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QuickCheck.Monadic
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| > quickCheck (property True) | |
| +++ OK, passed 100 tests. | |
| > quickCheck (property False) | |
| *** Failed! Falsifiable (after 1 test): | |
| > quickCheck (unsafePerformIO $ return $ property True) | |
| +++ OK, passed 100 tests. | |
| > quickCheck (unsafePerformIO $ return $ property False) | |
| *** Failed! Falsifiable (after 1 test): | |
| > quickCheck (monadicIO $ run $ return $ property True) | |
| +++ OK, passed 100 tests. | |
| > quickCheck (monadicIO $ run $ return $ property False) | |
| +++ OK, passed 100 tests. |
I was using monadicIO incorrectly. Should be:
> quickCheck (monadicIO $ run (return False) >>= assert)
*** Failed! Assertion failed (after 1 test):
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Why is line 14 passing?