Testing 如何使测试框架报告QuickCheck的原因'；它失败了吗？

例如，我有这样一个测试代码：

import Data.Decimal
import Data.Ratio
import Data.Word
import Test.HUnit
import Control.Applicative

import Debug.Trace

import Test.QuickCheck
import qualified Test.QuickCheck.Property as P
import Test.Framework as TF (defaultMain, testGroup, Test)
import Test.Framework.Providers.HUnit
import Test.Framework.Providers.QuickCheck2 (testProperty)

isEQ :: (Eq a, Show a) => a -> a -> P.Result
isEQ a b = if a == b
           then P.succeeded
           else P.failed {P.reason = show a ++ "\nis not equal to \n" ++ show b}

-- | "read" is the inverse of "show".
-- 
-- > read (show n) == n
prop_readShow :: Decimal -> P.Result
prop_readShow d =  isEQ (read (show d)) d

tests = [
        testGroup "QuickCheck Data.Decimal" [
                testProperty "readShow"           prop_readShow,
                testProperty "readShowPrecision"  prop_readShowPrecision,
                testProperty "fromIntegerZero"    prop_fromIntegerZero, 

isEQ :: (Eq a, Show a) => a -> a -> P.Result
isEQ a b = if a == b
           then P.succeeded
           else P.failed {P.reason = show a ++ "\nis not equal to \n" ++ show b}

-- | "read" is the inverse of "show".
-- 
-- > read (show n) == n
prop_readShow :: Decimal -> P.Result
prop_readShow d =  isEQ (read (show d)) d

tests = [
        testGroup "QuickCheck Data.Decimal" [
                testProperty "readShow"           prop_readShow,
                testProperty "readShowPrecision"  prop_readShowPrecision,
                testProperty "fromIntegerZero"    prop_fromIntegerZero, 

isEQ :: (Eq a, Show a) => a -> a -> P.Result
isEQ a b = if a == b
           then P.succeeded
           else P.failed {P.reason = show a ++ "\nis not equal to \n" ++ show b}

-- | "read" is the inverse of "show".
-- 
-- > read (show n) == n
prop_readShow :: Decimal -> P.Result
prop_readShow d =  isEQ (read (show d)) d

tests = [
        testGroup "QuickCheck Data.Decimal" [
                testProperty "readShow"           prop_readShow,
                testProperty "readShowPrecision"  prop_readShowPrecision,
                testProperty "fromIntegerZero"    prop_fromIntegerZero, 

TestFrameRowk的报告如下所示

 dist/build/Main/Main -a2000   
QuickCheck Data.Decimal:
  readShow: [Failed]
Arguments exhausted after 0 tests
  readShowPrecision: [Failed]
Arguments exhausted after 0 tests
  fromIntegerZero: [Failed]

---

没有任何失败的理由。外观相同的HSpec测试在报告中打印失败原因，但测试框架测试没有打印失败原因。

这是另一个问题，事实上test-framework-0.8有一个bug，因此测试计数的高值（-a参数）会导致失败

---

您只需要将测试框架的版本降低到0.7。

这里可能存在的问题是，QuickCheck在发现太多不合适的测试用例后放弃了。提高

topt\u maximum\u unjustified\u generated\u tests

将使QuickCheck有更多机会找到可接受的案例，并允许测试完成。

在我看来，QuickCheck无法为测试生成任何可接受的参数。你能把你的

任意

实例发布到

十进制

吗？但奇怪的是，QuickCheck在HSpec下运行时找到了一个反例。你能发布HSpec输出吗？