private static Server createServerMock() {
    Server serverMock = mock(Server.class);
    ItemFactory itemFactoryMock = mock(ItemFactory.class);
    when(serverMock.getItemFactory()).thenReturn(itemFactoryMock);
    PluginManager pluginManagerMock = mock(PluginManager.class);
    when(serverMock.getPluginManager()).thenReturn(pluginManagerMock);
    return serverMock;
}