Android Studio / Gradle test folder naming convention

Question

Android Studio / Gradle test folder naming convention

I saw a lot of tutorials and supporting projects for testing in the Android Studio / Gradle project. I am interested to know the test folder naming convention. I saw two similar names: test and androidTest . Is there any real difference? Is the IDE / Gradle processing data differently?

Appendix
- CSI
  - androidTest
    - Java
  - Main
    - Java
    - Res

vs

Appendix
- CSI
  - test
    - Java
  - Main
    - Java
    - Res

EDIT:

@jonalmeida So, if I read this documentation correctly, my build.gradle dependencies should match the original set, right?

 dependencies { // dependency injection compile 'com.squareup.dagger:dagger:1.2.1' provided 'com.squareup.dagger:dagger-compiler:1.2.1' // networking compile 'com.squareup.retrofit:retrofit:1.6.1' // testing androidTestCompile 'org.easytesting:fest:1.0.16' androidTestCompile 'junit:junit:4.+' androidTestCompile 'org.robolectric:robolectric:2.3' testCompile 'com.squareup:fest-android:1.0.8' // <---- this guy won't work }