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.