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diff --git a/users/aspen/xanthous/test/Xanthous/Data/EntityCharSpec.hs b/users/aspen/xanthous/test/Xanthous/Data/EntityCharSpec.hs
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+++ b/users/aspen/xanthous/test/Xanthous/Data/EntityCharSpec.hs
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+--------------------------------------------------------------------------------
+module Xanthous.Data.EntityCharSpec where
+--------------------------------------------------------------------------------
+import           Test.Prelude
+--------------------------------------------------------------------------------
+import qualified Data.Aeson as JSON
+--------------------------------------------------------------------------------
+import           Xanthous.Data.EntityChar
+--------------------------------------------------------------------------------
+
+main :: IO ()
+main = defaultMain test
+
+test :: TestTree
+test = testGroup "Xanthous.Data.EntityChar"
+  [ testProperty "JSON round-trip" $ \(ec :: EntityChar) ->
+      JSON.decode (JSON.encode ec) === Just ec
+  ]