2 files changed, 56 insertions, 1 deletions
diff --git a/stdlib/test/test/lux/math/random.lux b/stdlib/test/test/lux/math/random.lux
new file mode 100644
index 000000000..ae33ab98f
--- /dev/null
+++ b/stdlib/test/test/lux/math/random.lux
@@ -0,0 +1,54 @@
+(;module:
+  lux
+  (lux [io]
+       (control [monad #+ do Monad])
+       (data [number]
+             (coll [list]
+                   [vector]
+                   [array]
+                   [queue]
+                   [stack]
+                   [set]
+                   [dict]))
+       (math ["r" random]))
+  lux/test)
+
+(context: "Random."
+  #seed +1504643924987
+  [size (|> r;nat (:: @ map (n.% +100)))
+   _list (r;list size r;nat)
+   _vector (r;vector size r;nat)
+   _array (r;array size r;nat)
+   _queue (r;queue size r;nat)
+   _stack (r;stack size r;nat)
+   _set (r;set number;Hash<Nat> size r;nat)
+   _dict (r;dict number;Hash<Nat> size r;nat r;nat)
+   top r;nat
+   filtered (|> r;nat (r;filter (n.<= top)))
+   shuffle-seed r;nat
+   #let [sorted (|> _vector vector;to-list (list;sort n.<))
+         shuffled (|> sorted vector;from-list (r;shuffle shuffle-seed))
+         re-sorted (|> shuffled vector;to-list (list;sort n.<))]]
+  ($_ seq
+      (test "Can produce lists."
+            (n.= size (list;size _list)))
+      (test "Can produce vectors."
+            (n.= size (vector;size _vector)))
+      (test "Can produce arrays."
+            (n.= size (array;size _array)))
+      (test "Can produce queues."
+            (n.= size (queue;size _queue)))
+      (test "Can produce stacks."
+            (n.= size (stack;size _stack)))
+      (test "Can produce sets."
+            (n.= size (set;size _set)))
+      (test "Can produce dicts."
+            (n.= size (dict;size _dict)))
+      (test "Can filter values."
+            (n.<= top filtered))
+      (test "Can shuffle vectors."
+            (let [(^open "v/") (vector;Eq<Vector> number;Eq<Nat>)
+                  sorted (vector;from-list sorted)]
+              (and (not (v/= sorted shuffled))
+                   (v/= sorted (vector;from-list re-sorted)))))
+      ))
diff --git a/stdlib/test/tests.lux b/stdlib/test/tests.lux
index 9b0f8ff11..598c488fd 100644
--- a/stdlib/test/tests.lux
+++ b/stdlib/test/tests.lux
@@ -60,7 +60,8 @@
                          ["_;" lexer]
                          ["_;" regex]))
              ["_;" math]
-             (math (logic ["_;" continuous]
+             (math ["_;" random]
+                   (logic ["_;" continuous]
                           ["_;" fuzzy]))
              (macro ["_;" code]
                     ["_;" syntax]