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forAll :: (Show a, Testable testable) => Gen a -> (a -> testable) -> Property | |
forAll argGen prop = | |
Property $ Gen $ \rand -> -- Create a new property that will | |
let (rand1, rand2) = split rand -- Split the generator in two | |
arg = runGen argGen rand1 -- Use the first generator to produce an arg | |
subProp = property (prop arg) -- Use the `a` to access the sub-property | |
result = runProp subProp rand2 -- Use the second generator to run it | |
in overFailure result $ \failure -> -- Enrich the counter-example with `arg` | |
failure { counterExample = show arg : counterExample failure } |
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