FEST-Android doesn't have an api to compare primitives, but regular FEST does. You can refer to it by its fully qualified name if you want to use it.
This would look like:
org.fest.assertions.api.Assertions.assertThat(myObject.getInt()).isEqualTo(5);
Not necessarily ideal. It's too bad these aren't included in FEST-Android, as I end up either doing this or mixing and matching with JUnit assertions, which I don't love.
You can find the code here.
EDIT: You can actually just import both methods, you don't need to use the fully qualified name.
import static org.fest.assertions.api.Assertions.assertThat;
import static org.fest.assertions.api.ANDROID.assertThat;