test/hs/Test/Ganeti/THH.hs

{-# LANGUAGE TemplateHaskell #-}

{-| Unittests for our template-haskell generated code.

-}

{-

Copyright (C) 2012 Google Inc.
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module Test.Ganeti.THH
  ( testTHH
  ) where

import Test.QuickCheck

import Text.JSON

import Ganeti.THH

import Test.Ganeti.TestHelper
import Test.Ganeti.TestCommon

{-# ANN module "HLint: ignore Use camelCase" #-}

-- * Custom types

-- | Type used to test optional field implementation. Equivalent to
-- @data TestObj = TestObj { tobjA :: Maybe Int, tobjB :: Maybe Int
-- }@.
$(buildObject "TestObj" "tobj"
  [ optionalField $ simpleField "a" [t| Int |]
  , optionalNullSerField $ simpleField "b" [t| Int |]
  ])

-- | Arbitrary instance for 'TestObj'.
$(genArbitrary ''TestObj)

-- | Tests that serialising an (arbitrary) 'TestObj' instance is
-- correct: fully optional fields are represented in the resulting
-- dictionary only when non-null, optional-but-required fields are
-- always represented (with either null or an actual value).
prop_OptFields :: TestObj -> Property
prop_OptFields to =
  let a_member = case tobjA to of
                   Nothing -> []
                   Just x -> [("a", showJSON x)]
      b_member = [("b", case tobjB to of
                          Nothing -> JSNull
                          Just x -> showJSON x)]
  in showJSON to ==? makeObj (a_member ++ b_member)


testSuite "THH"
            [ 'prop_OptFields
            ]