module Test.Calendar.LongWeekYears
    ( longWeekYears
    ) where

import Data.Time.Calendar
import Data.Time.Calendar.WeekDate
import Test.Calendar.LongWeekYearsRef
import Test.Tasty
import Test.Tasty.HUnit

longYear :: Integer -> Bool
longYear year =
    case toWeekDate (fromGregorian year 12 31) of
        (_, 53, _) -> True
        _ -> False

showLongYear :: Integer -> String
showLongYear year =
    unwords
        [ show year ++ ":"
        , (if isLeapYear year
               then "L"
               else " ") ++
          (if longYear year
               then "*"
               else " ")
        ]

longWeekYears :: TestTree
longWeekYears = testCase "longWeekYears" $ assertEqual "" longWeekYearsRef $ unlines $ map showLongYear [1901 .. 2050]