AntiShare mockedAntiShare = PowerMockito.mock(AntiShare.class);
File dataFolder = new File("src" + File.separator + "main" + File.separator + "resources");
when(mockedAntiShare.getDataFolder()).thenReturn(dataFolder);
try{
    Field field = AntiShare.class.getDeclaredField("instance");
    field.setAccessible(true);
    field.set(null, mockedAntiShare);
}catch(SecurityException e){
    e.printStackTrace();
}catch(NoSuchFieldException e){
    e.printStackTrace();
}catch(IllegalArgumentException e){
    e.printStackTrace();
}catch(IllegalAccessException e){
    e.printStackTrace();
}