registry-hedgehog-aeson

It's functions all the way down

Presentation

This library is an add-on to registry, providing Hedgehog generators for Aeson values.

In order to generate a Value simply call genValue:

test_generate_value = prop "generate a json value" $ do
  value <- forAll genValue
  collect value
  success

You can modify many aspects of the generation by using the combinators in Data.Registry.Hedgehog.AesonGenerators:

• change the recursive depth of the generation: genValueWith (setDepth 5)
• change the number of elements in an array or an object: genValueWith (setFieldsNb 5)
• use a custom text generator: genValueWith (setGen myTextGenerator)
• change the range used for generating numbers: genValueWith (setRange (linear @Int 0 20))

For example:

test_complex_values = prop "generate complex json values" $ do
  value <- forAll (genValueWith (setDepth 10))
  collect value
  success

Relationship with registry-hedgehog

This library has been designed to only depend on registry. You can add a dependency on registry-hedgehog if you want to create your own registry for data generators and add use the Gen Value provided by this library.