title: Configuring res srcDirs for androidTest sourceSet
body: <p>I'd like to include resources to be compiled only for testing.</p>
  
  <p>I have the following in my app module build.gradle file:</p>
  
  <pre><code>android {
  
      ...
  
      sourceSets {
          androidTest {
              java.srcDirs = ['src/androidTest/java']
              res.srcDirs = ['src/androidTest/res']
          }
      }
  }
  </code></pre>
  
  <p>The java srcDirs path is correct, yet if I try to get a resource from the res directory in androidTest, the resource can't be found.</p>
  
  <p>How can I have resources in the androidTest directory that are only included for tests?</p>