module Test.LocalTime.TimeZone(testTimeZone) where

import Data.Time
import System.Posix.Env (putEnv)
import Test.Tasty
import Test.Tasty.HUnit

testTimeZone :: TestTree
testTimeZone = testCase "getTimeZone respects TZ env var" $ do
    let epoch = UTCTime (ModifiedJulianDay 57000) 0
    putEnv "TZ=UTC+0"
    zone1 <- getTimeZone epoch
    putEnv "TZ=EST+5"
    zone2 <- getTimeZone epoch
    assertBool "zone not changed" $ zone1 /= zone2