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diff --git a/users/wpcarro/website/sandbox/learnpianochords/src/server/Fixtures.hs b/users/wpcarro/website/sandbox/learnpianochords/src/server/Fixtures.hs
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+--------------------------------------------------------------------------------
+module Fixtures where
+--------------------------------------------------------------------------------
+import RIO
+import Web.JWT
+import Utils
+
+import qualified Data.Map as Map
+import qualified GoogleSignIn
+import qualified TestUtils
+import qualified Data.Time.Clock.POSIX as POSIX
+import qualified System.IO.Unsafe as Unsafe
+--------------------------------------------------------------------------------
+
+-- | These are the JWT fields that I'd like to overwrite in the `googleJWT`
+-- function.
+data JWTFields = JWTFields
+  { overwriteSigner :: Signer
+  , overwriteAuds :: [StringOrURI]
+  , overwriteIss :: StringOrURI
+  , overwriteExp :: NumericDate
+  }
+
+defaultJWTFields :: JWTFields
+defaultJWTFields = do
+  let tenDaysFromToday = POSIX.getPOSIXTime
+                         |> Unsafe.unsafePerformIO
+                         |> (\x -> x * 60 * 60 * 25 * 10)
+                         |> numericDate
+                         |> TestUtils.unsafeJust
+  JWTFields
+    { overwriteSigner = hmacSecret "secret"
+    , overwriteAuds = ["771151720060-buofllhed98fgt0j22locma05e7rpngl.apps.googleusercontent.com"]
+                      |> fmap TestUtils.unsafeStringOrURI
+    , overwriteIss = TestUtils.unsafeStringOrURI "accounts.google.com"
+    , overwriteExp = tenDaysFromToday
+    }
+
+googleJWT :: JWTFields -> GoogleSignIn.EncodedJWT
+googleJWT JWTFields{..} =
+  encodeSigned signer jwtHeader claimSet
+  |> GoogleSignIn.EncodedJWT
+  where
+    signer :: Signer
+    signer = overwriteSigner
+
+    jwtHeader :: JOSEHeader
+    jwtHeader = JOSEHeader
+      { typ = Just "JWT"
+      , cty = Nothing
+      , alg = Just RS256
+      , kid = Just "f05415b13acb9590f70df862765c655f5a7a019e"
+      }
+
+    claimSet :: JWTClaimsSet
+    claimSet = JWTClaimsSet
+      { iss = Just overwriteIss
+      , sub = stringOrURI "114079822315085727057"
+      , aud = overwriteAuds |> Right |> Just
+      -- TODO: Replace date creation with a human-readable date constructor.
+      , Web.JWT.exp = Just overwriteExp
+      , nbf = Nothing
+      -- TODO: Replace date creation with a human-readable date constructor.
+      , iat = numericDate 1596752853
+      , unregisteredClaims = ClaimsMap (Map.fromList [])
+      , jti = stringOrURI "0d3d7fa1fe05bedec0a91c88294936b2b4d1b13c"
+      }