Tests valid and invalid JWTs for the "aud" field

Test that when the JWT contains the client ID for my Google app, the JWT is
valid, and when it doesn't, it's invalid.

website/sandbox/learnpianochords/src/server/Fixtures.hs

@@ -7,25 +7,28 @@ import Web.JWT
 import Utils
 
 import qualified Data.Map as Map
+import qualified GoogleSignIn
+import qualified TestUtils
 --------------------------------------------------------------------------------
 
 -- | These are the JWT fields that I'd like to overwrite in the `googleJWT`
 -- function.
 data JWTFields = JWTFields
   { overwriteSigner :: Signer
-  , overwriteAud :: Maybe StringOrURI
+  , overwriteAuds :: [StringOrURI]
   }
 
 defaultJWTFields :: JWTFields
 defaultJWTFields = JWTFields
   { overwriteSigner = hmacSecret "secret"
-  , overwriteAud = stringOrURI "771151720060-buofllhed98fgt0j22locma05e7rpngl.apps.googleusercontent.com"
+  , overwriteAuds = ["771151720060-buofllhed98fgt0j22locma05e7rpngl.apps.googleusercontent.com"]
+                    |> fmap TestUtils.unsafeStringOrURI
   }
 
-googleJWT :: JWTFields -> Maybe (JWT UnverifiedJWT)
+googleJWT :: JWTFields -> GoogleSignIn.EncodedJWT
 googleJWT JWTFields{..} =
   encodeSigned signer jwtHeader claimSet
-  |> decode
+  |> GoogleSignIn.EncodedJWT
   where
     signer :: Signer
     signer = overwriteSigner
@@ -42,7 +45,7 @@ googleJWT JWTFields{..} =
     claimSet = JWTClaimsSet
       { iss = stringOrURI "accounts.google.com"
       , sub = stringOrURI "114079822315085727057"
-      , aud = overwriteAud |> fmap Left
+      , aud = overwriteAuds |> Right |> Just
       -- TODO: Replace date creation with a human-readable date constructor.
       , Web.JWT.exp = numericDate 1596756453
       , nbf = Nothing