cannot create "test" folder in android studio for robolectric

I want to add robolectric tests to my project in intellij.

I have tried to follow this tutorial

but I cannot add "test" package under my main module.

In addition the "build variants" look different than in the tutorial.

how can I fix this?

how can I add test class properly?

this is not the way, the good architecture is:

/app
    /src
        /main
             /java
                  /com.your.package
        /test
             /java
                  /com.your.package

and don't forget to write it in the app module build.gradle

android {
  sourceSets {
    main { java.srcDirs = ['src/main/java'] }
    test { java.srcDirs = ['src/test/java'] }
  }
}