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diff --git a/users/aspen/xanthous/test/Xanthous/CommandSpec.hs b/users/aspen/xanthous/test/Xanthous/CommandSpec.hs
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+++ b/users/aspen/xanthous/test/Xanthous/CommandSpec.hs
@@ -0,0 +1,40 @@
+--------------------------------------------------------------------------------
+module Xanthous.CommandSpec (main, test) where
+--------------------------------------------------------------------------------
+import           Test.Prelude
+--------------------------------------------------------------------------------
+import           Xanthous.Command
+--------------------------------------------------------------------------------
+import           Data.Aeson (fromJSON, Value(String))
+import qualified Data.Aeson as A
+import           Graphics.Vty.Input (Key(..), Modifier(..))
+--------------------------------------------------------------------------------
+
+main :: IO ()
+main = defaultMain test
+
+test :: TestTree
+test = testGroup "Xanthous.CommandSpec"
+  [ testGroup "keybindings"
+    [ testCase "all are valid" $ keybindings `deepseq` pure ()
+    , testProperty "all non-move commands are bound" $ \cmd ->
+        let isn'tMove = case cmd of
+                          Move _ -> False
+                          StartAutoMove _ -> False
+                          _ -> True
+        in isn'tMove ==> member cmd commands
+    ]
+  , testGroup "instance FromJSON Keybinding" $
+    [ ("q", Keybinding (KChar 'q') [])
+    , ("<up>", Keybinding KUp [])
+    , ("<left>", Keybinding KLeft [])
+    , ("<right>", Keybinding KRight [])
+    , ("<down>", Keybinding KDown [])
+    , ("S-q", Keybinding (KChar 'q') [MShift])
+    , ("C-S-q", Keybinding (KChar 'q') [MCtrl, MShift])
+    , ("m-<UP>", Keybinding KUp [MMeta])
+    , ("S", Keybinding (KChar 'S') [])
+    ] <&> \(s, kb) ->
+      testCase (fromString $ unpack s <> " -> " <> show kb)
+       $ fromJSON (String s) @?= A.Success kb
+  ]