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diff --git a/users/grfn/xanthous/test/Xanthous/Data/EntitiesSpec.hs b/users/grfn/xanthous/test/Xanthous/Data/EntitiesSpec.hs
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+++ b/users/grfn/xanthous/test/Xanthous/Data/EntitiesSpec.hs
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+--------------------------------------------------------------------------------
+module Xanthous.Data.EntitiesSpec (main, test) where
+--------------------------------------------------------------------------------
+import           Test.Prelude
+--------------------------------------------------------------------------------
+import qualified Data.Aeson as JSON
+--------------------------------------------------------------------------------
+import           Xanthous.Data.Entities
+--------------------------------------------------------------------------------
+
+main :: IO ()
+main = defaultMain test
+
+test :: TestTree
+test = testGroup "Xanthous.Data.Entities"
+  [ testGroup "Collision"
+    [ testProperty "JSON round-trip" $ \(c :: Collision) ->
+        JSON.decode (JSON.encode c) === Just c
+    , testGroup "JSON encoding examples"
+      [ testCase "Stop" $ JSON.encode Stop @?= "\"Stop\""
+      , testCase "Combat" $ JSON.encode Combat @?= "\"Combat\""
+      ]
+    ]
+  , testGroup "EntityAttributes"
+    [ testProperty "JSON round-trip" $ \(ea :: EntityAttributes) ->
+        JSON.decode (JSON.encode ea) === Just ea
+    ]
+  ]