Pitest (aka PIT) is a state of the art mutation testing system for Java and the JVM.

Read all about it at http://pitest.org

Releases

1.5.2

#749 ANT support for the fullMutationMatrix option (thanks @ayaankazerouni)
#752, #755, #757 Version bumps and legacy code improvements (thanks @AlexElin)
#758 Correctly can for test packages (thanks @nicerloop)
#765 Fix incremental analysis for TestNG (thanks @StefanPenndorf)

1.5.1

#737 Add skipFailingTests flag to command line tool (thanks @szpak)
#739 Fix typo in error message (thanks @vmellgre)
#745 Improve error message when junit not on classpath (thanks @szpak)
#748 Bump asm to 8.0 for Java 14 support

1.5.0

#556 - Do not mutate enum constructors
#726 - Ensure static initializer coverage is recorded
#734/#735/#736 - Replace legacy interfaces with Java API (thanks @AlexElin)

1.4.11

#683 - Filter try-with-resources before filtering inlined code (thanks @Vampire)
#686 - Do not print the class name twice for unsplittable test units (thanks @Vampire)
#672 - Do not include the current directory to the minion class path (thanks @Vampire)
#692 - Add property='skipPitest' to skip attribute inn maven plugin (thanks @cjgwhite)
#697 - TestNG 7.0.0 compatibility (thanks @kris-scheibe)
#666 - UOI4 reports mutated field name (thanks @LaurentTho3)
#716 - Bump asm to 7.3.1 (required for Java 14)
#710 - Use the new mutator set by default

1.4.10

#534 Smaller blocks for more precise test targeting (thanks @jon-bell)
#664 Fix A0D2 map key (thanks @Vampire)
#656 Escape characters in init methods for html report (thanks @Vampire)
#404 Filter junk mutations to compiler generated Objects.requireNonNull calls

1.4.9

#613 / #623 - Fix for powermock issues on (thanks @jon-bell)
#614 - Improved error message when no test plugin (thanks @szpak)
#620 - Support annotation processors such as Micronaut that do not set debug filename

1.4.8

#597 Fix for bug in coverage when large number of classes (thanks @jon-bell)
#601 Avoid stealing keyboard focus on macos (thanks @maxgabut)

1.4.7

#545 - Faster coverage calculation (thanks @jon-bell)

1.4.6

#580 - upgrade to ASM 7.1
#573 - Ant support for testPlugin and failWhenNoMutations (thanks @mduggan)
#555 - Allow empty elements in maven configuration (thanks @maxgabut)

1.4.5

#557 - Issues running on Java 8

Older versions

1.4.4

#518 - Experimental BigInteger mutator (thanks @ripdajacker)
#513 - Sort mutators in html report (thanks @ThLeu)
#553 - Classic mutators from literature (thanls @LaurentTho3)
#528 - Added skipFailingTests option from maven plugin (thanks @nicerloop)

1.4.3

#510 - Compute mutation test matrix (thanks @nrainer)
#519 - Java 11 support

1.4.2

#500 - Support for large classpaths with new useClasspathJar option (thanks @jqhan)

1.4.1

#446 - Ignore empty directories when aggregating report (thanks @maxgabut)
#457 - Fix base dir in multi module projects (thanks @sarahBuisson and @giggluigg)
#471 - Basic Java 11 support
#477 - Null byte in xml (thanks @maxgabut)
#480 - Allow aggregation of timestamped reports (thanks @maxgabut)
#495 - Move summary to end of console output (thanks @pedrorijo91)
#499 - Fix for equivalent mutants in new return val mutators

1.4.0

#445 - Raise minimum supported java version to 8
Switch to ASM 6.1.1
#448 Aggregate report based on module (thanks @sarahBuisson)
#462 Escape test names in coverage xml (thanks @maxgabut)

1.3.2

#433 - Aggregate reports via maven (thanks @rchargel)
#438 - Filter tests at method level (thanks @ftrautsch)
#439 - Primitives return mutator doesn't handle bytes
#380 - Remove reliance on xstream for improved java 9 support
#414 - Replace xstream history store (thanks @kiftio)

Note when upgrading that history files generated by previous releases are not compatible with 1.3.2 an above.

1.3.1

#434 - XStream security warning

1.3.0

#196 - Raise minimum java version to 7
#425 - Broaden for-each detection
#428 - Add excludedTestClasses parameter
#379 - Remove support for mutating static initializers
#432 - Add export plugin functionality into pitest
#427 - Better return values mutators
#429 - Simplify test api

428 changes the existing behaviour of the excludedClasses filter. Previously this excluded classes from both being mutated and run as tests which may require changes for some people when upgrading.

As a result of 429 TestNG tests will no longer be automatically detected - the new testPlugin parameter must be explicitly set to "testng".

1.2.5

#407 - SCM goal cannot be run from within module (thanks @sbuisson)
#256 - Inline style violate Content Security Policy (thanks @kiftio)
#403 - No css in the html report viewed from jenkins (thanks @kiftio)
#409 - Mutate based on changes across branched (thanks @sbuisson)
#418 - Avoid for loop increments
#424 - Avoid for each code
#389 - Widen matching of implicit null checks

1.2.4

#397 - Report reasons maven modules skipped
#389 - Filter junk getClass null checks in lambdas
#400 - Update to ASM 6.0

1.2.3

Update to ASM 6 for Java 9 support
#388 - Mark maven plugin as threadsafe
#362 - Suppress common equivalent mutant in equals methods

1.2.2

#367 - Static analysis cannot find core classes in some projects

1.2.1

#347 - Avoid autogenerated code (e.g by lombok) anotated with @Generated
#285 - Avoid compiler generated conditionals in switch on string. (thanks @Kwaq)
#218 - New "naked receiver" / method chain mutator. (thanks @UrsMetz)
#354/#356 - New extension point plus changes to reduce cost of random access to bytecode for static analysis
#353 - Improved static initializer code detection
#364 - Filter infinite loops via static analysis
#365 - Configuration system for plugins

(Note #347 will not detect javax.annotaion.Generated as it has only source retention.)

1.2.0

#318 - Separate main process code from code sharing client classpath
#295 - Ignore abstract TestNG tests
#215 - Automatic selection of target classes for maven
#314 - Do not fail for maven modules without tests or code
#306 - Do not fail when only interfaces are in changeset
#325 - Anonymous class in Spock test causing error
#334 - Compatibility with recent TestNG releases
#335 - Incorrect coverage with powermock

Note - as of this release the maven plugin will automatically determine which classes to mutate instead of assuming that the package names match the group id.

1.1.11

#269 - Not possible to break build on 1 mutant
#271 - Include method descriptor in line coverage
#170 - Exclusion by JUnit runner
#291 - Handle empty excludes
#287 - Check class hierarchy for annotations
#289 - Option to supply classpath from file

1.1.10

#260 - Initial support for mutating Kotlin code
#264 - Support for yatspec runner (thanks @theangrydev)
Break build when more than maxSurviving mutants survive

1.1.9

#132 - Allow analysis of only files touched in last commit (thanks Tomasz Luch)

1.1.8

#239 - Provide a shortcut to set history files via maven
#240 - Support for regexes (thanks sebi-hgdata)
#243 - Use ephemeral ports to communicate with minions

1.1.7

#196 - Raise minimum java version to 1.6
#231 - Process hangs

1.1.6

#10 - Add maven report goal (thanks jasonmfehr)
#184 - Remove undocumented project file feature
#219 - Performance improvement for report generation (thanks tobiasbaum)
#190 - Allow custom properties for plugins

Note this release contains a known issue (#231). Please upgrade.

1.1.5

Fix for #148 - Stackoverflow with TestNG data providers when using JMockit
Fix for #56 - Not reporting junit incompatibilities
Fix for #174 - Invalid linecoverage.xml with static initializers
Fix for #183 - Can't run GWTMockito tests
Fix for #179 - Broken includeLaunchClasspath=false on Windows
#173 - Read exclusions and groups from maven surefire config

1.1.4

#157 - Support maven -DskipTests flag (thanks lkwg82)
Fix for #163 - Should not include test tree in coverage threshold
#166 - Allow classpath exclusions for maven plugin (thanks TomRK1089)
#155 - Restore Java 5 compatibility
Fix for #148 - Issue with JMockit + TestNG (thanks estekhin and KyleRogers)

1.1.3

Fix for #158 - Tests incorrectly excluded from mutants
Fix for #153 - SCM plugin broken for maven 2
Fix for #152 - Does not work with IBM jdk

1.1.2

Fix for #150 - line coverage under reported

1.1.1

Block based coverage (fixes 79/131)
End support for running on Java 5 (java 5 bytecode still supported)
Skip flag for maven modules (#106)
Stop declaring TestNG as a dependency
New parameter propagation mutator (thanks UrsMetz)

1.1.0

Change scheme for identifying mutants (see hcoles#125)
Support alternate test apis via plugin system
Report error when supplied mutator name does not match (thanks artspb)
Report exit codes from coverage child process (thanks KyleRogers)
Treat JUnit tests with ClassRule annotation as one unit (thanks devmop)

Please note that any stored history files or sonar results are invalidated by this release.

1.0.0

Switch version numbering scheme
Upgrade to ASM 5.0.2
Fix for #114 - fails to run for java 8 when -parameters flag is set
#99 Support additionalClasspathElements property in maven plugin (thanks artspb)
#98 Do not mutate java 7 try with resources (thanks @artspb)
#109 extended remove conditional mutator (thanks @vrthra)

0.33

Move to Github
Upgrade of ASM to support Java 8 bytecode (thanks to "iirekm")
Partial support for JUnit categories (thanks to "chrisr")
New Remove Increments Mutator (thanks to Rahul Gopinath)
Minor logging improvements (thanks to Kyle Rogers aka Stephan Penndorf)
Fix for #92 - broken maven 2 support
Fix for #75 - incorrectly ignored tests in classes with both @Ignore and @BeforeClass / @AfterClass

0.32

restores java 7 compatibility
new remove conditionals mutator
support for mutating static initializers with TestNG
properly isolate classpaths when running via Ant
break builds on coverage threshold
allow JVM to be specified
support user defined test selection strategies
support user defined output format
support user defined test prioritisation
fix for issue blocking usage with Robolectric

Note, setup for Ant based projects changes in this release. See ant setup for details on usage.

0.31

Maven 2 compatibility restored
Much faster line coverage calculation
Fix for #78 - Error when PowerMockito test stores mock as member

This release also changes a number of internal implementation details, some of which may be of interest/importance to those maintaining tools that integrate with PIT.

Mutations are now scoped internally as described in https://groups.google.com/forum/#!topic/pitusers/E0-3QZuMYjE

A new class (org.pitest.mutationtest.tooling.EntryPoint) has been introduced that removes some of the duplication that existed in the various ways of launching mutation analysis.

0.30

Support for parametrized Spock tests
Support for JUnitParams tests
Fix for #73 - JUnit parameterised tests calling mutee during setup failing during mutation phase
Fix to #63 - ant task fails when empty options supplied
Ability to override maven options from command line
Ability to fail a build if it does not achieve a given mutation score
Performance improvement when tests use @BeforeClass or @AfterClass annotations
Slightly improved scheduling over multiple threads
Improved maven multi project support
Integration with source control for maven users

0.29

Incremental analysis (--historyInputLocation and --historyOutputLocation)
Inlined code detection turned on by default
Quieter loggging by default
Improved Java 7 support
Upgrade of ASM from 3.3 to 4
Fix for concurrency issues during coverage collection
Fix for #53 - problems with snapshot junit versions
Fix for #59 - duplicate dependencies set via maven

0.28

Inlined finally block detection (--detectInlinedCode)
New experimental switch statement mutator (contributed by Chris Rimmer)
Do not mutate Groovy classes
Fix for #33 - set user.dir to match surefire
Fix for #43 - optionally suppress timestamped folders (--timestampedReports=true/false)
Fix for #44 - concurrent modification exception when gathering coverage
Fix for #46 - incorrect setting of flags by ant task
Smaller memory footprint for main process
Faster coverage gathering for large codebases
Faster classpath scanning for large codebases
Support for JUnit 3 suite methods
Fixes for incorrect detection of JUnit 3 tests

Known issue - Fix for #33 may not resolve issue for maven 2 users.

Detection of Groovy code has not yet been tested with Groovy 2 which may generate substantially different byte code to earlier versions.

0.27

Much prettier reports
Now avoids mutating assert statements
Removed inScopeClasses option - use targetClasses and targetTests instead
Fix for 100% CPU usage when child JVM crashes
Fix for #35 #38 - experimental member variable mutator now corrects stack
Fix for #39 - order of classpath elements now maintained when running from maven

Upgrading users may need to modify their build due to removal of the inScopeClasses parameter

0.26

Ant support
New experimental mutator for member variables
Fix for #12 #27 - no longer hangs when code under test launches non daemon threads
Fix for #26 - now warns when no test library found on classpath
Fix for #30 - now errors if mutated classes have no line or source debug
Fix for #32 - now correctly handles of JUnit assumptions

Known issue - The new member variable mutator may cause errors in synchronized errors. The mutator is however disabled by default, and the generated errors are correctly handled by PIT.

0.25

TestNG support (experimental)
Fix for issue where mutations in nested classes not isolated from each other
Fix for broken classpath isolation for projects using xstream
Improved handling of JUnit parametrized tests
Ability to limit mutations to specific classpath roots (--mutableCodePaths)
Ability to add non launch classpath roots (--classPath) (experimental)
Read configuration values from XML (experimental)
Option to not throw error when no mutations found
Consistent ordering of classes in HTML report
Statistics written to console
Classes no longer loaded during initial classpath scanning
New syntax to easily enable all mutation operations

0.24

JMockit support
Option to output results in XML or CSV
Fix for #11
Improved INLINE_CONSTS mutator

0.23

Fix for issue 7 - source files not located

0.22

Upgrade of Xstream to 1.4.1 to enable OpenJDK 7 support
Fix for #5 - corruption of newline character in child processes
Ability to set child process launch arguments

0.21

Significant performance improvements
Support for powermock via both classloader (requires PowerMockIgnore annotation) and java agent
Minor error reporting and usability improvements
Fix for major defect around dependency analysis
PIT dependencies no longer placed on classpath when running via maven
Support for excluding certain classes or tests
Support for verbose logging

0.20

Limit number of mutations per class
Upgrade xstream to 1.3.1
Make available from maven central

0.19

Built in enum methods now excluded from mutation
Fixed bug around reporting of untested classes
Support for excluding tests greater than a certain distance from class
Support for excluding methods from mutation analysis
Performance improvements
Removed support for launching mutation reports from JUnit runner

0.18

First public release

Issues

Please consult our issue management rules before creating or working on issues.

Credits

Pitest is mainly the work of me but has benefited from contributions from many others.

Notable contributions not visible here as they were made before this code was migrated to github include

Nicolas Rusconi - Ant Task
Struan Kerr-Liddell - Improvements to html report
Stephan Pendorf - Multiple improvments including improved mutators

Although PIT does not incorporate any code from the Jumble project (http://jumble.sourceforge.net/), the Jumble codebase was used as a guide when developing some aspects of PIT.

Other stuff

The codebase is checked up on in a few places that give slower feedback than the github hooks.

maven2 on IBM JDK check

Files

README.md

Latest commit

History