Running unit tests on a Java sub-project in Android Studio

Question

I am not able to run any JUnit test on a Gradle sub-project in Android Studio. This project does not rely on Android in any way, it uses only the Java Gradle plugin.

The Android Gradle project has the following folder structure:

• settings.gradle
• app/build.gradle
• backend/build.gradle

settings.gradle lists the two sub-projects:

include ':app', ':backend'

The app folder contains an Android project. It's build.gradle file looks like this:

buildscript {
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:0.5.6'
    }
}
apply plugin: 'android'
android {
    compileSdkVersion 18
    buildToolsVersion "18.0.1"
}
dependencies {
    compile project(':backend')
}

The backend folder contains a normal Java Gradle project, which app depends on. It's build.gradle file looks like this:

apply plugin: 'java'
repositories {
    mavenCentral()
}
dependencies {
    testCompile 'junit:junit:4.11'
}

The backend project has several unit tests located in src/test/java/... When I try to execute any of them, I get an error stating the Android Studio cannot find the test class:

Class not found: "com.test.DummyTest"
Process finished with exit code 1

Executing gradle test works as expected. Is there any configuration I have missed, or is it plain impossible to get the unit tests to work in Android Studio?

Answer 1

Support for running JUnit test in Java modules was added in version 0.3.6 of Android Studio: https://code.google.com/p/android/issues/detail?id=60916