Parse headers from an email

test/Test/Data/Email.hs

@@ -0,0 +1,32 @@
+{-# LANGUAGE OverloadedLists #-}
+module Test.Data.Email where
+
+import Test.Tasty
+import Test.Tasty.HUnit
+
+import Data.ByteString.Lazy.Char8 (ByteString)
+
+import qualified Data.Conduit.List as CL
+import qualified Data.Conduit.Binary as CB
+import Conduit
+
+import Data.Email.Header
+import Data.Email
+
+sample :: ByteString
+sample =
+  "Subject: Hello worldddd\n\
+  \From: me@example.com\n\
+  \To: you <you@example.com>\n\
+  \ \n\n \
+  \foo"
+
+parseToList :: ByteString -> IO [Header]
+parseToList _ = runConduit (CB.sourceLbs sample .| parseEmail .| CL.consume)
+
+tests :: TestTree
+tests = testGroup "Data.Email"
+  [ testCase "Can parse a sample email" $ do
+      got <- parseToList sample
+      got @?= [ From "me@example.com", To ["you@example.com"]]
+  ]