Add ToField Day

test/Database/PostgreSQL/Opium/ToFieldSpec.hs

@@ -0,0 +1,30 @@
+{-# LANGUAGE DeriveGeneric #-}
+{-# LANGUAGE OverloadedStrings #-}
+
+module Database.PostgreSQL.Opium.ToFieldSpec (spec) where
+
+import Data.Functor.Identity (Identity (..))
+import Data.Text (Text)
+import Data.Time (fromGregorian)
+import GHC.Generics (Generic)
+import Test.Hspec (SpecWith, describe, it, shouldBe)
+
+import qualified Database.PostgreSQL.Opium as Opium
+
+newtype Result = Result
+  { a :: Bool
+  } deriving (Show, Eq, Generic)
+
+instance Opium.FromRow Result
+
+shouldBeTrue :: Opium.ToParamList p => Opium.Connection -> Text -> p -> IO ()
+shouldBeTrue conn query params = do
+  result <- Opium.fetch query params conn
+  result `shouldBe` Right (Identity (Result True))
+
+spec :: SpecWith Opium.Connection
+spec = do
+  describe "ToField Day" $ do
+    it "Encodes Day" $ \conn -> do
+      shouldBeTrue conn "SELECT $1 = date '1997-09-29' AS a" (Identity $ fromGregorian 1997 9 29)
+      shouldBeTrue conn "SELECT $1 = date '2025-07-28' AS a" (Identity $ fromGregorian 2025 7 28)