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diff --git a/users/aspen/xanthous/test/Xanthous/OrphansSpec.hs b/users/aspen/xanthous/test/Xanthous/OrphansSpec.hs
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+{-# LANGUAGE BlockArguments #-}
+{-# LANGUAGE OverloadedLists #-}
+--------------------------------------------------------------------------------
+module Xanthous.OrphansSpec where
+--------------------------------------------------------------------------------
+import           Test.Prelude
+--------------------------------------------------------------------------------
+import           Text.Mustache
+import           Text.Megaparsec (errorBundlePretty)
+import           Graphics.Vty.Attributes
+import qualified Data.Aeson as JSON
+import           Data.Interval (Interval, (<=..<=), (<=..<), (<..<=))
+import           Data.Aeson ( ToJSON(toJSON), object, Value(Array) )
+import           Data.Aeson.Types (fromJSON)
+import           Data.IntegerInterval (Extended(Finite))
+--------------------------------------------------------------------------------
+import           Xanthous.Orphans
+--------------------------------------------------------------------------------
+
+main :: IO ()
+main = defaultMain test
+
+test :: TestTree
+test = testGroup "Xanthous.Orphans"
+  [ localOption (QuickCheckTests 50)
+  . localOption (QuickCheckMaxSize 10)
+  $ testGroup "Template"
+    [ testProperty "ppTemplate / compileMustacheText " \tpl ->
+        let src = ppTemplate tpl
+            res :: Either String Template
+            res = over _Left errorBundlePretty
+                $ compileMustacheText (templateActual tpl) src
+            expected = templateCache tpl ^?! at (templateActual tpl)
+        in
+          counterexample (unpack src)
+          $ Right expected === do
+            (Template actual cache) <- res
+            maybe (Left "Template not found") Right $ cache ^? at actual
+    , testProperty "JSON round trip" $ \(tpl :: Template) ->
+        counterexample (unpack $ ppTemplate tpl)
+        $ JSON.decode (JSON.encode tpl) === Just tpl
+    ]
+  , testGroup "Attr"
+    [ jsonRoundTrip @Attr ]
+  , testGroup "Extended"
+    [ jsonRoundTrip @(Extended Int) ]
+  , testGroup "Interval"
+    [ testGroup "JSON"
+      [ jsonRoundTrip @(Interval Int)
+      , testCase "parses a single value as a length-1 interval" $
+          getSuccess (fromJSON $ toJSON (1 :: Int))
+          @?= Just (Finite (1 :: Int) <=..<= Finite 1)
+      , testCase "parses a pair of values as a single-ended interval" $
+          getSuccess (fromJSON $ toJSON ([1, 2] :: [Int]))
+          @?= Just (Finite (1 :: Int) <=..< Finite (2 :: Int))
+      , testCase "parses the full included/excluded syntax" $
+          getSuccess (fromJSON $ Array [ object [ "Excluded" JSON..= (1 :: Int) ]
+                                       , object [ "Included" JSON..= (4 :: Int) ]
+                                       ])
+          @?= Just (Finite (1 :: Int) <..<= Finite (4 :: Int))
+      , testCase "parses open/closed as aliases" $
+          getSuccess (fromJSON $ Array [ object [ "Open" JSON..= (1 :: Int) ]
+                                       , object [ "Closed" JSON..= (4 :: Int) ]
+                                       ])
+          @?= Just (Finite (1 :: Int) <..<= Finite (4 :: Int))
+      ]
+    ]
+  ]
+  where
+    getSuccess :: JSON.Result a -> Maybe a
+    getSuccess (JSON.Error _) = Nothing
+    getSuccess (JSON.Success r) = Just r