How to create a new test folder called Kotlin for android studio - android-studio

Question

Android Studio 3.1 Canary 4
Build #AI-171.4444016, built on November 10, 2017
JRE: 1.8.0_152-release-1012-b01 amd64
JVM: OpenJDK 64-Bit Server VM by JetBrains s.r.o
Linux 4.13.16-302.fc27.x86_64
Hello,
I have the following project structure. However, as I have some kotlin files I want to create a new folder called kotlin under test and create a new package and store all my kotlin files there.
Currently I have one called Java, but I want to create the kotlin, but can't seem to be able to find out how to do it.
I would like to do the same for androidTest as well, so I can separate all my java and kotlin files.

Answer 1

Would like to give credit to denvercoder9 who posted the link to the proandoriddev.com article which solved my problem.
In my build.gradle file I have the following which worked for both the test and androidTest folders. However, I needed to create the folders first.
sourceSets {
main { java.srcDirs = ['src/main/java', 'src/main/kotlin'] }
test.java.srcDirs += 'src/test/kotlin'
androidTest.java.srcDirs += 'src/androidTest/kotlin'
}
If anyone need any help on this you can reply back to this solution.

Answer 2

Android Testing with Kotlin
Basically, the idea is to showcase how we can test our android applications using Kotlin, so as a first step we need to setup and prepare our environment by adding Kotlin dependencies in our build.gradle file:
buildscript {
repositories {
mavenCentral()
jcenter()
}
dependencies {
classpath 'org.jetbrains.kotlin:kotlin-gradle-plugin:1.0.5-2'
}
}
apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
...
dependencies {
...
compile "org.jetbrains.kotlin:kotlin-stdlib:1.0.6"
...
testCompile 'org.jetbrains.kotlin:kotlin-stdlib:1.0.6'
testCompile 'org.jetbrains.kotlin:kotlin-test-junit:1.0.6'
testCompile "com.nhaarman:mockito-kotlin:1.1.0"
testCompile 'org.amshove.kluent:kluent:1.14'
}
Now we need to set the dedicated directories for tests written in Kotlin, this is done in our sourceSets section:
android {
...
sourceSets {
test.java.srcDirs += 'src/test/kotlin'
androidTest.java.srcDirs += 'src/androidTest/kotlin'
}
...
}
This tutorials walks us through the process of using Java and Kotlin in a single IDEA project.