diff --git a/lib/hs/test/BinarySpec.hs b/lib/hs/test/BinarySpec.hs
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+--
+-- Licensed to the Apache Software Foundation (ASF) under one
+-- or more contributor license agreements. See the NOTICE file
+-- distributed with this work for additional information
+-- regarding copyright ownership. The ASF licenses this file
+-- to you under the Apache License, Version 2.0 (the
+-- "License"); you may not use this file except in compliance
+-- with the License. You may obtain a copy of the License at
+--
+--   http://www.apache.org/licenses/LICENSE-2.0
+--
+-- Unless required by applicable law or agreed to in writing,
+-- software distributed under the License is distributed on an
+-- "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+-- KIND, either express or implied. See the License for the
+-- specific language governing permissions and limitations
+-- under the License.
+--
+
+module BinarySpec where
+
+import Test.Hspec
+import Test.Hspec.QuickCheck (prop)
+
+import qualified Data.ByteString.Lazy as LBS
+import qualified Data.ByteString.Lazy.Char8 as C
+
+import Thrift.Types
+import Thrift.Transport
+import Thrift.Transport.Memory
+import Thrift.Protocol
+import Thrift.Protocol.Binary
+
+spec :: Spec
+spec = do
+  describe "BinaryProtocol" $ do
+    describe "double" $ do
+      it "writes in big endian order" $ do
+        let val = 2 ** 53
+        trans <- openMemoryBuffer
+        let proto = BinaryProtocol trans
+        writeVal proto (TDouble val)
+        bin <- tRead trans 8
+        (LBS.unpack bin) `shouldBe`[67, 64, 0, 0, 0, 0, 0, 0]
+
+      it "reads in big endian order" $ do
+        let bin = LBS.pack [67, 64, 0, 0, 0, 0, 0, 0]
+        trans <- openMemoryBuffer
+        let proto = BinaryProtocol trans
+        tWrite trans bin
+        val <- readVal proto T_DOUBLE
+        val `shouldBe` (TDouble $ 2 ** 53)
+
+      prop "round trip" $ \val -> do
+        trans <- openMemoryBuffer
+        let proto = BinaryProtocol trans
+        writeVal proto $ TDouble val
+        val2 <- readVal proto T_DOUBLE
+        val2 `shouldBe` (TDouble val)
+
+    describe "string" $ do
+      it "writes" $ do
+        let val = C.pack "aaa"
+        trans <- openMemoryBuffer
+        let proto = BinaryProtocol trans
+        writeVal proto (TString val)
+        bin <- tRead trans 7
+        (LBS.unpack bin) `shouldBe` [0, 0, 0, 3, 97, 97, 97]