Test.QuickCheck.DynamicLogic.Internal

A DynFormula may depend on the QuickCheck size parameter

Base Dynamic logic formulae language. Formulae are parameterised over the type of state s to which they apply. A DynLogic value cannot be constructed directly, one has to use the various "smart constructors" provided, see the Building formulae section.

Ignore this formula, i.e. backtrack and try something else. forAllScripts ignore (const True) will discard all test cases (equivalent to False ==> True).

True for DL formulae.

Given f must be True given any state.

Given f must be True after some action. f is passed the state resulting from executing the Action.

Given f must be True after some negative action. f is passed the state resulting from executing the Action as a negative action.

Disjunction for DL formulae. Is True if either formula is True. The choice is angelic, ie. it is always made by the "caller". This is mostly important in case a test is Stuck.

First-order quantification of variables. Formula f is True iff. it is True for all possible values of q. The underlying framework will generate values of q and check the formula holds for those values. Quantifiable values are thus values that can be generated and checked and the Test.QuickCheck.DynamicLogic.Quantify module defines basic combinators to build those from building blocks.

Adjust weight for selecting formula. This is mostly useful in relation with (|||) combinator, in order to tweak the priority for generating the next step(s) of the test that matches the formula.

Get the current QuickCheck size parameter.

Prioritise doing this if we are trying to stop generation.

Successfully ends the test.

Ends test with given error message.

Embed QuickCheck's monitoring functions (eg. label, tabulate) in a formula. This is useful to improve the reporting from test execution, esp. in the case of failures.

Formula should hold at any state. In effect this leads to exploring alternatives from a given state s and ensuring formula holds in all those states.

Restricted calls are not generated by AfterAny; they are included in tests explicitly using After in order to check specific properties at controlled times, so they are likely to fail if invoked at other times.

Simplest "execution" function for DynFormula. Turns a given a DynFormula paired with an interpreter function to produce some result from an Actions sequence into a proper Property that can be run by QuickCheck.

Property function suitable for formulae without choice.

Creates a Property from DynFormula with some specialised isomorphism for shrinking purpose.

Validate generated test case.

Test case generation does not always produce a valid test case. In some cases, we did not find a suitable test case matching some DynFormula and we are Stuck, hence we want to discard the test case and start over ; in other cases we found a genuine issue with the formula leading to the impossibility of producing a valid test case.

If failed, return the prefix up to the failure. Also prunes the test in case the model has changed.