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{-# OPTIONS_GHC -fno-warn-type-defaults #-}
import Data.Foldable (for_)
import Data.List (nub, sort)
import Test.Hspec (Spec, describe, it, shouldBe)
import Test.Hspec.Runner (configFastFail, defaultConfig, hspecWith)
import Palindromes (largestPalindrome, smallestPalindrome)
main :: IO ()
main = hspecWith defaultConfig {configFastFail = True} specs
specs :: Spec
specs = for_ cases test
where
test (desc, minFactor, maxFactor, sPal, sPalFactors, lPal, lPalFactors) =
describe desc $ do
let sortPair (a, b) = if a < b then (a, b) else (b, a)
let normalize = sort . nub . map sortPair
describe "smallesPalindrome" $ do
let (value, factors) = smallestPalindrome minFactor maxFactor
it "value" $ value `shouldBe` sPal
it "factors" $ normalize factors `shouldBe` sPalFactors
describe "largestPalindrome" $ do
let (value, factors) = largestPalindrome minFactor maxFactor
it "value" $ value `shouldBe` lPal
it "factors" $ normalize factors `shouldBe` lPalFactors
cases = [ ("palindromes from single digit factors", 1, 9, 1, [( 1, 1)], 9, [(1, 9), (3, 3)])
, ("palindromes from double digit factors", 10, 99, 121, [( 11, 11)], 9009, [( 91, 99)])
, ("palindromes from triple digit factors", 100, 999, 10201, [( 101, 101)], 906609, [( 913, 993)])
, ("palindromes from four digit factors" , 1000, 9999, 1002001, [( 1001, 1001)], 99000099, [( 9901, 9999)])
, ("palindromes from five digit factors" , 10000, 99999, 100020001, [(10001, 10001)], 9966006699, [(99681, 99979)]) ]
Version data entries
229 entries across 229 versions & 1 rubygems