keuringsdienst (empty) → 0.1.0.2

raw patch · 12 files changed

+1411/−0 lines, 12 filesdep +HTFdep +aesondep +basesetup-changed

Dependencies added: HTF, aeson, base, containers, keuringsdienst, text

Files

• COPYING +595/−0
• ChangeLog.md +22/−0
• ChangeLog.org +8/−0
• README.md +87/−0
• README.org +98/−0
• Setup.hs +2/−0
• keuringsdienst.cabal +132/−0
• src/Keuringsdienst.hs +117/−0
• src/Keuringsdienst/Helpers.hs +147/−0
• test/Keuringsdienst/HelpersSpec.hs +64/−0
• test/KeuringsdienstSpec.hs +129/−0
• test/Spec.hs +10/−0

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@@ -0,0 +1,22 @@++# Table of Contents++1.  [Changelog for \`keuringsdienst\`](#org1c49459)+    1.  [v0.1.0.2](#org8ac1b09)+++<a id="org1c49459"></a>++# Changelog for \`keuringsdienst\`++All notable changes to this project will be documented in this file.++The format is based on Keep a Changelog - <https://keepachangelog.com/en/1.0.0/>, and this project adheres to the Haskell Package Versioning Policy - <https://pvp.haskell.org/>.+++<a id="org8ac1b09"></a>++## v0.1.0.2++-   First stable API release+

@@ -0,0 +1,8 @@+* Changelog for `keuringsdienst`++All notable changes to this project will be documented in this file.++The format is based on Keep a Changelog - https://keepachangelog.com/en/1.0.0/, and this project adheres to the Haskell Package Versioning Policy - https://pvp.haskell.org/.++** v0.1.0.2+- First stable API release

@@ -0,0 +1,87 @@+++# Keuringsdienst (van Waarde)++![img](https://git.sr.ht/~teutonicjoe/honeybadger/blob/master/dist/haskell.png) ![img](https://git.sr.ht/~teutonicjoe/honeybadger/blob/master/dist/gnu-gpl-v3.png)++If you know, you know. Data validation in Haskell that is composable, made easy and clean.++Licensed under the GNU General Public License v3 or later.++Data validation rules that are easy to write and serve as documentation of your data as well. Therefore, data validations **SHOULD** live next to your data models.+++## Context and motivation++There exist many data validation packages, in Haskell and other languages, but so far I have never found something that was flexible but powerful enough for my needs.++I based myself on `Semigroup` and `Monoid` operations, and attempted to make validation rules that are easy to write, read, compose and maintain.++See an example, from my music website WikiMusic.++    validateEntity x =+      (identifier x) |?| isTextOfLength 36+      <> (displayName x) |?| (isNonEmptyText <> isTextSmallerThanOrEqual 120)++Imagine a simple data model (record) for a music artist:++    data Artist = Artist+    { identifier :: Text,+      displayName :: Text,+      createdBy :: Text,+      visibilityStatus :: Int,+      approvedBy :: Maybe Text,+      createdAt :: UTCTime,+      lastEditedAt :: Maybe UTCTime,+      artworks :: Map Text ArtistArtwork,+      comments :: Map Text ArtistComment,+      opinions :: Map Text ArtistOpinion,+      spotifyUrl :: Maybe Text+    }+    deriving (Eq, Show, Generic)+++## Defining validations++Of course for all this to work, you need some imports:++    import Keuringsdienst+    import Keuringsdienst.Helpers++You can define a validation function for `Artist` by composing validation results and rules. Validation results are the result of applying rules to certain data and can be composed with `<>` since they are `Monoid`. Rules can also be composed (`AND`) with `<>` since they are also `Monoid` and can be `OR`'ed with the `*||*` operator, a.k.a `ofDitOfDat`.++    validateArtist :: Artist -> ValidationResult+    validateArtist x =+      (identifier x) |?| isTextOfLength 36+        <> (displayName x) |?| (isNonEmptyText <> isTextSmallerThanOrEqual 120)+        <> (createdBy x) |?| isTextOfLength 36+        <> (visibilityStatus x) |?| isPositiveOrZero+        <> (approvedBy x) |??| isTextOfLength 36+        <> (spotifyUrl x) |??| isNonEmptyText+++## What is a ValidationResult++    type ErrMsg = Text+    +    data Validation err+      = Success+      | Failure err+      deriving (Eq, Show, Generic, FromJSON, ToJSON)+    +    type ValidationResult = Validation [ErrMsg]+++## Optics / Lenses++If you like `Optics` and lenses as I do, you are fully free to use it:++    validateArtist :: Artist -> ValidationResult+    validateArtist x =+      (x ^. #identifier) |?| isTextOfLength 36+        <> (x ^. #displayName) |?| (isNonEmptyText <> isTextSmallerThanOrEqual 120)+        <> (x ^. #createdBy) |?| isTextOfLength 36+        <> (x ^. #visibilityStatus) |?| isPositiveOrZero+        <> (x ^. #approvedBy) |??| isTextOfLength 36+        <> (x ^. #spotifyUrl) |??| isNonEmptyText+

@@ -0,0 +1,98 @@+#+author: Josep Bigorra+#+email: jjbigorra@gmail.com+#+options: toc:nil++* Keuringsdienst (van Waarde)++[[https://git.sr.ht/~teutonicjoe/honeybadger/blob/master/dist/haskell.png]] [[https://git.sr.ht/~teutonicjoe/honeybadger/blob/master/dist/gnu-gpl-v3.png]]++If you know, you know. Data validation in Haskell that is composable, made easy and clean.++Licensed under the GNU General Public License v3 or later.++Data validation rules that are easy to write and serve as documentation of your data as well. Therefore, data validations *SHOULD* live next to your data models.+++** Context and motivation++There exist many data validation packages, in Haskell and other languages, but so far I have never found something that was flexible but powerful enough for my needs.++I based myself on ~Semigroup~ and ~Monoid~ operations, and attempted to make validation rules that are easy to write, read, compose and maintain.++See an example, from my music website WikiMusic.++#+begin_src haskell+  validateEntity x =+    (identifier x) |?| isTextOfLength 36+    <> (displayName x) |?| (isNonEmptyText <> isTextSmallerThanOrEqual 120)+#+end_src++Imagine a simple data model (record) for a music artist:++#+begin_src haskell+  data Artist = Artist+  { identifier :: Text,+    displayName :: Text,+    createdBy :: Text,+    visibilityStatus :: Int,+    approvedBy :: Maybe Text,+    createdAt :: UTCTime,+    lastEditedAt :: Maybe UTCTime,+    artworks :: Map Text ArtistArtwork,+    comments :: Map Text ArtistComment,+    opinions :: Map Text ArtistOpinion,+    spotifyUrl :: Maybe Text+  }+  deriving (Eq, Show, Generic)+#+end_src++** Defining validations+      +Of course for all this to work, you need some imports:+#+begin_src haskell+  import Keuringsdienst+  import Keuringsdienst.Helpers+#+end_src++You can define a validation function for ~Artist~ by composing validation results and rules. Validation results are the result of applying rules to certain data and can be composed with ~<>~ since they are ~Monoid~. Rules can also be composed (~AND~) with ~<>~ since they are also ~Monoid~ and can be ~OR~'ed with the ~*||*~ operator, a.k.a ~ofDitOfDat~.++#+begin_src haskell+  validateArtist :: Artist -> ValidationResult+  validateArtist x =+    (identifier x) |?| isTextOfLength 36+      <> (displayName x) |?| (isNonEmptyText <> isTextSmallerThanOrEqual 120)+      <> (createdBy x) |?| isTextOfLength 36+      <> (visibilityStatus x) |?| isPositiveOrZero+      <> (approvedBy x) |??| isTextOfLength 36+      <> (spotifyUrl x) |??| isNonEmptyText+#+end_src++** What is a ValidationResult++#+begin_src haskell+  type ErrMsg = Text++  data Validation err+    = Success+    | Failure err+    deriving (Eq, Show, Generic, FromJSON, ToJSON)++  type ValidationResult = Validation [ErrMsg]+#+end_src++** Optics / Lenses++If you like ~Optics~ and lenses as I do, you are fully free to use it:++#+begin_src haskell+  validateArtist :: Artist -> ValidationResult+  validateArtist x =+    (x ^. #identifier) |?| isTextOfLength 36+      <> (x ^. #displayName) |?| (isNonEmptyText <> isTextSmallerThanOrEqual 120)+      <> (x ^. #createdBy) |?| isTextOfLength 36+      <> (x ^. #visibilityStatus) |?| isPositiveOrZero+      <> (x ^. #approvedBy) |??| isTextOfLength 36+      <> (x ^. #spotifyUrl) |??| isNonEmptyText+#+end_src++

@@ -0,0 +1,2 @@+import Distribution.Simple+main = defaultMain

@@ -0,0 +1,132 @@+cabal-version: 1.12++-- This file has been generated from package.yaml by hpack version 0.35.2.+--+-- see: https://github.com/sol/hpack++name:           keuringsdienst+version:        0.1.0.2+synopsis:       Data validation in Haskell made easy.+description:    Data validation in Haskell made easy and clean, with user rules that can be combined.+category:       Validation, Data+author:         Josep Bigorra+maintainer:     Josep Bigorra+license:        GPL-3+license-file:   COPYING+build-type:     Simple+extra-source-files:+    README.md+    README.org+    ChangeLog.md+    ChangeLog.org++source-repository head+  type: git+  location: https://git.sr.ht/~teutonicjoe/keuringsdienst++library+  exposed-modules:+      Keuringsdienst+      Keuringsdienst.Helpers+  other-modules:+      Paths_keuringsdienst+  hs-source-dirs:+      src+  default-extensions:+      ImportQualifiedPost+      BangPatterns+      BinaryLiterals+      ConstraintKinds+      DataKinds+      DefaultSignatures+      DeriveDataTypeable+      DeriveFoldable+      DeriveFunctor+      DeriveGeneric+      DeriveTraversable+      DoAndIfThenElse+      EmptyDataDecls+      ExistentialQuantification+      FlexibleContexts+      FlexibleInstances+      FunctionalDependencies+      GADTs+      InstanceSigs+      KindSignatures+      LambdaCase+      MultiParamTypeClasses+      MultiWayIf+      NamedFieldPuns+      OverloadedStrings+      PartialTypeSignatures+      PatternGuards+      PolyKinds+      RankNTypes+      ScopedTypeVariables+      StandaloneDeriving+      TupleSections+      TypeFamilies+      TypeSynonymInstances+      ViewPatterns+  ghc-options: -Wall -Wcompat -Widentities -Wincomplete-record-updates -Wincomplete-uni-patterns -Wmissing-export-lists -Wmissing-home-modules -Wpartial-fields -Wredundant-constraints+  build-depends:+      aeson <=2.2.0.0+    , base >=4.5 && <5+    , containers <=0.6.7+    , text <=2.0.2+  default-language: Haskell2010++test-suite antikythera-test+  type: exitcode-stdio-1.0+  main-is: Spec.hs+  other-modules:+      Keuringsdienst.HelpersSpec+      KeuringsdienstSpec+      Paths_keuringsdienst+  hs-source-dirs:+      test+  default-extensions:+      ImportQualifiedPost+      BangPatterns+      BinaryLiterals+      ConstraintKinds+      DataKinds+      DefaultSignatures+      DeriveDataTypeable+      DeriveFoldable+      DeriveFunctor+      DeriveGeneric+      DeriveTraversable+      DoAndIfThenElse+      EmptyDataDecls+      ExistentialQuantification+      FlexibleContexts+      FlexibleInstances+      FunctionalDependencies+      GADTs+      InstanceSigs+      KindSignatures+      LambdaCase+      MultiParamTypeClasses+      MultiWayIf+      NamedFieldPuns+      OverloadedStrings+      PartialTypeSignatures+      PatternGuards+      PolyKinds+      RankNTypes+      ScopedTypeVariables+      StandaloneDeriving+      TupleSections+      TypeFamilies+      TypeSynonymInstances+      ViewPatterns+  ghc-options: -Wall -Wcompat -Widentities -Wincomplete-record-updates -Wincomplete-uni-patterns -Wmissing-export-lists -Wmissing-home-modules -Wpartial-fields -Wredundant-constraints -threaded -rtsopts -with-rtsopts=-N+  build-depends:+      HTF <=0.15.0.1+    , aeson <=2.2.0.0+    , base+    , containers <=0.6.7+    , keuringsdienst+    , text <=2.0.2+  default-language: Haskell2010

@@ -0,0 +1,117 @@+{-+  Copyright © 2023 Josep Bigorra++  This file is part of Keuringsdienst.+  Keuringsdienst is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation,+    either version 3 of the License, or (at your option) any later version.++  Keuringsdienst is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;+    without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.++  See the GNU General Public License for more details.+  You should have received a copy of the GNU General Public License along with Keuringsdienst.+  If not, see <https://www.gnu.org/licenses/>.+-}+{-# LANGUAGE DataKinds #-}+{-# LANGUAGE DeriveAnyClass #-}+{-# LANGUAGE FlexibleContexts #-}+{-# LANGUAGE FlexibleInstances #-}+{-# LANGUAGE MultiParamTypeClasses #-}+{-# LANGUAGE ScopedTypeVariables #-}+{-# LANGUAGE TypeFamilies #-}+{-# LANGUAGE UndecidableInstances #-}++module Keuringsdienst+  ( (*||*),+    (|??|),+    (|?|),+    ValidationResult,+    ValidationRule (..),+    Validation (..),+    keuren,+    misschienKeuren,+    validate,+    maybeValidate,+    ofDitOfDat,+  )+where++import Data.Aeson hiding (Success)+import Data.Text as T+import GHC.Generics++type ErrMsg = Text++data Validation err+  = Success+  | Failure err+  deriving (Eq, Show, Generic, FromJSON, ToJSON)++type ValidationResult = Validation [ErrMsg]++instance Semigroup ValidationResult where+  (<>) a b = case a of+    Success -> case b of+      Success -> Success+      Failure errorsB -> Failure errorsB+    Failure errorsA -> case b of+      Success -> Failure errorsA+      Failure errorsB -> Failure (errorsA <> errorsB)++instance Monoid ValidationResult where+  mempty = Success++newtype ValidationRule a = ValidationRule+  { performValidation :: a -> ValidationResult+  }++instance Semigroup (ValidationRule x) where+  (<>) a b = do+    ValidationRule+      { performValidation = \value -> performValidation a value <> performValidation b value+      }++instance Monoid (ValidationRule a) where+  mempty = ValidationRule {performValidation = const Success}++-- keuren operator+keuren :: a -> ValidationRule a -> ValidationResult+keuren x rule = performValidation rule x++infixl 8 |?|++-- keuren operator+(|?|) :: a -> ValidationRule a -> ValidationResult+(|?|) = keuren++-- keuren operator+validate :: a -> ValidationRule a -> ValidationResult+validate = keuren++-- misschienKeuren operator+misschienKeuren :: Maybe a -> ValidationRule a -> ValidationResult+misschienKeuren x rule = maybe Success (performValidation rule) x++infixl 8 |??|++-- misschienKeuren operator+(|??|) :: Maybe a -> ValidationRule a -> ValidationResult+(|??|) = misschienKeuren++-- misschienKeuren operator+maybeValidate :: Maybe a -> ValidationRule a -> ValidationResult+maybeValidate = misschienKeuren++-- if one of the validations has a successful result, then the validation is a success+ofDitOfDat :: ValidationRule a -> ValidationRule a -> ValidationRule a+ofDitOfDat rule1 rule2 = ValidationRule $ \actual ->+  case (performValidation rule1 actual, performValidation rule2 actual) of+    (Failure e1, Failure e2) -> Failure (e1 <> e2)+    (Success, _) -> Success+    (_, Success) -> Success++infixl 6 *||*++-- ofDitOfDat operator+(*||*) :: ValidationRule a -> ValidationRule a -> ValidationRule a+(*||*) = ofDitOfDat

@@ -0,0 +1,147 @@+{-+  Copyright © 2023 Josep Bigorra++  This file is part of Keuringsdienst.+  Keuringsdienst is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation,+    either version 3 of the License, or (at your option) any later version.++  Keuringsdienst is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;+    without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.++  See the GNU General Public License for more details.+  You should have received a copy of the GNU General Public License along with Keuringsdienst.+  If not, see <https://www.gnu.org/licenses/>.+-}+{-# LANGUAGE DataKinds #-}+{-# LANGUAGE FlexibleContexts #-}+{-# LANGUAGE FlexibleInstances #-}+{-# LANGUAGE MultiParamTypeClasses #-}+{-# LANGUAGE ScopedTypeVariables #-}+{-# LANGUAGE TypeFamilies #-}+{-# LANGUAGE UndecidableInstances #-}++module Keuringsdienst.Helpers+  ( filterFailedValidations,+    isEqualTo,+    isLesserThan,+    isNegative,+    isNegativeOrZero,+    isNonEmptyText,+    isPositive,+    isPositiveOrZero,+    isTextOfLength,+    isTextSmallerThan,+    isTextSmallerThanOrEqual,+    isNotEqualTo,+  )+where++import Data.Map as Map+import Data.Text as T+import Keuringsdienst as K++isEqualTo :: (Show a, Eq a) => a -> ValidationRule a+isEqualTo value = ValidationRule $ \actual ->+  if actual == value+    then Success+    else+      Failure+        [pack $ "Expected " <> show actual <> " to equal " <> show value]++isNotEqualTo :: (Show a, Eq a) => a -> ValidationRule a+isNotEqualTo value = ValidationRule $ \actual ->+  if actual /= value+    then Success+    else+      Failure+        [pack $ "Expected " <> show actual <> " to not equal " <> show value]++isGreaterThan :: (Show a, Ord a) => a -> ValidationRule a+isGreaterThan ruleValue = ValidationRule $ \actual ->+  if actual > ruleValue+    then Success+    else+      Failure+        [ pack (show actual <> " was expected to be greater than " <> show ruleValue)+        ]++isLesserThan :: (Show a, Ord a) => a -> ValidationRule a+isLesserThan ruleValue = ValidationRule $ \actual ->+  if actual < ruleValue+    then Success+    else+      Failure+        [ pack (show actual <> " was expected to be lesser than " <> show ruleValue)+        ]++isNonEmptyText :: ValidationRule Text+isNonEmptyText = ValidationRule $ \actual ->+  if T.null actual+    then Failure [T.pack "Text was expected to be non-empty"]+    else Success++isTextOfLength :: Int -> ValidationRule Text+isTextOfLength ruleValue = ValidationRule $ \actual -> do+  let actualTextLength = T.length actual+  if actualTextLength /= ruleValue+    then+      Failure+        [ T.pack+            ( "Text was expected to be of size "+                <> show ruleValue+                <> " but was "+                <> show actualTextLength+            )+        ]+    else Success++isTextSmallerThan :: Int -> ValidationRule Text+isTextSmallerThan ruleValue = ValidationRule $ \actual -> do+  let actualTextLength = T.length actual+  if actualTextLength >= ruleValue+    then+      Failure+        [ T.pack+            ( "Text was expected to be smaller than "+                <> show ruleValue+                <> " but was "+                <> show actualTextLength+            )+        ]+    else Success++isTextSmallerThanOrEqual :: Int -> ValidationRule Text+isTextSmallerThanOrEqual ruleValue = ValidationRule $ \actual -> do+  let actualTextLength = T.length actual+  if actualTextLength > ruleValue+    then+      Failure+        [ T.pack+            ( "Text was expected to be smaller than "+                <> show ruleValue+                <> " but was "+                <> show actualTextLength+            )+        ]+    else Success++isNegative :: ValidationRule Int+isNegative = isLesserThan 0++isPositive :: ValidationRule Int+isPositive = isGreaterThan 0++isPositiveOrZero :: ValidationRule Int+isPositiveOrZero = isPositive *||* isEqualTo 0++isNegativeOrZero :: ValidationRule Int+isNegativeOrZero = isNegative *||* isEqualTo 0++filterFailedValidations :: Map Text (Validation err) -> Map Text (Validation err)+filterFailedValidations =+  Map.filter+    ( \x -> do+        case x of+          Failure _ -> True+          Success -> False+    )

@@ -0,0 +1,64 @@+{-+  Copyright © 2023 Josep Bigorra++  This file is part of Keuringsdienst.+  Keuringsdienst is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation,+    either version 3 of the License, or (at your option) any later version.++  Keuringsdienst is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;+    without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.++  See the GNU General Public License for more details.+  You should have received a copy of the GNU General Public License along with Keuringsdienst.+  If not, see <https://www.gnu.org/licenses/>.+-}+{-# OPTIONS_GHC -F -pgmF htfpp #-}++module Keuringsdienst.HelpersSpec+  ( htf_thisModulesTests,+  )+where++import Data.Text as T+import Keuringsdienst as K+import Keuringsdienst.Helpers as KH+import Test.Framework++-- λ test helpers+someText :: Text+someText = "Keuringsdienst van Waarde"++-- λ test cases+-- isEqualTo+test_isEqualToRuleWillSucceedWithText :: IO ()+test_isEqualToRuleWillSucceedWithText =+  assertEqual K.Success systemUnderTest+  where+    systemUnderTest :: ValidationResult+    systemUnderTest = someText |?| isEqualTo someText++test_isEqualToRuleWillFailWithText :: IO ()+test_isEqualToRuleWillFailWithText =+  case systemUnderTest of+    K.Failure _ -> pure ()+    K.Success -> error "Expected rule validation to return a failure"+  where+    systemUnderTest :: ValidationResult+    systemUnderTest = T.take 1 someText |?| isEqualTo someText++-- isNotEqualTo+test_isNotEqualToRuleWillSucceedWithText :: IO ()+test_isNotEqualToRuleWillSucceedWithText =+  assertEqual K.Success systemUnderTest+  where+    systemUnderTest :: ValidationResult+    systemUnderTest = T.take 1 someText |?| isNotEqualTo someText++test_isNotEqualToRuleWillFailWithText :: IO ()+test_isNotEqualToRuleWillFailWithText =+  case systemUnderTest of+    K.Failure _ -> pure ()+    K.Success -> error "Expected rule validation to return a failure"+  where+    systemUnderTest :: ValidationResult+    systemUnderTest = someText |?| isNotEqualTo someText

@@ -0,0 +1,129 @@+{-+  Copyright © 2023 Josep Bigorra++  This file is part of Keuringsdienst.+  Keuringsdienst is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation,+    either version 3 of the License, or (at your option) any later version.++  Keuringsdienst is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;+    without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.++  See the GNU General Public License for more details.+  You should have received a copy of the GNU General Public License along with Keuringsdienst.+  If not, see <https://www.gnu.org/licenses/>.+-}+{-# OPTIONS_GHC -F -pgmF htfpp #-}++module KeuringsdienstSpec+  ( htf_thisModulesTests,+  )+where++import Data.Text+import Keuringsdienst as K+import Test.Framework++-- λ test helpers+someErrorMessage :: Text+someErrorMessage = "You're simply a test! Better than all the rest!"++alwaysSuccessfulValidationRule :: ValidationRule a+alwaysSuccessfulValidationRule = ValidationRule {performValidation = const K.Success}++alwaysFailureValidationRule :: ValidationRule a+alwaysFailureValidationRule = ValidationRule {performValidation = const (K.Failure [someErrorMessage])}++-- λ test cases+test_validationResultsCanBeComposedIfBothSuccess :: IO ()+test_validationResultsCanBeComposedIfBothSuccess =+  assertEqual K.Success systemUnderTest+  where+    systemUnderTest :: ValidationResult+    systemUnderTest = K.Success <> K.Success++test_validationResultsCanBeComposedIfSuccessFailure :: IO ()+test_validationResultsCanBeComposedIfSuccessFailure =+  assertEqual expected systemUnderTest+  where+    expected :: ValidationResult+    expected = K.Failure [someErrorMessage]+    systemUnderTest :: ValidationResult+    systemUnderTest = K.Success <> K.Failure [someErrorMessage]++test_validationResultsCanBeComposedIfFailureSuccess :: IO ()+test_validationResultsCanBeComposedIfFailureSuccess =+  assertEqual expected systemUnderTest+  where+    expected :: ValidationResult+    expected = K.Failure [someErrorMessage]+    systemUnderTest :: ValidationResult+    systemUnderTest = K.Failure [someErrorMessage] <> K.Success++test_keurenOperatorAppliesValidation :: IO ()+test_keurenOperatorAppliesValidation =+  assertEqual K.Success systemUnderTest+  where+    systemUnderTest :: ValidationResult+    systemUnderTest = ("" :: Text) |?| alwaysSuccessfulValidationRule++test_nonInfixKeurenOperatorAppliesValidation :: IO ()+test_nonInfixKeurenOperatorAppliesValidation =+  assertEqual K.Success systemUnderTest+  where+    systemUnderTest :: ValidationResult+    systemUnderTest = keuren ("" :: Text) alwaysSuccessfulValidationRule++test_nonInfixValidateOperatorAppliesValidation :: IO ()+test_nonInfixValidateOperatorAppliesValidation =+  assertEqual K.Success systemUnderTest+  where+    systemUnderTest :: ValidationResult+    systemUnderTest = validate ("" :: Text) alwaysSuccessfulValidationRule++test_misschienKeurenOperatorAppliesValidation :: IO ()+test_misschienKeurenOperatorAppliesValidation =+  assertEqual expected systemUnderTest+  where+    expected :: ValidationResult+    expected = K.Failure [someErrorMessage]+    systemUnderTest :: ValidationResult+    systemUnderTest = (Just "" :: Maybe Text) |??| alwaysFailureValidationRule++test_nonInfixMisschienKeurenOperatorAppliesValidation :: IO ()+test_nonInfixMisschienKeurenOperatorAppliesValidation =+  assertEqual expected systemUnderTest+  where+    expected :: ValidationResult+    expected = K.Failure [someErrorMessage]+    systemUnderTest :: ValidationResult+    systemUnderTest = misschienKeuren (Just "" :: Maybe Text) alwaysFailureValidationRule++test_nonInfixMaybeValidateOperatorAppliesValidation :: IO ()+test_nonInfixMaybeValidateOperatorAppliesValidation =+  assertEqual expected systemUnderTest+  where+    expected :: ValidationResult+    expected = K.Failure [someErrorMessage]+    systemUnderTest :: ValidationResult+    systemUnderTest = maybeValidate (Just "" :: Maybe Text) alwaysFailureValidationRule++test_misschienKeurenOperatorAppliesValidationOnNothing :: IO ()+test_misschienKeurenOperatorAppliesValidationOnNothing =+  assertEqual K.Success systemUnderTest+  where+    systemUnderTest :: ValidationResult+    systemUnderTest = (Nothing :: Maybe Text) |??| alwaysSuccessfulValidationRule++test_nonInfixMisschienKeurenOperatorAppliesValidationOnNothing :: IO ()+test_nonInfixMisschienKeurenOperatorAppliesValidationOnNothing =+  assertEqual K.Success systemUnderTest+  where+    systemUnderTest :: ValidationResult+    systemUnderTest = misschienKeuren (Nothing :: Maybe Text) alwaysSuccessfulValidationRule++test_nonInfixMaybeValidateOperatorAppliesValidationOnNothing :: IO ()+test_nonInfixMaybeValidateOperatorAppliesValidationOnNothing =+  assertEqual K.Success systemUnderTest+  where+    systemUnderTest :: ValidationResult+    systemUnderTest = maybeValidate (Nothing :: Maybe Text) alwaysSuccessfulValidationRule

@@ -0,0 +1,10 @@+{-# OPTIONS_GHC -F -pgmF htfpp #-}++module Main (main) where++import {-@ HTF_TESTS @-} Keuringsdienst.HelpersSpec+import {-@ HTF_TESTS @-} KeuringsdienstSpec+import Test.Framework++main :: IO ()+main = htfMain htf_importedTests