Experimental JUnit support in Android + Kotlin not working

Question

Google recently released experimental support for running junit on local JVM in Android Studio. I wanted to try it out and since I am developing my Android app using Kotlin I want my tests classes be written in Kotlin too.

Unfortunately, I can't make it working. I have updated my gradle configuration:

sourceSets {
    main.java.srcDirs += 'src/main/kotlin'
    androidTest.java.srcDirs += 'src/androidTest/kotlin'
    test.java.srcDirs += 'src/test/kotlin'//this line was added
}
testCompile 'junit:junit:4.12'
testCompile "org.mockito:mockito-core:1.9.5"

Android Studio recognise test folder.

This is my simple test class just to see if it works

public class MyFirstTestClass {

    [Test] fun firstTest() {
        println("I am OK")
        Assert.assertTrue("".isEmpty())
    }
}

If I try to run it I get the following message

Class not found: 'com.example.MyFirstTestClass'

Natalia Selezneva · Accepted Answer · 2015-07-30 07:56:18Z

4

Unfortunatly, kotlin-gradle plugin doesn't support Junit tests for Android at this moment.

EDIT: Junit support for android was added in Kotlin M12

edited Jul 30, 2015 at 7:56

answered Feb 26, 2015 at 9:38

Natalia Selezneva

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3 Comments

m00sey Over a year ago

For completeness, you can still use Java based unit tests to test your Kotlin classes.

ZakTaccardi Over a year ago

is there any way to auto-generate a java junit test for a kotlin class? Go To -> Test is greyed out for me unfortunately for .kt classes

Jayson Minard Over a year ago

In Kotlin Beta 1 RC announcement it was mentioned that "The last but not least, unit testing experience is much smoother now. List of improvements: “Create Test” action, tests are runnable via gutter icons, navigation between tests and test subjects (⇧⌘T/⇧^T) and also quickfixes to add dependencies on JUnit and TestNG when needed" ... which gives you those features you are looking for with navigating unit tests. @ZakTaccardi

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