refactor(users/glittershark): Rename to grfn r/2485

Rename my //users directory and all places that refer to glittershark to
grfn, including nix references and documentation.

This may require some extra attention inside of gerrit's database after
it lands to allow me to actually push things.

Change-Id: I4728b7ec2c60024392c1c1fa6e0d4a59b3e266fa
Reviewed-on: https://cl.tvl.fyi/c/depot/+/2933
Tested-by: BuildkiteCI
Reviewed-by: tazjin <mail@tazj.in>
Reviewed-by: lukegb <lukegb@tvl.fyi>
Reviewed-by: glittershark <grfn@gws.fyi>

1 files changed, 84 insertions, 0 deletions

diff --git a/users/grfn/xanthous/test/Xanthous/Generators/UtilSpec.hs b/users/grfn/xanthous/test/Xanthous/Generators/UtilSpec.hs
new file mode 100644
index 0000000000..cdfadc06f5
--- /dev/null
+++ b/users/grfn/xanthous/test/Xanthous/Generators/UtilSpec.hs
@@ -0,0 +1,84 @@
+{-# LANGUAGE PackageImports #-}
+--------------------------------------------------------------------------------
+module Xanthous.Generators.UtilSpec (main, test) where
+--------------------------------------------------------------------------------
+import Test.Prelude
+import System.Random (mkStdGen)
+import Control.Monad.Random (runRandT)
+import Data.Array.ST (STUArray, runSTUArray, thaw)
+import Data.Array.IArray (bounds)
+import Data.Array.MArray (newArray, readArray, writeArray)
+import Data.Array (Array, range, listArray, Ix)
+import Control.Monad.ST (ST, runST)
+import "checkers" Test.QuickCheck.Instances.Array ()
+import Linear.V2
+--------------------------------------------------------------------------------
+import Xanthous.Util
+import Xanthous.Data (width, height)
+import Xanthous.Generators.Util
+--------------------------------------------------------------------------------
+
+main :: IO ()
+main = defaultMain test
+
+--------------------------------------------------------------------------------
+
+newtype GenArray a b = GenArray (Array a b)
+  deriving stock (Show, Eq)
+
+instance (Ix a, Arbitrary a, CoArbitrary a, Arbitrary b)
+       => Arbitrary (GenArray a b) where
+  arbitrary = GenArray <$> do
+    (mkElem :: a -> b) <- arbitrary
+    minDims <- arbitrary
+    maxDims <- arbitrary
+    let bnds = (minDims, maxDims)
+    pure $ listArray bnds $ mkElem <$> range bnds
+
+test :: TestTree
+test = testGroup "Xanthous.Generators.Util"
+  [ testGroup "randInitialize"
+    [ testProperty "returns an array of the correct dimensions"
+      $ \dims seed aliveChance ->
+        let gen = mkStdGen seed
+            res = runSTUArray
+                $ fmap fst
+                $ flip runRandT gen
+                $ randInitialize dims aliveChance
+        in bounds res === (0, V2 (dims ^. width) (dims ^. height))
+    ]
+  , testGroup "numAliveNeighborsM"
+    [ testProperty "maxes out at 8"
+      $ \(GenArray (arr :: Array (V2 Word) Bool)) loc ->
+        let
+          act :: forall s. ST s Word
+          act = do
+            mArr <- thaw @_ @_ @_ @(STUArray s) arr
+            numAliveNeighborsM mArr loc
+          res = runST act
+        in counterexample (show res) $ between 0 8 res
+    ]
+  , testGroup "numAliveNeighbors"
+    [ testProperty "is equivalient to runST . numAliveNeighborsM . thaw" $
+      \(GenArray (arr :: Array (V2 Word) Bool)) loc ->
+        let
+          act :: forall s. ST s Word
+          act = do
+            mArr <- thaw @_ @_ @_ @(STUArray s) arr
+            numAliveNeighborsM mArr loc
+          res = runST act
+        in numAliveNeighbors arr loc === res
+    ]
+  , testGroup "cloneMArray"
+      [ testCase "clones the array" $ runST $
+          let
+            go :: forall s. ST s Assertion
+            go = do
+              arr <- newArray @(STUArray s) (0 :: Int, 5) (1 :: Int)
+              arr' <- cloneMArray @_ @(STUArray s) arr
+              writeArray arr' 0 1234
+              x <- readArray arr 0
+              pure $ x @?= 1
+          in go
+      ]
+  ]