100% code coverage… and your tests still miss bugs? Julius Mischok shows why coverage measures execution, not verification — and how #MutationTesting with #PIT proves whether tests actually fail when code changes.
Add PIT + kill surviving mutants: https://javapro.io/2026/01/21/test-your-tests-mutation-testing-in-java-with-pit/
Deine Tests laufen bei jedem Build? Dann sind sie wichtig genug, getestet zu werden. Julius Mischok zeigt, wie #MutationTesting mit #PIT Schwachstellen in deiner #CI sichtbar macht.
Stärke deine Teststrategie: https://javapro.io/de/teste-deine-tests-mutation-testing-in-java-mit-pit/
If you deleted all assertions, would your coverage drop? Probably not by much, and that’s the problem. Julius Mischok explains why #PIT mutation testing is the missing layer on top of JaCoCo.
Test your tests with PIT: https://javapro.io/2026/01/21/test-your-tests-mutation-testing-in-java-with-pit/
100% code coverage… and your tests still miss bugs? Julius Mischok shows why coverage measures execution, not verification — and how #MutationTesting with #PIT proves whether tests actually fail when code changes.
Add PIT + kill surviving mutants: https://javapro.io/2026/01/21/test-your-tests-mutation-testing-in-java-with-pit/
Deine Tests lügen. Und du glaubst ihnen. Nur #MutationTesting mit #PIT zeigt dir, wo Bugs unentdeckt bleiben. Julius Mischok erklärt, wie du überlebende Mutanten eliminierst.
Schlag zurück: https://javapro.io/de/teste-deine-tests-mutation-testing-in-java-mit-pit/
#MutationTesting #Java #CleanCode #DevOps #DevTools #JAVAPRO
to check if software tests are working properly you can use #mutationtesting
it changes parts of your source code and reruns test. Ideally tests fail then, if not, then the software lacks some important tests
https://en.wikipedia.org/wiki/Mutation_testing
Vertraust du deinen Tests? Dann teste deine Tests. Mit #PIT deckt Julius Mischok auf, wo deine #UnitTests versagen – trotz 100 % Coverage.
Mutanten zeigen dir, wo’s weh tut. Lies jetzt: https://javapro.io/de/teste-deine-tests-mutation-testing-in-java-mit-pit/
#MutationTesting #Java #CleanCode #DevOps #DevTools #JAVAPRO
100 % Testabdeckung & trotzdem Bug im Code? Julius Mischok zeigt, warum #MutationTesting mit #PIT dein Vertrauen in Tests erschüttert & wie du es zurückgewinnst.
So deckst du echte Bugs auf: https://javapro.io/de/teste-deine-tests-mutation-testing-in-java-mit-pit/
prepared a short talk about the basics of #mutationtesting including a few hands-on @infection_php examples for tomorrows @unKonf #unkonf
High coverage ≠ strong tests.
Mutation testing with Quarkus + PIT shows which tests really catch bugs.
Step-by-step tutorial for Java devs:
https://www.the-main-thread.com/p/mutation-testing-quarkus-java-tutorial
Released: @roave /infection-static-analysis-plugin 1.39.0
https://github.com/Roave/infection-static-analysis-plugin/releases/tag/1.39.0
Just upgrading `vimeo/psalm`, while we still work on upgrading `infection/infection` after numerous internal breaking changes in upstream. #php #mutationTesting
past few weeks I have concentrated my opensource efforts onto @infection_php focus was on developer experience - make it easer for newcomers to apply the tool and reduce noise by removing redundant mutations.
this got just released. feedback welcome.
How can you use code coverage and mutation testing to add tests to legacy code? At @mendercon last year, I demonstrated this powerful technique step by step on the Gilded Rose kata, which is hosted by @emilybache on her GitHub account: https://github.com/emilybache/GildedRose-Refactoring-Kata
You can watch the talk here: https://www.youtube.com/watch?v=0qna5cuzDI0
#CSudberyRecordings #CodeCoverage #MutationTesting #GildedRose #Refactoring #UnitTests
Nuevo post:
Usando conjuntamente ApprovalsJs y StrykerJS en WebStorm
https://codesai.com/posts/2025/06/usando-approvalsjs-y-strykerjs-en-webstorm
Suscríbete a nuestra newsletter: https://codesai.com/newsletter/
#legacy_code #mutationTesting #SoftwareEngineering #CodeQuality #Tech
Acabamos de publicar una traducción al español con algunas mejoras y actualizaciones de nuestro post sobre mutation testing "Relevant mutants":
Mutantes relevantes https://codesai.com/posts/2025/04/mutantes-relevantes
#testing #legacy #legacyCode #mutationtesting #tech #typescript #software #SoftwareEngineering
I’ve been a big fan of #MutationTesting since I discovered PIT. As I dive deeper into #Rust, I wanted to check the state of mutation testing in Rust.
Republishing an old @codesai 's post on Dev community:
Relevant mutants
https://dev.to/trikitrok/relevant-mutants-3d67
#legacycode #technicaldebt #cleancode #testing #SoftwareEngineering #TechDebt #CodeQuality #tech #DEVCommunity #mutationtesting
Thanks to all attendees of my evening session on #mutationtesting w/ #strykerNet at this year's .NET-Developers Conference #DDC in Cologne!
You can find the presentation here:
👉 https://draptik.github.io/2024-11-ddc-mutation-testing/
#dotNET
My talk "How to Compare Fuzzers" at SAPLING'24 yesterday is available on line here #SoftwareEnginnering #MutationTesting #Fuzzing
Selbstheilende Testfälle ein technischer Mythos oder Realität?
Selbstheilende was......
Nun erst mal ja, es gibt technische Möglichkeiten, selbstheilende Test
https://www.dev-crowd.com/2024/10/24/selbstheilende-testfaelle-ein-technischer-mythos-oder-realitaet/
#Mocking #MutationTesting #OwaspZap #Penetrationtest #Python #RegressionsTest #Requests #RestAPI #Sandboxtesting #Scapy #Security #Selenium #Server #SystemTestNetzwerk #Testframework #Webdriver
