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CHANGELOG.md

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0.7.0 (2020-3-17)

  • Add Stack resolver lts-15 and drop lts-11;

  • High-level interface to the state machine API (PR #355) -- this captures the patterns described in http://www.well-typed.com/blog/2019/01/qsm-in-depth/ as a proper Haskell abstraction;

  • Experimental support for Markov chain-base command generation and reliability calculations;

  • forAllParallelCommands now gets another argument with type Maybe Int, indicating the minimum number of commands we want a test case to have. Nothing provides old functionality;

  • Fixed a bug in the parallel case for the mock function (PR #348) and other bugs related to references in the parallel case;

  • Add a new field in the StateMachine called cleanup. This function can be used to ensure resources are cleaned between tests. noCleanup can be used to achieve the older functionality;

  • Improved labelling;

  • Generalize parallelism, so that more than two threads can be used (PR #324);

  • Option to print dot visualisation of failed examples;

  • Handle exceptions better and provide better output.

0.6.0 (2019-1-15)

This is a breaking release. See mentioned PRs for how to upgrade your code, and feel free to open an issue if anything isn't clear.

  • Generalise shrinking so that it might depend on the model (PR #263);

  • Drop support for GHC 8.0.* or older, by requiring base >= 4.10 (PR #267). If you need support for older GHC versions, open a ticket;

  • Use Stack resolver lts-13 as default (PR #261);

  • Generalise the GConName type class to make it possible to use it for commands that cannot have Generic1 instances. Also rename the type class to CommandNames (PR #259).

0.5.0 (2019-1-4)

The first and third item in the below list might break things, have a look at the diffs of the PRs on how to fix your code (feel free to open an issue if it isn't clear).

  • Allow the user to explicitly stop the generation of commands (PR #256);
  • Fix shrinking bug (PR #255);
  • Replace MonadBaseControl IO with MonadUnliftIO (PR #252);
  • Check if the pre-condition holds before executing an action (PR #251).

0.4.3 (2018-12-7)

  • Support QuickCheck-2.12.*;
  • Use new compact diffing of records from tree-diff library when displaying counterexamples;
  • Explain mock better in the README;
  • Handle exceptions more gracefully;
  • Show, possibly multiple, counterexample when parallel property fails.

0.4.2 (2018-9-3)

  • Fix bug that made tests fail on systems without docker;
  • Remove some unused dependencies found by the weeder tool.

0.4.1 (2018-8-31)

  • Minor fixes release:

    • Fix broken link and code in README;
    • Disable web server tests when docker isn't available (issue #222).

0.4.0 (2018-8-21)

  • Major rewrite, addressing many issues:

    • The output of sequential runs now shows a diff of how the model changed in each step (related to issue #77);

    • The datatype of actions was renamed to commands and no longer is a GADT (discussed in issue #170, also makes issue #196 obsolete);

    • Commands can now return multiple references (issue #197);

    • Global invariants can now more easily be expressed (issue #200);

    • Counterexamples are now printed when post-conditions fail (issue #172).

0.3.1 (2018-1-15)

  • Remove upper bounds for dependencies, to easier keep up with Stackage nightly.

0.3.0 (2017-12-15)

  • A propositional logic module was added to help provide better counterexamples when pre- and post-conditions don't hold;

  • Generation of parallel programs was improved (base on a comment by Hans Svensson about how Erlang QuickCheck does it);

  • Support for semantics that might fail was added;

  • Pretty printing of counterexamples was improved.

0.2.0

  • Z-inspired definition of relations and associated operations were added to help defining concise and showable models;

  • Template Haskell derivation of shrink and type classes: Show, Constructors, HFunctor, HFoldable, HTraversable;

  • New and more flexible combinators for building sequential and parallel properties replaced the old clunky ones;

  • Circular buffer example was added;

  • Two examples of how to test CRUD web applications were added.

0.1.0

  • The API was simplified, thanks to ideas stolen from Hedgehog.

0.0.0

  • Initial release.