Try to make sure your add-on subprojects have the same name in Gradle as their subdirectories.
For example, if you have the following composite project structure:
all/
build.gradle
settings.gradle
users/
users/
users-starter/
build.gradle
settings.gradle
And in all/settings.gradle:
rootProject.name = 'all'
includeBuild '../users'
// ...
Then in users/settings.gradle you should set the project name as follows:
rootProject.name = 'users'
Then IntelliJ test runner will form the gradle task name correctly.
Alternatively, you can change it in the Run/Debug Configuration of the test:
