2 files changed, 23 insertions, 1 deletions
diff --git a/test/Spec.hs b/test/Spec.hs
index afe81d028c77..b7004b4f8948 100644
--- a/test/Spec.hs
+++ b/test/Spec.hs
@@ -6,6 +6,7 @@ import qualified Xanthous.Data.EntityMapSpec
 import qualified Xanthous.Data.EntityMap.GraphicsSpec
 import qualified Xanthous.Data.LevelsSpec
 import qualified Xanthous.Data.EntitiesSpec
+import qualified Xanthous.Data.NestedMapSpec
 import qualified Xanthous.DataSpec
 import qualified Xanthous.Entities.RawsSpec
 import qualified Xanthous.GameSpec
@@ -27,8 +28,9 @@ test = testGroup "Xanthous"
   [ Xanthous.Data.EntityCharSpec.test
   , Xanthous.Data.EntityMapSpec.test
   , Xanthous.Data.EntityMap.GraphicsSpec.test
-  , Xanthous.Data.LevelsSpec.test
   , Xanthous.Data.EntitiesSpec.test
+  , Xanthous.Data.LevelsSpec.test
+  , Xanthous.Data.NestedMapSpec.test
   , Xanthous.Entities.RawsSpec.test
   , Xanthous.GameSpec.test
   , Xanthous.Generators.UtilSpec.test
diff --git a/test/Xanthous/Data/NestedMapSpec.hs b/test/Xanthous/Data/NestedMapSpec.hs
new file mode 100644
index 000000000000..acf7a67268f4
--- /dev/null
+++ b/test/Xanthous/Data/NestedMapSpec.hs
@@ -0,0 +1,20 @@
+--------------------------------------------------------------------------------
+module Xanthous.Data.NestedMapSpec (main, test) where
+--------------------------------------------------------------------------------
+import           Test.Prelude
+--------------------------------------------------------------------------------
+import           Test.QuickCheck.Instances.Semigroup ()
+--------------------------------------------------------------------------------
+import qualified Xanthous.Data.NestedMap as NM
+--------------------------------------------------------------------------------
+
+main :: IO ()
+main = defaultMain test
+
+test :: TestTree
+test = testGroup "Xanthous.Data.NestedMap"
+  [ testProperty "insert/lookup" $ \nm ks v ->
+      let nm' = NM.insert ks v nm
+      in counterexample ("inserted: " <> show nm')
+         $ NM.lookup @Map @Int @Int ks nm' === Just (NM.Val v)
+  ]