fix robolectric

android/app/build.gradle

 
     // tests
     testCompile "junit:junit:4.12"
-    testCompile "org.robolectric:robolectric:3.1.1"
+    testCompile "org.robolectric:robolectric:3.1.4"
     testCompile 'org.assertj:assertj-core:3.5.2'
 }