2006-07-03HUnit
■ Hunit実行編
Haskell用のテストフレームワークHUnitを試してみました。
-- ファイル名：calculation.hs module Calculation where add :: Int -> Int -> Int add x y = x + y
-- ファイル名：calculation_test.hs import Test.HUnit import Calculation -- Calculationモジュールのaddメソッドのテスト test1 = TestCase (assertEqual "test for add" 5 (add 2 3)) main = runTestTT test1
calculation.hsはテストされる側のモジュールです。またcalculation_.hsはcalculation.hsをテストする側です。
#テストする側ですと書きましたが、正確にはテストする側のmainモジュールと呼べば良いのでしょうか？
calculation.hsとcalculation_test.hsは同じディレクトリに存在します。
D:\Development\PracticeHaskell\work20060704 のディレクトリ 2006/07/04 02:13 <DIR> . 2006/07/04 02:13 <DIR> .. 2006/07/04 01:01 97 calculation.hs 2006/07/04 02:00 240 calculation_test.hs 2 個のファイル 337 バイト 2 個のディレクトリ 7,662,923,776 バイトの空き領域
テストを実行してみます。
D:\Development\PracticeHaskell\work20060704>runghc calculation_test.hs Cases: 1 Tried: 1 Errors: 0 Failures: 0
テストが成功しました。
次にわざと失敗するテストをひとつ追加してテストを実行してみます。
import Test.HUnit import Calculation test1 = TestCase (assertEqual "test for add" 5 (add 2 3)) --test2は失敗するテスト test2 = TestCase (assertEqual "failed test" 4 (add 2 7)) main = do runTestTT test1 runTestTT test2
テストを実行してみます。
D:\Development\PracticeHaskell\work20060704>runghc calculation_test.hs Cases: 1 Tried: 1 Errors: 0 Failures: 0 ### Error: user error (HUnit:failed test expected: 4 but got: 9) Cases: 1 Tried: 1 Errors: 1 Failures: 0
■ HUnitで苦労した点や、気がついた点をメモ
calculation_test.hsをコンパイルした場合は、Calculationモジュールが見つからないというエラーが表示される。モジュールをパスに追加すればよいのは分かるが、モジュールをパスに追加する方法が分からない。
D:\Development\PracticeHaskell\work20060704>ghc calculation_test.hs -o calculati on_test calculation_test.hs:2:0: Failed to load interface for `Calculation': Could not find module `Calculation': use -v to see a list of the files searched for
モジュール名とファイル名を異なるものにすると、テストが失敗する。
テストを実行 D:\Development\PracticeHaskell\work20060704>runghc calculation_test.hs Cases: 1 Tried: 1 Errors: 0 Failures: 0 Calculationモジュールのファイル名をcalculationからcalcへ変更 D:\Development\PracticeHaskell\work20060704>rename calculation.hs calc.hs テストを実行 D:\Development\PracticeHaskell\work20060704>runghc calculation_test.hs Could not find module `Calculation': use -v to see a list of the files searched for (imported from calculation_test.hs)
モジュール名とファイル名は揃えなくてはいけないのでしょうか？
以下assert文の"test for add"という文字列を削除するとテストが失敗する。この説明文は必要なのだろうか？(無いとテストが失敗するから必要なのでしょう)
assertEqual "test for add" 5 (add 2 3)
モジュールの書き方と、それをインポートする方法や考え方が良くわかっていなかった。
HUnitの情報が少ないのでいろいろと困った
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