Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

As a minor extension, we also keep a semantic version for the UNRELEASED changes.

4.0.1 - 2025-07-14

• Added support for Quickcheck-2.16.

4.0.0 - 2025-03-12

• BREAKING: Removed Realized
  • To migrate uses of Realized with IOSim, index the state type on the choice of RunModel monad and index the relevant types:

    -- Turn:
    data ModelState = State { threadId :: Var ThreadId }
    -- Into:
    data ModelState m = State { threadId :: Var (ThreadId m) }
    

• BREAKING: Moved Error state from StateModel to RunModel and indexed it on both the state and the monad m
• BREAKING: Changed PerformResult from PerformResult (Error state) a to PerformResult state m a
• Added a moreActions property modifier to allow controlling the length of action sequences.

3.4.1 - 2024-03-22

• #70 Expose IsPerformResult typeclass

3.4.0 - 2024-03-01

• Added some lightweight negative-shrinking based on a simple dependency analysis.
• Added the option to return errors from actions by defining type Error state. When this is defined perform has return type m (Either (Error state) (Realized m a)), when it is left as the default the type remains m (Realized m a).
• Changed withGenQ to require a predicate when defining a Quantification. Note: This is technically a breaking change as the interface changed

3.3.1

• Adapt code to not constrain mtl version too much

3.3.0

• Added suppport for GHC 9.6.2 compiler

3.2.0

• Added support for negative testing via validFailingAction and postconditionOnFailure callbacks in StateModel and RunModel.

3.1.1 - 2023-06-26

• Added instances for HasVariables with custom error messages to avoid the issue of missing Generic instances causing difficult to understand type errors.

3.1.0 - 2023-04-10

• BREAKING: Change the type of postcondition to allow you to express property monitoring (e.g. stats or counterexamples) in the postcondition itself - rather than duplicating code for counterexamples in the monitoring function.

3.0.3 - 2023-04-18

• Added hasNoVariablesQ and forAllNonVariableDL functions to help make quantification require less boilerplate in DL properties.

3.0.2 - 2023-02-17

• Added instances of HasVariables for Word types
• Exported definition of HasNoVariables to make it useable with deriving via in downstream packages (whoops!)
• Fixed impossible to use nextVar arguments to forAllUniqueDL

3.0.1 - 2023-02-15

• Remove template haskell dependency

3.0.0 - 2023-02-14

• BREAKING: Add HasVariables class to keep track of symbolic variables and automatically insert precondition checks for well-scopedness of variables.
• BREAKING: Remove some unnecessary and unusead features in dynamic logic, including re-running tests from a counterexample directly.
• Improved printing of counterexamples in DL - they are now printed as code that can be copied more-or-less verbatim to create a runnable counterexample in code.
• Made the variable context explicit to avoid having to keep track of symbolic variables in the model
  • This introduces the ctxAtType and arbitraryVar functions to use in action generators (c.f. the RegistryModel.hs example).

2.0.0 - 2022-10-11

• BREAKING: Add Realized type family to distinguish between the model- and real type of an action
• BREAKING: Introduce RunModel type class to interpret Model-generated sequence of actions against real-world implementation
  • Move perform method from StateModel to this new type-class
  • Also split postcondition and monitoring out from the StateModel to the RunModel type class
• Added Thread registry example based on io-sim concurrency simulation library

1.1.0 - 2022-08-27

• Fix broken links in Hackage-generated documentation and link to other Quviq papers
• Add Show a constraint on monitoring

1.0.0

• Initial publication of quickcheck-dynamic library on Hackage
• Provide base StateModel and DynamicLogic tools to write quickcheck-based models, express properties, and test them