Run Gradle test and not Junit test in IntelliJ IDEA 15 when choosing configuration type to run with

I found the solution. They have changed the way you select this option in the new version of intellij 15.02.

You have to select Gradle Test Runner.

Please take a look:

In modern versions of IntelliJ (I have Ultimate 2019.2.3) here's what you need to update:

Update from "Gradle" to "IntelliJ IDEA"