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`Class not found: com.package.Class. Empty test suite.` Android Studio, why?
Some of details. Trying to test Java Library module in AS which depends ob another Java Library and another library's test-scope classes. Java tests work. Why?

miha-x64: check to make sure the product flavors of your modules are lined up correctly in the build variant section

<@U1PEF150S> I have no flavors and build variants in this module :slightly_smiling_face:

Solved by adding `apply plugin: 'kotlin'`

I tried that and it failed at `apply plugin: 'kotlin-android'` :cry:

themarketka: What is the text of your error message? Which version of Kotlin plugin you are using?

It keeps saying "Empty test suite.", sometimes "class not found" with the class that contains the tests, plugin `1.0.6-release-IJ2016.3-1`

Make sure all your modules with Kotlin contain appropriate ‘apply plugin’, this helped for me

```
apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-kapt'
apply plugin: 'io.fabric'
apply plugin: 'com.getkeepsafe.dexcount'
```
that’s in the tested module’s build.gradle

I don’t know then :disappointed:. Can you build the project?

Maybe I’m running the tests wrong… The project builds and runs fine, it just can’t find the tests, like if the class with test wasn’t even on classpath or something

Even unit tests alone work, but not these instrumentation ones (`@RunWith(AndroidJUnit4::class)`)

Might be a good thing to see if the same would run were it in the `androidTest/java` dir as Java instead of `androidTest/kotlin`.

And yes, I have this:
```
sourceSets {
        main.java.srcDirs += 'src/main/kotlin'
        test.java.srcDirs += 'src/test/kotlin'
        androidTest.java.srcDirs += 'src/main/kotlin'
        androidTest.java.srcDirs += 'src/androidTest/kotlin'
        ...
}
```

`androidTest.java.srcDirs += ‘src/main/kotlin’` looks suspiciously.

you should put kotlin files in src/main/java

no need for a second `src/main/kotlin` dir