Add aggregate test

mongoDB.cabal

@@ -63,6 +63,11 @@ test-suite test
                  , base
                  , mtl
                  , hspec >= 2
+                 -- Keep supporting the old-locale and time < 1.5 packages for
+                 -- now. It's too difficult to support old versions of GHC and
+                 -- the new version of time.
+                 , old-locale
+                 , time
 
   default-language: Haskell2010
   default-extensions: OverloadedStrings

test/QuerySpec.hs

@@ -121,3 +121,14 @@ spec = around withCleanDatabase $ do
 
       it "raises exception" $
         insertDuplicateWith insertAll_ `shouldThrow` anyException
+
+  describe "aggregate" $ do
+    it "aggregates to normalize and sort documents" $ do
+      db $ insertAll_ "users" [ ["_id" =: "jane", "joined" =: parseDate "2011-03-02", "likes" =: ["golf", "racquetball"]]
+                              , ["_id" =: "joe", "joined" =: parseDate "2012-07-02", "likes" =: ["tennis", "golf", "swimming"]]
+                              , ["_id" =: "jill", "joined" =: parseDate "2013-11-17", "likes" =: ["cricket", "golf"]]
+                              ]
+      result <- db $ aggregate "users" [ ["$project" =: ["name" =: ["$toUpper" =: "$_id"], "_id" =: 0]]
+                                       , ["$sort" =: ["name" =: 1]]
+                                       ]
+      result `shouldBe` [["name" =: "JANE"], ["name" =: "JILL"], ["name" =: "JOE"]]

test/TestImport.hs

@@ -1,7 +1,34 @@
+{-# LANGUAGE CPP #-}
+
 module TestImport (
+  module TestImport,
   module Export
 ) where
 
 import Test.Hspec as Export hiding (Selector)
 import Database.MongoDB as Export
 import Control.Monad.Trans as Export (MonadIO, liftIO) 
+import Data.Maybe (fromJust)
+import Data.Time (ParseTime, UTCTime)
+import qualified Data.Time as Time
+
+-- We support the old version of time because it's easier than trying to use
+-- only the new version and test older GHC versions.
+#if MIN_VERSION_time(1,5,0)
+import Data.Time.Format (defaultTimeLocale, iso8601DateFormat)
+#else
+import System.Locale (defaultTimeLocale, iso8601DateFormat)
+#endif
+
+parseTime :: ParseTime t => String -> String -> t
+#if MIN_VERSION_time(1,5,0)
+parseTime = Time.parseTimeOrError True defaultTimeLocale
+#else
+parseTime fmt = fromJust . Time.parseTime defaultTimeLocale fmt
+#endif
+
+parseDate :: String -> UTCTime
+parseDate = parseTime (iso8601DateFormat Nothing)
+
+parseDateTime :: String -> UTCTime
+parseDateTime = parseTime (iso8601DateFormat (Just "%H:%M:%S"))