Challenge Not yet complete... here's what's wrong:
Ensure that after you clear test data, you run your tests once and the required test coverage is achieved.
here is my code for AnnouncementQueueable covage 58 % for this:-


AnnouncementQueueable:
/**
 * @name AnnouncementQueueable
 * @description This class posts Chatter Announcements
**/
public class AnnouncementQueueable implements Queueable{

public List<ConnectApi.AnnouncementInput> toPost;

    //ToDo: Modify this class to implement the Queueable interface and call the postAnnouncements method

    public void execute(QueueableContext context) {
        PostAnnouncements(toPost);
    }
    
    /**
     * @name postAnnouncements
     * @description This method is provided for you to facilitate the Super Badge
    **/
    public static void PostAnnouncements(List<ConnectApi.AnnouncementInput> announcements){
        while ( announcements.size() > 0 ){
            if ( Limits.getDMLStatements() < Limits.getLimitDMLStatements() && !test.isRunningTest() ){
                ConnectApi.AnnouncementInput a = announcements.remove(0);
                ConnectApi.Announcements.postAnnouncement('Internal', a);
            } else {
                break;
            }
        }
        if ( announcements.size() > 0 && !test.isRunningTest() ){
            AnnouncementQueueable q = new AnnouncementQueueable();
            q.toPost = announcements;

            //ToDo: Enqueue the above instance of announcementQueueable
            System.enqueueJob(q);
            
        }
    }
}