switching org.jetbrains.intellij.platform from 2.5.0 to 2.6.0 will break Integration tests setup: all classes from com.intellij.ide.starter will be “invisible” for compiler:
Is it known issue? Am I missing something?
IntelliJ Platform Gradle Plugin no longer includes in transitive dependencies plugins marked as optional. To get this working, you should add a dependency on that particular plugin manually.