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diff --git a/users/grfn/xanthous/test/Xanthous/Entities/CommonSpec.hs b/users/grfn/xanthous/test/Xanthous/Entities/CommonSpec.hs
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+++ b/users/grfn/xanthous/test/Xanthous/Entities/CommonSpec.hs
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+--------------------------------------------------------------------------------
+module Xanthous.Entities.CommonSpec (main, test) where
+--------------------------------------------------------------------------------
+import           Test.Prelude
+import           Data.Vector.Lens (toVectorOf)
+--------------------------------------------------------------------------------
+import           Xanthous.Entities.Common
+--------------------------------------------------------------------------------
+
+main :: IO ()
+main = defaultMain test
+
+test :: TestTree
+test = testGroup "Xanthous.Entities.CommonSpec"
+  [ testGroup "Inventory"
+    [ testProperty "items === itemsWithPosition . _2" $ \inv ->
+        inv ^.. items === inv ^.. itemsWithPosition . _2
+    , testGroup "removeItemFromPosition" $
+      let rewield w inv =
+            let (old, inv') = inv & wielded <<.~ w
+            in inv' & backpack <>~ toVectorOf (wieldedItems . wieldedItem) old
+      in [ (Backpack, \item -> backpack %~ (item ^. wieldedItem <|))
+         , (LeftHand, rewield . inLeftHand)
+         , (RightHand, rewield . inRightHand)
+         , (BothHands, rewield . review doubleHanded)
+         ] <&> \(pos, addItem) ->
+           testProperty (show pos) $ \inv item ->
+             let inv' = addItem item inv
+                 inv'' = removeItemFromPosition pos (item ^. wieldedItem) inv'
+             in inv'' ^.. items === inv ^.. items
+    ]
+  ]