title: assets dir not found
body: <p>I am trying to add asset files to my android test project but somewhy assets from test dir are not available from inside test classes. What I am doing wrong?
  The purpose is to have additional asset files for test cases.</p>
  
  <p>Compilation is success from IDEA and command line, but test results are the same. </p>
  
  <p>When I am trying to call getContext().getAssets().open("test.json") I have FileNotFoundException.</p>
  
  <p><img src="https://i.stack.imgur.com/8q1EE.png" alt="enter image description here"></p>
  
  <pre><code>buildscript {
      repositories {
          mavenCentral()
      }
      dependencies {
          classpath 'com.android.tools.build:gradle:0.12.0'
      }
  }
  apply plugin: 'android'
  
  repositories {
      mavenCentral()
  }
  
  dependencies {
      compile 'com.android.support:support-v4:13.0.0'
      debugCompile 'com.android.support:support-v13:13.0.0'
  
      compile 'com.google.android.gms:play-services:3.1.36'
  }
  
  android {
  
      compileSdkVersion 19
      buildToolsVersion "19.1.0"
  
      testBuildType "debug"
  
      sourceSets {
          androidTest {
              assets.srcDirs = ['src/androidTest/assets']
          }
  
          androidTest.setRoot('src/androidTest')
      }
  
      defaultConfig {
          versionCode 1
          versionName "1.0"
          minSdkVersion 14
          targetSdkVersion 19
  
          testInstrumentationRunner "android.test.InstrumentationTestRunner"
      }
  
      buildTypes {
          debug {
              applicationIdSuffix ""
          }
      }
  }
  </code></pre>