title: How to resolve "multiple dex files define Lorg/junit/runner/Runner" in Android Studio
body: <p>I'm trying to run instrumentation tests inside Android Studio.</p>
  
  <p>I already researched and tried a lot, but I can't get past this error message.</p>
  
  <p>My modules dependencies:</p>
  
  <p>(compile)</p>
  
  <pre><code>+--- com.crashlytics.sdk.android:crashlytics:2.5.5
  |    +--- com.crashlytics.sdk.android:answers:1.3.6
  |    |    \--- io.fabric.sdk.android:fabric:1.3.10
  |    +--- com.crashlytics.sdk.android:crashlytics-core:2.3.8
  |    |    +--- com.crashlytics.sdk.android:answers:1.3.6 (*)
  |    |    \--- io.fabric.sdk.android:fabric:1.3.10
  |    +--- io.fabric.sdk.android:fabric:1.3.10
  |    \--- com.crashlytics.sdk.android:beta:1.1.4
  +--- com.jakewharton:butterknife:7.0.1
  +--- io.realm:realm-android:0.87.5
  +--- com.android.support:appcompat-v7:23.0.1
  |    \--- com.android.support:support-v4:23.0.1
  |         \--- com.android.support:support-annotations:23.0.1
  +--- com.android.support:cardview-v7:23.0.1
  +--- com.android.support:recyclerview-v7:23.0.1
  |    +--- com.android.support:support-v4:23.0.1 (*)
  |    \--- com.android.support:support-annotations:23.0.1
  +--- com.android.support:design:23.0.1
  |    +--- com.android.support:support-v4:23.0.1 (*)
  |    \--- com.android.support:appcompat-v7:23.0.1 (*)
  +--- io.reactivex:rxandroid:1.1.0
  |    \--- io.reactivex:rxjava:1.1.0
  +--- io.reactivex:rxjava:1.1.0
  \--- project :domain
  </code></pre>
  
  <p>(androidTest)</p>
  
  <pre><code>+--- org.jmockit:jmockit:1.22
  \--- com.android.support.test:runner:0.4
       +--- com.android.support:support-annotations:23.0.1
       +--- junit:junit:4.12
       |    \--- org.hamcrest:hamcrest-core:1.3
       \--- com.android.support.test:exposed-instrumentation-api-publish:0.4
  </code></pre>
  
  <p>any help appreciated</p>