[SOLVED] Android FEST not compiling properly for unit tests in IDE

Android FEST not compiling properly for unit tests in IDE

For some reason, Android Studio is not properly compiling the Android FEST library (?).

This line,

assertThat(someView).isNotVisible();

causes this exception to be thrown:

java.lang.UnsupportedClassVersionError: org/fest/assertions/api/ANDROID : Unsupported major.minor version 51.0

and the import that i used is: import static org.fest.assertions.api.ANDROID.assertThat;

What's going on?

Oh, and it should be noted that the gradle task to run unit tests run just fine (but just not for IDE).

Solution

THis means that the library was compiled with a later version of Java than what you're using to do builds in the IDE. v51.0 is Java 7, so you need to have JDK 7 available and set Android Studio to use it via Project Structure > SDK location.

Note that you don't need to run the IDE itself using Java 7 if you don't want, and you don't have to turn on Java 7 compatibility in your projects; you just need to use Java 7 to do the builds themselves.