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+--------------------------------------------------------------------------------
+module Spec where
+--------------------------------------------------------------------------------
+import RIO
+import Test.Hspec
+import Utils
+import Web.JWT (numericDate, decode)
+import GoogleSignIn (EncodedJWT(..), DecodedJWT(..), ValidationResult(..))
+
+import qualified GoogleSignIn
+import qualified Fixtures as F
+import qualified TestUtils
+import qualified Data.Time.Clock.POSIX as POSIX
+--------------------------------------------------------------------------------
+
+main :: IO ()
+main = hspec $ do
+  describe "GoogleSignIn" $
+    describe "validateJWT" $ do
+      let validateJWT' = GoogleSignIn.validateJWT True
+      it "returns a decode error when an incorrectly encoded JWT is used" $ do
+        validateJWT' (GoogleSignIn.EncodedJWT "rubbish") `shouldReturn` CannotDecodeJWT
+
+      it "returns validation error when the aud field doesn't match my client ID" $ do
+        let auds = ["wrong-client-id"]
+                   |> fmap TestUtils.unsafeStringOrURI
+            encodedJWT = F.defaultJWTFields { F.overwriteAuds = auds }
+                         |> F.googleJWT
+        validateJWT' encodedJWT `shouldReturn` NoMatchingClientIDs auds
+
+      it "returns validation success when one of the aud fields matches my client ID" $ do
+        let auds = ["wrong-client-id", "771151720060-buofllhed98fgt0j22locma05e7rpngl.apps.googleusercontent.com"]
+                   |> fmap TestUtils.unsafeStringOrURI
+            encodedJWT@(EncodedJWT jwt) =
+              F.defaultJWTFields { F.overwriteAuds = auds }
+              |> F.googleJWT
+            decodedJWT = jwt |> decode |> TestUtils.unsafeJust |> DecodedJWT
+        validateJWT' encodedJWT `shouldReturn` Valid decodedJWT
+
+      it "returns validation error when one of the iss field doesn't match accounts.google.com or https://accounts.google.com" $ do
+        let erroneousIssuer = TestUtils.unsafeStringOrURI "not-accounts.google.com"
+            encodedJWT = F.defaultJWTFields { F.overwriteIss = erroneousIssuer }
+                         |> F.googleJWT
+        validateJWT' encodedJWT `shouldReturn` WrongIssuer erroneousIssuer
+
+      it "returns validation success when the iss field matches accounts.google.com or https://accounts.google.com" $ do
+        let erroneousIssuer = TestUtils.unsafeStringOrURI "https://accounts.google.com"
+            encodedJWT@(EncodedJWT jwt) =
+              F.defaultJWTFields { F.overwriteIss = erroneousIssuer }
+              |> F.googleJWT
+            decodedJWT = jwt |> decode |> TestUtils.unsafeJust |> DecodedJWT
+        validateJWT' encodedJWT `shouldReturn` Valid decodedJWT
+
+      it "fails validation when the exp field has expired" $ do
+        let mErroneousExp = numericDate 0
+        case mErroneousExp of
+          Nothing -> True `shouldBe` False
+          Just erroneousExp -> do
+            let encodedJWT = F.defaultJWTFields { F.overwriteExp = erroneousExp }
+                             |> F.googleJWT
+            validateJWT' encodedJWT `shouldReturn` StaleExpiry erroneousExp
+
+      it "passes validation when the exp field is current" $ do
+        mFreshExp <- POSIX.getPOSIXTime
+                     |> fmap (\x -> x * 60 * 60 * 24 * 10) -- 10 days later
+                     |> fmap numericDate
+        case mFreshExp of
+          Nothing -> True `shouldBe` False
+          Just freshExp -> do
+            let encodedJWT@(EncodedJWT jwt) =
+                  F.defaultJWTFields { F.overwriteExp = freshExp }
+                  |> F.googleJWT
+                decodedJWT = jwt |> decode |> TestUtils.unsafeJust |> DecodedJWT
+            validateJWT' encodedJWT `shouldReturn` Valid decodedJWT