev/null
+++ b/stdlib/source/test/lux/abstract/comonad.lux
@@ -0,0 +1,27 @@
+(.module:
+  [lux #*
+   [abstract
+    [monad (#+ do)]]
+   [data
+    ["." identity (#+ Identity)]
+    [number
+     ["n" nat]]]
+   [math
+    ["." random]]
+   ["_" test (#+ Test)]]
+  {1
+   ["." /]})
+
+(def: #export test
+  Test
+  (do random.monad
+    [sample random.nat]
+    (<| (_.covering /._)
+        ($_ _.and
+            (_.cover [/.be]
+                     (n.= (inc sample)
+                          (: (Identity Nat)
+                             (/.be identity.comonad
+                               [value (unwrap sample)]
+                               (unwrap (inc value))))))
+            ))))
diff --git a/stdlib/source/test/lux/abstract/functor.lux b/stdlib/source/test/lux/abstract/functor.lux
index fcceca39b..faef439c6 100644
--- a/stdlib/source/test/lux/abstract/functor.lux
+++ b/stdlib/source/test/lux/abstract/functor.lux
@@ -1,7 +1,6 @@
 (.module:
   [lux #*
    ["_" test (#+ Test)]
-   ["%" data/text/format (#+ format)]
    [abstract
     [equivalence (#+ Equivalence)]
     [monad (#+ do)]]
diff --git a/stdlib/source/test/lux/abstract/hash.lux b/stdlib/source/test/lux/abstract/hash.lux
new file mode 100644
index 000000000..f7f82ffe2
--- /dev/null
+++ b/stdlib/source/test/lux/abstract/hash.lux
@@ -0,0 +1,35 @@
+(.module:
+  [lux #*
+   ["_" test (#+ Test)]
+   [abstract
+    [monad (#+ do)]]
+   [data
+    ["." bit ("#@." equivalence)]
+    [number
+     ["n" nat]
+     ["i" int]]]
+   [math
+    ["." random]]]
+  {1
+   ["." /]})
+
+(def: #export test
+  Test
+  (do random.monad
+    [left random.nat
+     right random.int
+     other-left random.nat
+     other-right random.int]
+    (<| (_.covering /._)
+        ($_ _.and
+            (_.cover [/.product]
+                     (and (n.= (:: (/.product n.hash i.hash) hash [left right])
+                               (n.* (:: n.hash hash left)
+                                    (:: i.hash hash right)))
+                          (bit@= (:: (/.product n.hash i.hash) = [left right] [left right])
+                                 (and (:: n.hash = left left)
+                                      (:: i.hash = right right)))
+                          (bit@= (:: (/.product n.hash i.hash) = [left right] [other-left other-right])
+                                 (and (:: n.hash = left other-left)
+                                      (:: i.hash = right other-right)))))
+            ))))