{-# LANGUAGE OverloadedStrings #-}

module Data.Internal.Wkb.EndianSpec where

import qualified Data.Binary.Get          as BinaryGet
import qualified Data.ByteString.Builder  as ByteStringBuilder
import qualified Data.ByteString.Lazy     as LazyByteString
import qualified GHC.Word                 as Word
import           Test.Hspec               (Spec, describe, it, shouldBe)

import qualified Data.Internal.Wkb.Endian as Endian

spec :: Spec
spec =
  testGetEndian

testGetEndian :: Spec
testGetEndian =
  describe "get endian" $ do
    it "Returns BigEndian for 0" $
      BinaryGet.runGet Endian.endianType (getByteString 0) `shouldBe` Endian.BigEndian
    it "Returns LittleEndian for 1" $
      BinaryGet.runGet Endian.endianType (getByteString 1) `shouldBe` Endian.LittleEndian
    it "Returns fail for other" $
      BinaryGet.runGetOrFail Endian.endianType (getByteString 5) `shouldBe` Left ("", 1, "Invalid EndianType")

getByteString :: Word.Word8 -> LazyByteString.ByteString
getByteString int =
  ByteStringBuilder.toLazyByteString $ ByteStringBuilder.word8 int