I saw one problem during project upgrade.
Before upgrade setup:
Java - 1.8
Scala - 2.12
sbt - 1.5.0
sbt-jacoco - 3.1.0
Overall test coverage in SonarQube: ~72%
After upgrade:
Java - 17
Scala - 2.13
sbt - 1.10.11
sbt-jacoco - 3.4.0
Overall test coverage in SonarQube: ~62%
With upgrade of sbt-jacoco our overall test coverage decreased by ~10%.
After some investigation we found that sbt-jacoco 3.4.0 now counting branches of synthetic methods (e.g. copy$ methods for case classes).
I checked source code of sbt-jacoco and I could see there is appropriate filter (scala synthetic methods) implemented, but looks like it doesn't work, or maybe I should enable it somehow during launching jacoco command.
In addition it also counting plain getters starting from sbt-jacoco 3.4.0, but per jacoco it shouldn't.
UPD
@aled, @Gaël J, you are right, I should add some example. And the question is "how to exclude synthetic methods from SBT Jacoco report"
Here is before upgrade (should be launched with Java 1.8): https://github.com/ppllaxxa/sbt-jacoco-test
After upgrade (should be launched with Java 17): https://github.com/ppllaxxa/sbt-jacoco-test-upgrade
To generate jacoco report just execute in sbt shell: clean coverageOn jacoco coverageReport coverageOff
Report will be located here: sbt-jacoco-test\target\scala-2.12\jacoco\report\html Before upgrade
sbt-jacoco-test-upgrade\target\scala-2.13\jacoco\report\html After upgrade
