How to add a new source directory to an Android Studio project?

Question

So ultimately I'm trying to separate my integration tests from the unit tests in an Android Studio project. I've found a few resources on the subject:

• http://selimober.com/blog/2014/01/24/separate-unit-and-integration-tests-using-gradle/
• https://blog.safaribooksonline.com/2013/08/22/gradle-test-organization/
• Separating integration tests from unit tests in Android Studio

All these seem to indicate that the way to go is to create a new sourceSet for the integration tests, and then to create a new test task which builds and runs the tests in that source set. I can't get past the first step of creating a source set which is recognized by Android Studio.

Here's what I have within app/build.gradle, which builds without errors, but does not result in an integrationTest source root I can add classes to:

android{
    ...
    sourceSets{
        integrationTest {
           java.srcDir('src/integrationTest/java')
        }
    }
}

My questions are:

1. Where precisely do I have to add the sourceSets block? In build.gradle? in app/build.gradle? In app/build.gradle inside the android block?

2. Once I've added my source set in he right place using the correct syntax, is this sufficient for Android Studio to detect and present it in the UI along side the main and test sources, or are there additional steps?

edit:

I've attempted to follow the instructions in marius' answer, but integrationTest isn't showing up in my build variants. Here's what I'm seeing:

Answer 1

This is enough:

android{
    ...
    productFlavors{
        integrationTest {
        }
    }
}

Regarding your 1st question : The productFlavors block should be in your app/build.gradle , inside android block.

Regarding your 2nd question : Once you add this to your build.gradle file, you also need to create your folders /src/integrationTest and /src/integrationTest/java . Once that is done, sync your gradle files and choose your new Build Variant from the Build Variant window, in order for the IDE to detect it as the active source folder.