Release Notes

Table of Contents

• 1.6.3
• 1.6.2
• 1.6.1
• 1.6.0
• 1.5.x
• 1.4.0
• 1.3.x
• 1.2.x
• 1.1.x
• 1.0.0
• 0.9.x
• 0.8.x

1.6.3

User guide, javadoc and kdoc

New and Enhanced Features

• Upgraded kotlinx to version 1.6.0

• Upgraded to Kotlin 1.6.10.

• @ForAll and @From now support arbitrary suppliers through a supplier attribute.

• Changed Lifecycle Storage API so that stored values can now implement Store.CloseOnReset if they need closing action.

• Added capability to automatically resolve Arbitrary parameters. This is an experimental feature.

• Module time has added the capability to generate ZonedDateTime objects. Many thanks to https://github.com/zinki97 for his continued support with this module!

Breaking Changes

• kotlinx-coroutine-test replaced runBlockingTest with runTest.

• Arbitrary provider methods can no longer have a SubtypeProvider parameter.

• Removed experimental API Store.onClose().

Bug Fixes

• Shrinking now still works when thrown exception has no stacktrace. See https://github.com/jlink/jqwik/issues/283.

• Builders can now use nullable arbitraries. See https://github.com/jlink/jqwik/issues/295.

1.6.2

User guide, javadoc and kdoc

New and Enhanced Features

• Complete Rework of after-failure handling:
  • AfterFailureMode.SAMPLE_FIRST and AfterFailureMode.SAMPLE_ONLY no longer depends on serializability of generated parameters.
  • If random seed is manually changed after a failing test run using Property.seed=<new random seed> the configured after-failure-mode does not apply for the next test run.
  • SAMPLE_FIRST and SAMPLE_ONLY now also work for data-driven properties and exhaustive generation. I recommend now to use SAMPLE_FIRST as default configuration value for most projects.

• Added PropertyDefaults.maxDiscardRatio

• Added two Kotlin convenience functions:
  • fun <T> frequency(vararg frequencies: Pair<Int, T>)
  • fun <T> frequencyOf(vararg frequencies: Pair<Int, Arbitrary<out T>>)
• Maximum size of generated collections and arrays is now generated regularly, if no size distribution is specified

Breaking Changes

• Parameter annotations on array types (e.g. @WithNull String[]) are no longer applied to the component type.

• The jqwik database no longer stores test run data for succeeding tests and properties. This means that the file .jqwik-database in now much smaller in most cases.

Bug Fixes

• Using @WithNull on primitive array types no longer leads to an IllegalArgumentException. See https://github.com/jlink/jqwik/issues/270.

• Generic array types in parameters can now be properly resolved

• After-failure handling now (hopefully) works as expected

1.6.1

User guide, javadoc and kdoc

New and Enhanced Features

• Added TypeArbitrary.enableRecursion() to enable recursive usage of type based generation for types that do not have an applicable default arbitrary.

• @UseType now has an additional attribute enableRecursion, which is set to true by default.

• Added experimental Arbitraries.traverse(..) as a mechanism to traverse a type and all the types it depends on for arbitrary generation.

• TypeArbitrary.use(Executable creator) is now deprecated and will be removed in 1.8.0

• A container class will now inherit @PropertiesDefault annotations from superclass and interfaces.

• A container class will now inherit @AddLifecycleHook annotations from superclass and interfaces.

• A container class will now inherit @Domain annotations from superclass and interfaces.

• A container class will now inherit @Tag annotations from superclass and interfaces.

• Subclasses of DomainContextBase can now implement ArbitraryProvider which is used as a provider for this domain.

• Subclasses of DomainContextBase can now implement ArbitraryConfigurator which is used as a configurator for this domain.

• Multi-value arbitraries (ListArbitrary, SetArbitrary etc.) check minSize and maxSize values at configuration time now.

• Upgrade to Kotlin 1.6.0. Versions 1.5.x should still work with the binary.

• DomainContext implementation classes can now be annotated with @Domain themselves.

• Tags added to containers or property methods through @Tag annotations are now being reported in execution result report as part of the key.

• After failure modes SAMPLE_ONLY and SAMPLE_FIRST now discover changes to parameter configuration with better accuracy, which leads to fewer “impossible” samples being injected into property methods.

• Upgrade to JUnit Platform 1.8.2

Breaking Changes

• Inherited property defaults could change behaviour of existing properties

• Inherited lifecycle hooks could break existing properties

• Inherited domain contexts could break existing properties

• @UseType will by default allow recursively resolve by type

Bug Fixes

• Arbitraries.defaultFor(..) did not apply configurators, but does now.

• Kotlin provider methods can now have internal modifier

1.6.0

User guide, javadoc and kdoc

New and Enhanced Features

• Added new module jqwik-kotlin for improved Kotlin support.

• Introduced new lifecycle hook InvokePropertyMethodHook in order to support some Kotlin specialties.

• Introduced new lifecycle hook ProvidePropertyInstanceHook in order to allow Kotlin singleton objects as test containers.

• Promoted APIs from EXPERIMENTAL to MAINTAINED:
  • net.jqwik.api.Arbitrary.ignoreException(..)
  • net.jqwik.api.Property.whenFixedSeed
  • net.jqwik.api.RandomDistribution and its usages in numerical arbitraries
  • net.jqwik.api.arbitraries.ArbitraryDecorator
  • net.jqwik.api.constraints.NotBlank
  • net.jqwik.api.domains.DomainContextBase
  • net.jqwik.api.statistics.StatisticsReport

• Upgraded to JUnit Platform 1.8.1

• Added experimental JqwikSession API to use arbitraries outside jqwik’s lifecycle.

• Added Functions.FunctionWrapper.returning() as replacement for deprecated returns().

• Added explicit module information for all modules. See https://github.com/jlink/jqwik/issues/243. Thank you https://github.com/sormuras for the support!

Breaking Changes

• Removed AbstractDomainContextBase which had been deprecated in 1.5.2

• @WithNull now has a default probability of 0.05 instead of 0.1

• Configuration through a jqwik.properties file is no longer supported. Please use JUnit Platform configuration instead.

• If a property methods returns false or Boolean.FALSE it will now be considered to have failed. All other return values - including null - are regarded as success. Before this version the method’s return type had to be boolean or Boolean for the return value to matter.

Bug Fixes

• Fixed memory leak when calling Arbitrary.sample() in jqwik scope. See https://github.com/jlink/jqwik/issues/236.

• Sometimes Kotlin method names have a postfix. They can now be resolved and have normal display names.

• Arbitrary.withoutEdgeCases() sometimes did not work in combination with filter, map and flatMap.

• When an arbitrary fails to generate values, the property seed will now be reported.

1.5.x

1.5.6

User guide and javadoc

New and Enhanced Features

• Upgraded to JUnit platform 1.8.0

• Improved performance of large collection generation. See https://github.com/jlink/jqwik/pull/227.

Breaking Changes

• Parameters for StringArbitrary.ofMinLength() and StringArbitrary.ofMaxLength() are validated. See https://github.com/jlink/jqwik/issues/221.

Bug Fixes

• Added reporting format for type char[].

• @StatisticsReport(onFailureOnly = true) now also works when failure is a statistics check failure.

1.5.5

User guide and javadoc

New and Enhanced Features

• You can now add footnotes to failure reports

• Added StatisticsReport.onFailureOnly() to suppress statistics reporting for properties that do not fail.

• Shrinking across several for-all parameters has been improved.

• The Web module now supports web domain name generation.

• The Time module now supports the generation of java.time.OffsetDateTime instances.

Breaking Changes

• Properties with single try (aka examples) with at least one @ForAll parameter will now produce a test report even if they succeed. See https://github.com/jlink/jqwik/issues/217.

Bug Fixes

• Fixed edge cases performance problem. See https://github.com/jlink/jqwik/issues/214

1.5.4

User guide and javadoc

New and Enhanced Features

• Added default method DomainContext.initialize(PropertyLifecycleContext) which can be overridden if domain context implementations need access to the property context.

• Added StringArbitrary.repeatChars(double repeatProbability)

• Added Arbitrary.optional(double presenceProbability)

• Improved shrinking performance of combinator-based arbitraries

• Added net.jqwik.api.Builders as replacement for the now deprecated net.jqwik.api.Combinators.withBuilder(..) API. Here’s the relevant section in the user guide.

• Progress on generation of DateTimes: Objects of type java.time.Instant can now be generated by default.

• FloatArbitrary and DoubleArbitrary can now generate special values on demand.

Breaking Changes

• Generated strings will no longer intentionally generate duplicate characters by default. You now have to tell it to do so.

• Methods Combinators.withBuilder(builderSupplier) and Combinators.withBuilder(arbitrary) are now deprecated.

Bug Fixes

• Addressed performance issues raised in https://github.com/jlink/jqwik/issues/206

• Fixed some type resolution and type usage bug found through https://github.com/mihxil/math.

1.5.3

User guide and javadoc

New and Enhanced Features

• You can now influence the random distribution of the size of generated multi-value containers (sets, lists, arrays, streams, iterators and maps).

• You can now influence the random distribution of the size of generated strings.

• All container-based arbitraries (e.g. List, Sets, Strings) now generate containers without duplicated elements with a higher probability even when they have many elements.

• String arbitraries now generate duplicate chars and series of chars with a higher probability.

• Added CharacterArbitrary.numeric() and CharacterArbitrary.alpha().

Breaking Changes

• ActionSequenceArbitrary no longer extends SizableArbitrary.

• ActionSequenceArbitrary.ofMinSize() and ActionSequenceArbitrary.ofMaxSize() is now deprecated.

• CharacterArbitrary.digit() is now deprecated.

Bug Fixes

• Module name now correctly set for testing, web and time modules. See https://github.com/jlink/jqwik/issues/201.

• No longer throwing ConcurrentModificationException when using sample() within another generator. This happened in Java >= 11 only. See https://github.com/jlink/jqwik/issues/205

1.5.2

User guide and javadoc

New and Enhanced Features

• Added new base class DomainContextBase, which changes the way how you typically provide domain contexts.

  That’s the reason why AbstractDomainContextBase is now deprecated.

• Provider Methods annotated with @Provide now support implicit flat mapping.

• More progress on generation of DateTimes

• Upgrade to JUnit Platform 1.7.2

Breaking Changes

• Removed leapYears(boolean withLeapyear) from all date generating arbitraries.

• Changed Arbitrary<T> Arbitraries.oneOf(List<T> choices) to Arbitrary<T> Arbitraries.oneOf(Collection<? extends T> choices)

Bug Fixes

• Fixed bug in edge case generation: https://github.com/jlink/jqwik/issues/180

• Fixed bug when running inner tests of an extended test container: https://github.com/jlink/jqwik/issues/179

• Fixed bug in Tuple.toString(): https://github.com/jlink/jqwik/issues/187

1.5.1

User guide and javadoc

New and Enhanced Features

• Implemented @StatisticsReport.label as suggested in https://github.com/jlink/jqwik/issues/146.

• Time module
  • Generation of Times
  • Generation of DateTimes got its first rudimentary support.
• Added StringArbitrary.excludeChars(char ... toExclude). See https://github.com/jlink/jqwik/issues/167.

Breaking Changes

• Trying to add a numerical edge case that is outside the arbitrary’s allowed range will now throw an IllegalArgumentException.

Bug Fixes

• Fixed memory leakage introduced in 1.5.0.

• Shrinking of flat mapped values would sometimes never end.

1.5.0

User guide and javadoc

New and Enhanced Features

• Added constraint annotation @NotBlank for String parameters

• Generated email addresses get a few more edge cases

• Shrinking of long Strings (length > 100) is faster now

Breaking Changes

• Removed Arbitrary.unique() which had been deprecated in 1.4.0

• Removed annotation @Unique which had been deprecated in 1.4.0

• Removed Arbitraries.constant(..) which had been deprecated in 1.3.2

Bug Fixes

• Fixed degraded generation performance introduced in version 1.4.0.

• Arbitrary.withoutEdgeCases() did not really get rid of all edge case generation. Now it does.

• Some arbitrary types, e.g. Arbitraries.lazyOf() could not be used in sampling. Now all should work.

• Bounded shrinking could previously result in an OutsideJqwikException.

1.4.0

Unless you don’t have the time for migrating from Arbitrary.unique() to the new uniqueness approach but still need some of the newly added features, you should directly upgrade to version 1.5.0.

User guide and javadoc

New and Enhanced Features

• Upgrade to JUnit Platform 1.7.1

• Using @Property(edgeCases = NONE) will now also suppress the generation of edge cases in embedded arbitraries.

• You now have the capability to configure an arbitrary’s edge case generation.

• There is a new annotation attribute @Property.whenSeedFixed and a new configuration parameter jqwik.seeds.whenfixed to warn or even fail when a property has been given a fixed random seed. See this issued for more details. Many thanks to osi for this contribution.

• jqwik’s approach to specify uniqueness of generated objects has been completely revamped:

  • Arbitrary.unique() and the annotation @Unique are now deprecated and will be removed in version 1.5.
  • Uniqueness constraints are now handled by the elements’ container.
  • The new annotation to require uniqueness is called @UniqueElements and applied to the container’s type.

• Arbitraries modified through Arbitrary.unique(), which is deprecated anyway, no longer generate edge cases. This is actually a bug fix since the generated edge were not considered for uniqueness.

• There’s a new jqwik module jqwik-time which simplifies the generation of dates (and times in a future release). Many thanks to zinki97 for this contribution.

• There’s a new jqwik module jqwik-web which is currently home of email addresses generation.

• Configuration parameters are now loaded via JUnit’s Configuration Parameters mechanism. Parameters specified in jqwik.properties continue to work, but are considered deprecated. Log messages will be emitted for any used properties with their new name. Some parameter names have also changed. Many thanks to osi for this contribution.

• Using internal Kotlin methods as properties will now produce the correct name as seen in the Kotlin source code.

• The User Guide has been restructured.

• There will now be a warning log entry when a property with more than 1 try has no ‘@ForAll’ parameters.

• Promoted APIs from EXPERIMENTAL to MAINTAINED

  • Mostly everything in package net.jqwik.api.lifecycle
  • Method Arbitrary.dontShrink()
  • Method Combinators.CombinableBuilder.inSetter(..)
  • Class PropertyDefaults
  • Class Reporter
  • Class SampleReportingFormat
  • Method Tuple.of()
  • Method Tuple.empty()
  • Method BigDecimalArbitrary.shrinkTowards(..)
  • Method BigIntegerArbitrary.shrinkTowards(..)
  • Method ByteArbitrary.shrinkTowards(..)
  • Method DoubleArbitrary.shrinkTowards(..)
  • Method FloatArbitrary.shrinkTowards(..)
  • Method IntegerArbitrary.shrinkTowards(..)
  • Method LongArbitrary.shrinkTowards(..)
  • Method ShortArbitrary.shrinkTowards(..)
  • Method SetArbitrary.mapEach(..)
  • Method SetArbitrary.flatMapEach(..)
  • Method ListArbitrary.mapEach(..)
  • Method ListArbitrary.flatMapEach(..)
  • Method ActionSequence.withInvariant(..)
  • Method Statistics.coverage(..)
  • Method StatisticsCollector.coverage(..)
  • Class StatisticsCoverage
  • Class StatisticsEntry

Breaking Changes

• Arbitraries.emails() has been moved to net.jqwik.web.api.Web.emails() in new Web module.

• @net.jqwik.api.constraints.Email annotation has been moved to @net.jqwik.web.api.Email in new Web module.

• Parameters annotated with @Email will by default only generate “standard” email addresses.

• Removed deprecated APIs
  • Arbitrary.samples(..)
  • Interface FalsificationResult
  • SampleReportingFormat.reportJavaBean(..)
  • Shrinkable.shrink(Falsifier<T> falsifier)
  • Interface ShrinkingSequence
  • CharacterArbitary.with(Arbitrary<Character> characterArbitrary)
  • StringArbitary.withChars(Arbitrary<Character> characterArbitrary)

• Unconstrained wildcards are no longer handled in a special way but just like unconstrained type variables.

• Arbitrary.array(..) now returns ArrayArbitrary instead of StreamableArbitrary

Bug Fixes

• Fixed bug that could lead to strange edge case generation behaviour when Arbitrary.edgeCases(edgeCasesConfig) was used.

1.3.x

1.3.10

User guide and javadoc

New and Enhanced Features

• Introduced JavaBeanReportingFormat for simpler and configurable reporting of Java beans.

Breaking Changes

• SampleReportingFormat.reportJavaBean(..) has been deprecated. Will be removed in version 1.4.0.

Bug Fixes

• Arbitraries.lazy() did not allow exhaustive generation but does now.

• SampleReportingFormat.reportJavaBean(..) can now handle methods named is or get.

• SampleReportingFormat.reportJavaBean(..) can now handle properties that return Optional<T>.

1.3.9

User guide and javadoc

New and Enhanced Features

• Generating email addresses has now configuration options.

• Generated email addresses now have fewer edge cases.

• Added constraint annotation @Email for generating valid email addresses.

• Experimental support for changing an arbitrary’s edge cases.

• Constraint annotation @StringLength now works for any arbitrary that generates a String.

• Range annotations (@Byte|Short|Int|Long|Float|Double|BigRange) do work now when applied to any arbitrary that generates the appropriate numeric type.

Breaking Changes

• Email arbitrary no longer generates domain hosts without top level domain

Bug Fixes

• Reporting of null values in failed properties no longer fails with NPE.

• Sampling arbitraries with null values no longer fails.

1.3.8

User guide and javadoc

New and Enhanced Features

• You can now generate valid email addresses.

• The header of the label column in histograms and number range histograms can now be changed.

Breaking Changes

• The distribution of char groups when generating Characters or Strings is now weighted by the number of chars in each group so that each possible char has the same probability of being generated - except for edge cases.

• StringArbitrary.withChars(Arbitrary<Character>) was deprecated

• CharacterArbitrary.with(Arbitrary<Character>) was deprecated

Bug Fixes

No known bugs.

1.3.7

User guide and javadoc

New and Enhanced Features

• Added two edge cases for generation of integral numbers.

• Reporting of parameters that changed during execution of property is now better at detecting real changes.

Breaking Changes

• Examples with a failing assumption - i.e. throwing a TestAbortedException - will now be reported as being skipped. See https://github.com/jlink/jqwik/issues/122 for motivation and reasoning.

Bug Fixes

• Using some arbitraries with Arbitrary.sample() outside of a jqwik context no longer worked. Now it does again.

• The default character generator was erroneously considered to produce unique characters. Resulted in a strange to analyze bug when generating functions

1.3.6

User guide and javadoc

New and Enhanced Features

• Shrinking behaviour of arbitraries created with Combinators.withBuilder(..) is now much better, especially much faster.

• Upgrade to JUnit Platform 1.7.0

Breaking Changes

• A maximum of 1000 (instead of 10000) edge cases is generated per arbitrary.

• Arbitraries that allow nullables through Arbitrary.injectNull() or annotation @WithNull will now shrink their values to null if possible.

Bug Fixes

• With a lot of edge cases sometimes only edge cases were generated. Now the minimum ratio is 1 edge case in 3 generating steps.

• Warning about combinatorial explosion of edge cases generation is now logged only once.

• Edge cases for oneOf(..) and frequencyOf(..) generators are now correctly being shrunk.

1.3.5

User guide and javadoc

New and Enhanced Features

• Added Tuple.of() and Tuple.empty() to create an empty tuple.

• The time out for bounded shrinking can now be changed in jqwik.properties

• Sample reporting will now report changes to parameters during property execution

• Added some convenience to use POJOs as builders:

  • BuilderCombinator.build(): Return arbitrary of builder itself
  • CombinableBuilder.inSetter(..): Set a builder’s property and go on using it

• Added SampleReportingFormat.reportJavaBean(Object bean)

Breaking Changes

• Shrinking is no longer bound by number of shrinking attempts, but by time with a 10 seconds default. The reason is that counting shrinking attempts in a consistent manner was difficult, and shrinking could take very very long despite being in BOUNDED mode.

Bug Fixes

• edge cases generation will be stopped when 10000 edge cases have been found. See https://github.com/jlink/jqwik/issues/113

1.3.4

User guide and javadoc

New and Enhanced Features

• Arbitraries.lazyOf(Supplier<Arbitrary<T>> ...) is now the method of choice for recursive value generation. It has much better shrinking behaviour than the more generic lazy() combined with oneOf(). Consult the user guide for an example.

• Added PropertyLifecycleContext.attributes(), which allows to query, set and change a property method’s attributes like number of tries and seed within a AroundPropertyHook lifecycle hook.

• Added @PropertyDefaults annotation which allows to set the defaults of all property methods in a container.

Breaking Changes

• No known breaking changes

Bug Fixes

• Made loading of services thread-safe to allow use of jqwik generators in parallel JUnit runs: https://github.com/jlink/jqwik/pull/117. Thank you, https://github.com/Danny02!

1.3.3

User guide and javadoc

New and Enhanced Features

• Shrinking has been re-implemented from scratch. Should be more predictable and shrink to smaller samples in most cases.

• Shrinking now has stronger equivalence requirements for falsification:
  • Same type of assertion error or other exception
  • Assertion error or exception thrown from the same code location

• Shrinking @AlphaChars will now shrink to uppercase letters (if possible) since their Unicode codepoint is smaller.

• Negative numbers are shrunk to their positive counterpart if possible

• Changes in property result reporting:
  • Shrunk samples have now header line “Shrunk Sample ( steps)"
  • If no shrinking took place samples have header line “Sample”
  • Original samples now also report the original error
  • Action sequences in stateful properties got `their own reporting format

• `Arbitraries.frequencyOf() now takes covariant arbitrary types

• Made loading of services thread-safe to allow use of jqwik generators in parallel JUnit runs: https://github.com/jlink/jqwik/pull/117. Thank you, https://github.com/Danny02!

• Added PropertyLifecycleContext.attributes(), which allows to query, set and change a property method’s attributes like number of tries and seed within a AroundPropertyHook lifecycle hook.

Breaking Changes

• Exceeding shrinking bound is now logged as warning instead of being reported through JUnit platform reporting

• Deprecated interface net.jqwik.api.ShrinkingSequence. Throw all your implementations away!

• Deprecated class net.jqwik.api.FalsificationResult. No longer used anywhere.

• Deprecated method Shrinkable.shrink(Falsifier<T> falsifier). It’s no longer used anywhere.

Bug Fixes

• Reporting an exhausted property had been broken since 1.2.4 and nobody noticed. Works again.

1.3.2

User guide and javadoc

New and Enhanced Features

• Added Arbitrary.dontShrink()

• Added SetArbitrary.mapEach()

• Added SetArbitrary.flatMapEach()

• Added ListArbitrary.mapEach()

• Added ListArbitrary.flatMapEach()

• Added Arbitraries.just(aConstant) and deprecated Arbitraries.constant(aConstant). Most other PBT libraries seem to use just for this functionality.

• Added programmatic access to JUnit 5 platform reporting

• Added Tuple.Tuple5<T,T,T,T,T> Arbitrary.tuple5()

Breaking Changes

• Introduced StreamableArbitrary hierarchy:
  • Arbitrary.set() now has return type net.jqwik.api.arbitraries.SetArbitrary
  • Arbitrary.list() now has return type net.jqwik.api.arbitraries.ListArbitrary
  • Arbitrary.stream() now has return type net.jqwik.api.arbitraries.StreamArbitrary
  • Arbitrary.iterator() now has return type net.jqwik.api.arbitraries.IteratorArbitrary

• Arbitraries.maps(...) now has return type net.jqwik.api.arbitraries.MapArbitrary

• net.jqwik.api.lifecycle.Reporter moved to net.jqwik.api.Reporter

Bug Fixes

• Reporting samples with circular dependencies does no longer throw an exception

• Reporting test failure due to exception without message no longer leads to ignored test

• Reporting shrunk samples now report the actual sample and not a freshly generated one

1.3.1

User guide and javadoc

New and Enhanced Features

• Reporting of falsified, shrunk and generated samples has been completely reworked. See this issue for more details.

• Added Arbitrary.ignoreException(exceptionType) which allows to ignore exceptions during value generation.

Breaking Changes

• Arbitraries.of(List<T>) replaced with Arbitraries.of(Collection<T>)

• Arbitraries.ofSuppliers(List<Supplier<T>>) replaced with Arbitraries.of(Collection<Supplier<T>>)

Bug Fixes

No open bugs had been reported.

1.3.0

User guide and javadoc

New and Enhanced Features

• Added user-guide documentation for Lifecycle Hooks

• Added new statistics report formats: Histogram and NumberRangeHistogram

• Improved shrinking of dependent parameters.

• Added Arbitraries.ofSuppliers(..) to choose among a set of mutable objects.

• You can now influence the distribution of random number generation: All numeric arbitraries now support withDistribution(RandomDistribution) to choose between RandomDistribution.biased() (default), RandomDistribution.uniform() and RandomDistribution.gaussian(borderSigma).

• Default number generation has now a much higher bias towards numbers that are closer to the shrinking target of a number range.

• Using a faster implementation of java.util.Random under the hood

• Massively improved and enhanced generation of edge cases

• Edge Cases Mode is now being reported per property

• Added StringArbitrary.withChars(Arbitrary<Character> characterArbitrary)

• Added CharacterArbitrary.with(Arbitrary<Character> characterArbitrary)

• Promoted APIs from EXPERIMENTAL to MAINTAINED

  • Arbitraries.nothing()
  • Arbitrary.collect(Predicate<List<T>> until)
  • Arbitrary.sample()
  • Arbitrary.sampleStream()
  • Arbitrary.injectDuplicates(double duplicateProbability)
  • Arbitrary.tuple1()
  • Arbitrary.tuple2()
  • Arbitrary.tuple3()
  • Arbitrary.tuple4()
  • Annotation net.jqwik.api.From
  • Class net.jqwik.api.Functions
  • Class net.jqwik.api.arbitraries.FunctionArbitrary

Breaking Changes

• Decimal Generation: min and max values are now rejected if they have more decimal places than the generator’s scale allows.

• Decimal Shrinking: Values without decimal places are no longer preferred while shrinking.

• Removed deprecated APIs
  • Arbitrary.withSamples(T... samples)
  • RandomGenerator.withSamples(T... samples)
  • TryLifecycleContext.propertyContext()
  • net.jqwik.api.Statistics: Replaced by net.jqwik.api.statistics.Statistics

• Set most public methods of RandomGenerator to API status INTERNAL

• Set Arbitrary.exhaustive() to API status INTERNAL

• Set ExhaustiveGenerator and all its methods to API status INTERNAL

• The evaluation order of SkipExecutionHook hooks can no longer be influenced.

Bug Fixes

• An OutOfMemoryError will go through to the top. Fix for bug report from jqwik-spring.

• Arbitraries.of(listOfValues) would break when list does not allow null values.

• Generated functions now handle default methods correctly

1.2.x

1.2.7

User guide and javadoc

New and Enhanced Features

• BigDecimalArbitrary now allows specifying excluded min and max values:
  • BigDecimalArbitrary.between(BigDecimal min, boolean minIncluded, BigDecimal max, boolean maxIncluded)
  • BigDecimalArbitrary.lessThan(BigDecimal max)
  • BigDecimalArbitrary.greaterThan(BigDecimal min)

• Annotation @BigRange has two new optional attributes minIncluded and maxIncluded

• DoubleArbitrary now allows specifying excluded min and max values:
  • DoubleArbitrary.between(double min, boolean minIncluded, double max, boolean maxIncluded)
  • DoubleArbitrary.lessThan(double max)
  • DoubleArbitrary.greaterThan(double min)

• Annotation @DoubleRange has two new optional attributes minIncluded and maxIncluded

• FloatArbitrary now allows specifying excluded min and max values:
  • FloatArbitrary.between(float min, boolean minIncluded, float max, boolean maxIncluded)
  • FloatArbitrary.lessThan(float max)
  • FloatArbitrary.greaterThan(float min)

• Annotation @DoubleRange has two new optional attributes minIncluded and maxIncluded

• Warning about JUnit annotations only shows up when test container class has jqwik property or example methods.

• Upgrade to JUnit Platform 1.6.2

Breaking Changes

• Minor changes to yet undocumented Lifecycle Hooks API

1.2.6

User guide and javadoc

Breaking Changes

• More changes to Lifecycle Hooks API in order to support a jqwik Spring extension

1.2.5

User guide and javadoc

New and Enhanced Features

• Added @BeforeExample as an alias of @BeforeProperty

• Added @AfterExample as an alias of @AfterProperty

• Lifecycle methods annotated with @BeforeTry, @AfterTry, @BeforeProperty, @AfterProperty, @BeforeContainer and @AfterContainer can now have parameters that will be resolved using registered ResolveParameterHook instances.

• Added ActionSequence.withInvariant(String label, Invariant<M> invariant);.

• Added ActionSequence.peek(Consumer<M> modelPeeker).

• Arbitraries.sequences(Arbitrary<? extends Action<M>> actionArbitrary) does now accept covariant subtypes and still returns type Arbitrary<Action<M>>.

• Reporting text on failed statistics coverage check improved.

• Upgrade to JUnit Platform 1.6.1

Breaking Changes

• Some fundamental changes to Lifecycle Hooks API in order to support a jqwik Spring extension

Bug Fixes

• Labelled statistics reports should now reliably being reported in order of first usage.

1.2.4

User guide and javadoc

New and Enhanced Features

• Annotated lifecycle methods have been implemented:
  • @BeforeContainer
  • @AfterContainer
  • @BeforeProperty
  • @AfterProperty
  • @BeforeTry
  • @AfterTry

• @StatisticsReport can now also be used on container classes

• Statistical coverage checking can now be done in a fluent API style

• Improved shrinking of parameters that require duplicate values for falsifying a property

• Upgrade to JUnit Platform 1.6.0

Breaking Changes

• Removed Statistics.coverageOf(). It’s now Statistics.label(..).coverage(..)

• Falsifier no longer extends Predicate<T>

• Many breaking changes in Lifecycle API; but this API had not been published or documented anyway.

Bug Fixes

No open bugs had been reported.

1.2.3

User guide and javadoc

New and Enhanced Features

• The new big feature of this release is coverage checking.

• Statistics reporting can now be switched off. Alternatively you can plug in your own reporting format.

• Added Arbitrary.injectDuplicates(duplicateProbability) to enable the high probability generation of duplicate values

• Added Arbitrary.tuple1(), Arbitrary.tuple2(), Arbitrary.tuple3(), Arbitrary.tuple4() to generate tuples of same base type

• Character \u0000 is being generated as default edge case in String and Character arbitraries - if it lies within the allowed character range.

Breaking Changes

• Statistics.collect(..) and StatisticsCollector.collect(..) can no longer be called with no values. There must be at least one - but it can be null.

• Statistics.collect(..) and StatisticsCollector.collect(..) must always be called with same number of parameters.

• Deprecated net.jqwik.api.Statistics. Use net.jqwik.api.statistics.Statistics instead.

• The standard property report is now the last thing to be reported, i.e. after statistics reports.

• Default priority in AbstractDomainContextBase is now 0 (previously 1), i.e. they no longer supersede built-in jqwik arbitrary providers but mix in.

Bug Fixes

No open bugs had been reported.

1.2.2

User guide and javadoc

New and Enhanced Features

• When configuration parameter database is set to empty, test run recording is now completely disabled.

• Exhaustive generation of single decimals and floats

• Added Arbitrary.sample() and Arbitrary.sampleStream() for enabling the use of generators outside of properties

• Arbitraries.oneOf(Arbitrary<? extends T>... arbitraries) does now accept covariant subtypes and still returns type Arbitrary<T>.

Breaking Changes

• Deprecated Arbitrary.withSamples(T... samples)

Bug Fixes

• Statistics formatting bug
• Exhaustive generation bug
• Using Arbitraries.forType() outside property bug

1.2.1

User guide and javadoc

New and Enhanced Features

• New configuration parameter defaultGeneration for jqwik.properties file
• Added CharacterArbitrary.with(CharSequence allowedChars)
• Added StringArbitrary.withChars(CharSequence allowedChars)
• Arbitraries of List, Set, Stream und arrays are now of type StreamableArray
• Introduced StreamableArray.reduce()
• HashMap can now be generated by default

Breaking Changes

• Arbitrary.exhaustive() must no longer be overridden in implementors of Arbitrary. Override Arbitrary.exhaustive(long maxNumberOfGeneratedSamples) instead.

• TypeUsage.getTypeArguments(): In case of type variables or wildcard types this method will now return the upper bound’s type arguments if there is a single upper bound and no lower bound. This enables correct generation of variables like T extends Map<Integer, String>.

Bug Fixes

• @ForAll annotation could not be replaced by self-made annotation. Now it can.

• Annotations in type parameters of bounds of type variables are now correctly recognized.

• Annotations in type parameters of bounds of wildcards are now correctly recognized.

1.2.0

User guide and javadoc

New and Enhanced Features

• Introduced Labeled Statistics
• Added Arbitraries.entries()
• Added default generation for Map.Entry instances
• Enhanced statistics reporting by absolute count
• jqwik can now generate instances of functions and other functional types
• Provider methods do now accept two optional parameters
• New @From annotation to provide arbitraries for embedded type parameters

Breaking Changes

• Removed CharacterArbitrary.between(min, max) which had been deprecated in 1.1.3

API Promotions

• Promoted from API.Status.EXPERIMENTAL to API.Status.MAINTAINED:

  • Arbitraries.forType(Class<T> targetType) and interface TypeArbitrary
  • Annotation @UseType and enum UseTypeMode
  • Arbitrary.fixGenSize(int genSize)
  • Combinators.withBuilder(Supplier<B> builderSupplier) and Combinators.withBuilder(Arbitrary<B> builderArbitrary)
  • Annotation @Domain and interface DomainContext

Dependency Upgrades and Bug Fixes

• Upgrade to JUnit platform 1.5.1
• Upgrade to Gradle 5.5.1
• Default character generation now excludes codepoints 0xd800 through 0xdfff
• Fixed set generation bug https://github.com/jlink/jqwik/issues/65
• Fixed bug in Unshrinkable.equals. Many thanks to mhyeon-lee for that pull request!
• List and array generation from unique arbitraries now have a default max size that makes sense

1.1.x

1.1.6

User guide and javadoc

• Removed dependencies to internal classes in JUnit platform
• Added Arbitraries.maps()
• Added default generation for Map instances
• @Domain annotation can now also refer to inner class of test container’s base class. Many thanks to larsrh for that pull request!

1.1.5

User guide and javadoc

• Added shrinkTowards(value) to all decimal number arbitraries: FloatArbitrary, DoubleArbitrary, BigDecimalArbitrary
• Exceptions during test class instance creation are now reported as failures
• Removed caching of engine descriptor in JqwikTestEngine

1.1.4

User guide and javadoc

• Upgrade to junit-platform 1.4.2
• Added Arbitrary.collect(Predicate<List<T>> until) in order to collect values in a list
• Added shrinkTowards(value) to all integral number arbitraries: ByteArbitrary, ShortArbitrary, IntegerArbitrary, LongArbitrary, BigIntegerArbitrary in order to change the shrinking target
• Upgrade Gradle to 5.4.2
• Improved shrinking of collections

1.1.3

User guide and javadoc

• Whitespace characters for generation of Strings and chars are now platform and JDK version dependent. See this Github issue.
• Missing @ForAll annotation will now fail test - instead of skipping it. See this Github issue.
• Added CharacterArbitrary.with(char ... allowedChars)
• Added CharacterArbitrary.range(char min, char max)
• Deprecated CharacterArbitrary.between(char min, char max)

1.1.2

User guide and javadoc

• Added Arbitrary.forEachValue(Consumer action)
• Fixed Kotlin compatibility issue
• Fixed decimal generation bug
• Update to JUnit Platform 5.4.1

1.1.1

User guide and javadoc

• Added Combinators.withBuilder to enable a different way for combining arbitraries.

• You can configure if you want to report only failures.

• The reporting format for run properties has changed.

• Added @Domain.priority() to enable prioritisation of domain context classes.

• Added Arbitraries.create.

• Fixed problem with double and float conversion in range constraints. My thanks go to blairdye for that!

• Annotation @Provide can now be placed on a “super method” i.e. a method from a superclass or super interface that is overridden.

• Annotation @Provide can now be placed on another annotation for composite annotations.

• Loosened matching of return type of @Provide to enable generic provider method’s in derived container classes.

1.1.0

User guide and javadoc

• Added capability to collect arbitrary providers and configurators in domains

• Added Arbitraries.defaultFor(TypeUsage typeUsage)

• Added capability to generate objects from their type’s constructors and factories

• Breaking Change: Best fit search for provider methods is no longer supported. Reason: Using @Domain requires less magic and is a better abstraction for automatic arbitrary provision.

• Update to JUnit Platform 5.4

1.0.0

User guide and javadoc

• Removed all deprecated APIs
  • Annotation attribute net.jqwik.api.Property.reporting()
  • Class net.jqwik.api.Tuples
  • Method net.jqwik.api.providers.TypeUsage.getAnnotation()

• jqwik now produces three artefacts: jqwik-api, jqwik-engine, jqwik

• Filled in some missing parts in API Javadoc

• Introduced Arbitrary.allValues()

• Adding annotations from JUnit Jupiter or Vintage engine will lead to warnings being logged

• Range annotations (IntRange etc.) don’t need max attribute any more

• @Positive and @Negative constraints no longer include 0 as possible value

• Added @org.apiguardian.api.API annotation to all types in net.jqwik.api.**

• Added annotation @Disabled as a means to temporarily skip test methods or test containers

0.9.x

0.9.3

User guide and javadoc

• The probability of edge cases being generated is now higher
• New constraint annotation @NotEmpty
• Arrays and varargs parameters hand configuration annotations down to their component type arbitrary
• Properties with unconstrained wildcards will now use any registered arbitrary for value generation
• Added Arbitraries.frequencyOf()
• Added Arbitraries.recursive()
• Integral number generation generates a few more edge cases
• You can use @Size to constrain the generation of ActionSequence parameters
• Some incompatible changes to the ActionSequence interface
• jqwik.jar does no longer deliver a jqwik.properties file in its classpath
• jqwik logs WARNING if unsupported property is used in jqwik.properties file
• Replaced configuration file property rerunFailuresWithSameSeed by `defaultAfterFailure’
• Introduced @Property(afterFailure)
• ArbitraryConfiguratorBase has new method acceptType(TypeUsage), which can be overridden.
• Added two new after-failure-modes: SAMPLE_ONLY and SAMPLE_FIRST
• Action sequences for state-based properties are serializable now in order to enable SAMPLE_ONLY and SAMPLE_FIRST

0.9.2

• Exhaustive generation works for ambiguous arbitrary resolution if each arbitrary can be generated exhaustively
• Fixed bug related to correct throwable propagation when shrinking
• Erroneous properties will also be shrunk now

0.9.1

• Container shrinking tries one more thing to get smaller results
• Removed RandomGenerator.reset() since it’s no longer needed for uniqueness behaviour

  This is an incompatible API change!

• Arbitrary.unique() does no longer propagate uniqueness across usages of same arbitrary.
• Implemented exhaustive generation for Arbitrary.unique()
• Fixed bug when resolving recursive types
• Added Arbitraries.shuffle() as a way to generate permutations
• Implemented exhaustive generation for Arbitraries.frequency()
• Changed display name of test engine to “jqwik for Java”
• Per default jqwik no longer uses the JUnit platform reporter for reporting because Gradle does not support it yet
• Using JUnit platform reporter can now be configured
• @Size: min and max values can be used without the other
• @StringLength: min and max values can be used without the other
• Implemented exhaustive generation for Arbitrary.flatMap()
• Implemented exhaustive generation for Arbitraries.oneOf()
• Implemented exhaustive generation for Arbitraries.strings()
• Support default generation of Iterables and Iterators

0.9.0

• Removed deprecated static methods in Arbitraries
• Removed deprecated method ArbitraryProvider.provideFor(TypeUsage targetType, Function<TypeUsage, Optional<Arbitrary<?>>> subtypeProvider)
• Removed default implementation of ArbitraryProvider.provideFor(TypeUsage targetType, SubtypeProvider subtypeProvider)
• Removed deprecated annotation @Digits
• Renamed TypeUsage.getAnnotation(Class annotationClass) to findAnnotation
• Added TypeUsage.isAnnotated(Class annotationClass)
• Added Arbitrary.unique()
• Added constraint @Unique
• Implementations of ArbitraryConfigurator can optionally implement int order()
• It’s now possible to “flat combine” arbitraries
• Deprecated all types and methods in net.jqwik.api.Tuples.* in favour of net.jqwik.api.Tuple.*
• There are new tuple types Tuple5 up to Tuple8
• Data-Driven Properties: Feed data into your properties instead of randomized generation
• Display names of test containers and properties will now automatically be prettified, i.e. each underscore will be replaced by a single space.
• Added @Report annotation to replace Property.reporting
• Added exhaustive value generation

0.8.x

0.8.15

• StringArbitrary.withChars() now accepts varargs.
• Added StringArbitrary.whitespace()
• Added @Whitespace annotation
• Improved shrinking of action sequences
• Default String generation does no longer generate Unicode “noncharacters” or “private use characters”
• Added StringArbitrary.all() for also generating Unicode “noncharacters” and “private use characters”

0.8.14

• Some potentially incompatible stuff has changed for default arbitrary providers:
  • Introduced ArbitraryProvider.priority()
  • The old ArbitraryProvider.provideFor(TypeUsage, Function) is now deprecated, override ArbitraryProvider.provideFor(TypeUsage, SubtypeProvider) instead
  • If more than one provider fits a given type, one of the will be chosen randomly
• Arbitraries.defaultFor() will randomly choose one arbitrary if there is more than one fitting registered arbitrary provider

0.8.13

Faulty release. Do not use!

0.8.12

• Implemented generic type resolution to enable contract tests
• Renamed GenericType to TypeUsage

  This is an incompatible API change!

0.8.11

• Reporting with Reporting.FALSIFIED now reports much less, and hopefully no wrong values anymore.
• Shrinking with filtered values finds simpler values in some circumstance
• Generation of strings will allow any unicode character by default
• Combinators.combine() can now take a list of arbitraries of same return type.
• Generated edge cases are now injected again and again and not only in the beginning.
• Complete re-implementation of shrinking with a few implications:
  • Shrinking should work better and more efficient overall. There might be situations, though, in which shrinking does no longer find the simplest example.
  • ShrinkingMode.BOUNDED might interrupt shrinking with completely different results.
  • When using Reporting.FALSIFIED you will see different inbetween shrinking steps that before.
  • The public interface of Shrinkable has changed in an incompatible way, but that shouldn’t affect anyone but myself.

0.8.10

• Fixed shrinking bug that could result in integers not being shrunk as far as possible
• Integer shrinking should be faster in most cases and cover more cases

0.8.9

• Some minor but potentially incompatible API changes in GenericType.
• Tags from parent (e.g. container class) are now also present in children (methods)
• Renamed ShrinkingMode.ON to ShrinkingMode.FULL

  This is an incompatible API change!

• Introduced ShrinkingMode.BOUNDED and made it the default
• Introduced ShrinkingMode.FULL
• Some bounded wildcard types and type variables can be provided automatically

0.8.8

• Added Arbitraries.lazy() to allow recursive value generation
• Added Arbitrary.fixGenSize() to enable a fixed genSize when creating random generators
• Added Arbitrary.sequences() to create sequences of actions for stateful testing

0.8.7

• Property methods that also have Jupiter annotations are skipped
• Added @Label to allow the labeling of examples, properties and containers
• Changed license from EPL 1.0 to EPL 2.0
• Added @Tag to allow the tagging of examples, properties and containers
• User guide: Added links to example sources on github
• Added Arbitraries.frequency() to enable choosing values with weighted probabilities
• Collection and String generation now explores a wider range of sizes and lengths

0.8.6

• BigInteger generation does no longer support @LongRange but only @BigRange

  This is an incompatible API change!

• BigDecimal generation does no longer support @DoubleRange but only @BigRange

  This is an incompatible API change!

• BigInteger generation now supports numbers outside long range
• Property.seed is now of type String

  This is an incompatible API change!

• Property methods without @ForAll parameters are now also tried as many times as specified by tries parameter.
• Added new method Arbitraries.constant()
• Added new method Arbitraries.defaultFor()
• @WithNull.target() has been removed

  This is an incompatible API change!

• Parameterized types can now be annotated directly
• Added @Size.value() for fixed size collections
• Added @StringLength.value() for fixed size Strings

0.8.5

• All decimal generation (float, double, BigDecimal) now uses BigDecimal under the hood
• All integral generation (int, short, byte, long, BigInteger) now uses BigInteger under the hood
• Numbers are now generated within their full domain (min, max)
• Decimal shrinking improved
• Fixed bug: Reporting.FALSIFIED now also works for falsification through exception
• Added support for running all tests in a module (Java 9 only). I HAVE NOT TESTED IT!

0.8.4

• Completely rebuild the annotation-based configuration of registered arbitrary providers
• Introduced fluent configuration interfaces
• Introduced Arbitrary.list/set/stream/optional/array
• Combinators.combine() now allows up to 8 parameters
• Character creation does no longer support @Chars but only @CharRange

  This is an incompatible API change!

• ‘Arbitraries.chars(char[] validChars)’ does no longer exist

  This is an incompatible API change!

• Added Arbitraries.oneOf
• @Char cannot take from and to any longer. Replaced by @CharRange
• Deprecated many methods in Arbitraries class. Replaced by fluent interface methods.
• Deprecated @Digits constraint. Replaced by @NumericChars.
• Upgrade to JUnit 5.1.0

0.8.3

• Bugfix: Injected empty list samples are now mutable
• Bugfix: Injected empty set samples are now mutable
• Unbound type variables in properties can now be provided

0.8.2

• Added support for java.util.Random generation.
• Added Tuple types (Tuple2, Tuple3, Tuple4) to use in Arbitrary.flatMap().
• Renamed ReportingMode to Reporting and removed Reporting.MINIMAL.

  This is an incompatible API change!

• Added Reporting.FALSIFIED. See section on optional property parameters

0.8.1

• Added support for default arbitrary providers.
• Added support for byte and Byte generation.
• Added support for short and Short generation.

0.8.0

The first release published on maven central.