标签： android testing android-gradle guava robolectric
Conflict with dependency 'com.google.guava:guava' in project ':app'. Resolved versions for app (19.0) and test app (20.0) differ.
我刚刚将robolectric库添加到我的应用程序：gradle，我在运行测试时遇到上述错误。可能是什么原因？