--
-- Tests for the ‘text-metrics’ package.
--
-- Copyright © 2016 Mark Karpov <markkarpov@openmailbox.org>
--
-- Redistribution and use in source and binary forms, with or without
-- modification, are permitted provided that the following conditions are
-- met:
--
-- * Redistributions of source code must retain the above copyright notice,
-- this list of conditions and the following disclaimer.
--
-- * Redistributions in binary form must reproduce the above copyright
-- notice, this list of conditions and the following disclaimer in the
-- documentation and/or other materials provided with the distribution.
--
-- * Neither the name Mark Karpov nor the names of contributors may be used
-- to endorse or promote products derived from this software without
-- specific prior written permission.
--
-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS “AS IS” AND ANY
-- EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-- WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-- DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
-- DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-- DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-- OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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{-# LANGUAGE CPP #-}
{-# LANGUAGE OverloadedStrings #-}
{-# OPTIONS_GHC -fno-warn-orphans #-}
module Main (main) where
import Data.Ratio
import Data.Text (Text)
import Data.Text.Metrics
import Test.Hspec
import Test.QuickCheck
import qualified Data.Text as T
#if !MIN_VERSION_base(4,8,0)
import Control.Applicative
#endif
instance Arbitrary Text where
arbitrary = T.pack <$> arbitrary
main :: IO ()
main = hspec spec
spec :: Spec
spec = do
describe "levenshtein" $ do
testSwap levenshtein
context "with concrete examples" $ do
testPair levenshtein "kitten" "sitting" 3
testPair levenshtein "cake" "drake" 2
testPair levenshtein "saturday" "sunday" 3
testPair levenshtein "red" "wax" 3
testPair levenshtein "lucky" "lucky" 0
testPair levenshtein "" "" 0
describe "levenshteinNorm" $ do
testSwap levenshteinNorm
testPair levenshteinNorm "kitten" "sitting" (4 % 7)
testPair levenshteinNorm "cake" "drake" (3 % 5)
testPair levenshteinNorm "saturday" "sunday" (5 % 8)
testPair levenshteinNorm "red" "wax" (0 % 1)
testPair levenshteinNorm "lucky" "lucky" (1 % 1)
testPair levenshteinNorm "" "" (1 % 1)
describe "damerauLevenshtein" $ do
testSwap damerauLevenshtein
testPair damerauLevenshtein "veryvery long" "very long" 4
testPair damerauLevenshtein "thing" "think" 1
testPair damerauLevenshtein "nose" "ones" 2
testPair damerauLevenshtein "thing" "sign" 3
testPair damerauLevenshtein "red" "wax" 3
testPair damerauLevenshtein "lucky" "lucky" 0
testPair damerauLevenshtein "" "" 0
describe "damerauLevenshteinNorm" $ do
testSwap damerauLevenshteinNorm
testPair damerauLevenshteinNorm "veryvery long" "very long" (9 % 13)
testPair damerauLevenshteinNorm "thing" "think" (4 % 5)
testPair damerauLevenshteinNorm "nose" "ones" (1 % 2)
testPair damerauLevenshteinNorm "thing" "sign" (2 % 5)
testPair damerauLevenshteinNorm "red" "wax" (0 % 1)
testPair damerauLevenshteinNorm "lucky" "lucky" (1 % 1)
testPair damerauLevenshteinNorm "" "" (1 % 1)
describe "hamming" $ do
testSwap hamming
testPair hamming "karolin" "kathrin" (Just 3)
testPair hamming "karolin" "kerstin" (Just 3)
testPair hamming "1011101" "1001001" (Just 2)
testPair hamming "2173896" "2233796" (Just 3)
testPair hamming "toned" "roses" (Just 3)
testPair hamming "red" "wax" (Just 3)
testPair hamming "lucky" "lucky" (Just 0)
testPair hamming "" "" (Just 0)
testPair hamming "small" "big" Nothing
describe "jaro" $ do
testPair jaro "aa" "a" (5 % 6)
testPair jaro "a" "aa" (5 % 6)
testPair jaro "martha" "marhta" (17 % 18)
testPair jaro "marhta" "martha" (17 % 18)
testPair jaro "dwayne" "duane" (37 % 45)
testPair jaro "duane" "dwayne" (37 % 45)
testPair jaro "dixon" "dicksonx" (23 % 30)
testPair jaro "dicksonx" "dixon" (23 % 30)
testPair jaro "jones" "johnson" (83 % 105)
testPair jaro "johnson" "jones" (83 % 105)
testPair jaro "brain" "brian" (14 % 15)
testPair jaro "brian" "brain" (14 % 15)
testPair jaro "five" "ten" (0 % 1)
testPair jaro "ten" "five" (0 % 1)
testPair jaro "lucky" "lucky" (1 % 1)
testPair jaro "" "" (1 % 1)
describe "jaroWinkler" $ do
testPair jaroWinkler "aa" "a" (17 % 20)
testPair jaroWinkler "a" "aa" (17 % 20)
testPair jaroWinkler "martha" "marhta" (173 % 180)
testPair jaroWinkler "marhta" "martha" (173 % 180)
testPair jaroWinkler "dwayne" "duane" (21 % 25)
testPair jaroWinkler "duane" "dwayne" (21 % 25)
testPair jaroWinkler "dixon" "dicksonx" (61 % 75)
testPair jaroWinkler "dicksonx" "dixon" (61 % 75)
testPair jaroWinkler "jones" "johnson" (437 % 525)
testPair jaroWinkler "johnson" "jones" (437 % 525)
testPair jaroWinkler "brain" "brian" (71 % 75)
testPair jaroWinkler "brian" "brain" (71 % 75)
testPair jaroWinkler "five" "ten" (0 % 1)
testPair jaroWinkler "ten" "five" (0 % 1)
testPair jaroWinkler "lucky" "lucky" (1 % 1)
testPair jaroWinkler "" "" (1 % 1)
-- | Test that given function returns the same results when order of
-- arguments is swapped.
testSwap :: (Eq a, Show a) => (Text -> Text -> a) -> SpecWith ()
testSwap f = context "if we swap the arguments" $
it "produces the same result" $
property $ \a b -> f a b === f b a
-- | Create spec for given metric function applying it to two 'Text' values
-- and comparing the result with expected one.
testPair :: (Eq a, Show a)
=> (Text -> Text -> a) -- ^ Function to test
-> Text -- ^ First input
-> Text -- ^ Second input
-> a -- ^ Expected result
-> SpecWith ()
testPair f a b r = it ("‘" ++ T.unpack a ++ "’ and ‘" ++ T.unpack b ++ "’") $
f a b `shouldBe` r