java-ddd-example VS readable-tests-by-example

This is my filtered list of open-source projects that I use for learning: https://github.com/codurance/academy-walking-skeleton/blob/main/simpleWebservice/src/main/java/com/kata/SimpleWebservice/UserRepository.java https://github.com/bwajtr/java-persistence-frameworks-comparison https://github.com/thombergs/code-examples/tree/master/spring-boot/spring-boot-testing https://github.com/codurance/all-aboard-backend https://github.com/codurance/gandalf https://github.com/codurance/hotel-kata-boot https://github.com/codurance/hotel-kata-monolith https://github.com/codurance/hotel-kata-raw https://github.com/codurance/mementor https://github.com/codurance/pouch https://github.com/codurance/Retropolis-BE https://github.com/codurance/SalarySlipKata https://github.com/codurance/sessionize https://github.com/codurance/task-list https://github.com/ddd-by-examples/factory https://github.com/doctore/Spring5Microservices https://github.com/eventuate-examples/eventuate-examples-java-customers-and-orders https://github.com/gitpushforcemain/nerdy-jokes-app https://github.com/gothinkster/spring-boot-realworld-example-app https://github.com/gtiwari333/spring-boot-web-application-sample https://github.com/hamvocke/spring-testing https://github.com/hmcts/spring-boot-template https://github.com/IBM/template-java-spring https://github.com/isd-soft https://github.com/jitterted/mobreg https://github.com/jref/covid-19-demo https://github.com/jref/vaccination-start https://github.com/lpalma/merlin https://github.com/mechero/full-reactive-stack https://github.com/mohamed-taman/Springy-Store-Microservices https://github.com/nelkinda https://github.com/OlgaMaciaszek/spring-cloud-netflix-demo https://github.com/pavelfomin/spring-boot-rest-example https://github.com/PravSonawane/fakes-over-mocks https://github.com/remal/java-tools https://github.com/remal/oss-template-java-gradle https://github.com/pavelfomin/resume/blob/master/resume.html.pdf https://github.com/richardjwild/how-to-java https://github.com/rieckpil/java-testing-ecosystem https://github.com/rieckpil/testing-spring-boot-applications-masterclass https://spring.io/guides https://www.javaguides.net/2022/03/spring-boot-unit-testing-service-layer.html?spref=tw https://github.com/spring-petclinic https://github.com/stratospheric-dev/stratospheric https://github.com/tericcabrel/spring-user-management https://github.com/thombergs/buckpal https://github.com/Throyer/springboot-api-rest-example https://github.com/TomSpencerLondon/Quiz https://github.com/vladmihalcea/high-performance-java-persistence https://github.com/Vukan-Markovic/Distributed-information-systems https://github.com/yacekmm/testingDemo https://github.com/kamaruzzaman https://github.com/evrentan?tab=repositories https://github.com/ConstantinKV/demo-sca-provider https://github.com/sqshq/piggymetrics https://github.com/ESchouten/CleanArchitecture https://github.com/CodelyTV/java-ddd-example https://github.com/lsoares/clean-architecture-sample https://github.com/mattia-battiston/clean-architecture-example https://github.com/techyourchance https://github.com/ttulka/ddd-example-ecommerce-microservices https://github.com/ttulka/ddd-example-ecommerce https://github.com/victorrentea/clean-architecture https://github.com/victorrentea/clean-code-java https://github.com/victorrentea/ddd https://github.com/victorrentea/integration-testing-spring

IMO opinion in unit tests is not necessary. You should have pure Java interface and implementation in menory. I,ve found great example that show this approach with hexagonal architecture. https://github.com/CamilYed/readable-tests-by-example

You can see this great example which shows how you can use new fearutes which comes with Java 17.