JUnit测试java方法，测试没有返回类型的方法是正常的，还是应该对它们使用不同类型的测试？

Question

谢谢

  public GamePlay(int decade)
    {
        this();
        questions = null;
        if(decade== 1960)
        {
            questions = Questions.QuestionSetFrom60s();


        }
        else if(decade== 1970)
        {
            questions = Questions.QuestionSetFrom70s();

        }
        else if(decade== 1980)
        {
            questions = Questions.QuestionSetFrom80s();

        }
        else if(decade== 1990)
        {
            questions = Questions.QuestionSetFrom90s();

        }
        else if(decade== 2000)
        {
            questions = Questions.QuestionSetFrom2000s();

        }
        else if(decade== 2010)
        {
            questions = Questions.QuestionSetFrom2010s();

        }
        ImageIcon pic = new ImageIcon(questions[questionIndex].mediaFilePath);
        lblMediaPlayer.setIcon(pic);

        questionIndex = 0;

        lblDisplayQuestion.setText(questions[questionIndex].textQuestion);
    }

我补充说，这是试图解释我从哪里得到的问题

public class Questions 
{

    public static boolean AccountCreation(String userName, String password)
    {

        return true;
    }
    /**
     * method to return array of questions from chosen decade
     * @return
     */
    public static QuestionObject[] QuestionSetFrom60s()
    {
        QuestionObject pictureQuestion = new QuestionObject();
        pictureQuestion.textQuestion = "Name This Character";
        pictureQuestion.dataType =  0;
        pictureQuestion.rightAnswer = "charlie brown";
        pictureQuestion.mediaFilePath = "Charlie Brown.jpg";

        QuestionObject themeTuneQuestion = new QuestionObject();
        themeTuneQuestion.textQuestion = "Name This Theme Tune";
        themeTuneQuestion.dataType =  1;
        themeTuneQuestion.rightAnswer = "the waltons";
        themeTuneQuestion.mediaFilePath = "the waltons.wav";

        QuestionObject videoQuestion = new QuestionObject();
        videoQuestion.textQuestion = "Who had a hit with the song ? Are You Lonesome Tonight";
        videoQuestion.dataType =  2;
        videoQuestion.rightAnswer = "elvis presley";
        videoQuestion.mediaFilePath = "";

        QuestionObject questionArray [] = {pictureQuestion,themeTuneQuestion,videoQuestion};

        return questionArray;
    }
    /**
     * method to return array of questions from chosen decade
     * @return
     */
    public static QuestionObject[] QuestionSetFrom70s()
    {
        QuestionObject pictureQuestion = new QuestionObject();
        pictureQuestion.textQuestion = "Name This Character";
        pictureQuestion.dataType =  0;
        pictureQuestion.rightAnswer = "worzal gummidge";
        pictureQuestion.mediaFilePath = "worzal gummidge.jpg";

        QuestionObject themeTuneQuestion = new QuestionObject();
        themeTuneQuestion.textQuestion = "Name This Theme Tune";
        themeTuneQuestion.dataType =  1;
        themeTuneQuestion.rightAnswer = "black beauty";
        themeTuneQuestion.mediaFilePath = "the adventure of black beauty.wav";

        QuestionObject textQuestion = new QuestionObject();
        textQuestion.textQuestion = "Which Group Performed The Song SOS";
        textQuestion.dataType =  2;
        textQuestion.rightAnswer = "abba";
        textQuestion.mediaFilePath = "";

        QuestionObject questionArray [] = {pictureQuestion,themeTuneQuestion,textQuestion};

        return questionArray;
    }
    /**
     * method to return array of questions from chosen decade
     * @return
     */
    public static QuestionObject[] QuestionSetFrom80s()
    {
        QuestionObject pictureQuestion = new QuestionObject();
        pictureQuestion.textQuestion = "Name This Character";
        pictureQuestion.dataType =  0;
        pictureQuestion.rightAnswer = "falcor";
        pictureQuestion.mediaFilePath = "Falcor.jpg";

        QuestionObject themeTuneQuestion = new QuestionObject();
        themeTuneQuestion.textQuestion = "Name This Theme Tune";
        themeTuneQuestion.dataType =  1;
        themeTuneQuestion.rightAnswer = "et";
        themeTuneQuestion.mediaFilePath = "ET.wav";

        QuestionObject videoQuestion = new QuestionObject();
        videoQuestion.textQuestion = "Who had the hit Beat It in 1982";
        videoQuestion.dataType =  2;
        videoQuestion.rightAnswer = "michael jackson";
        videoQuestion.mediaFilePath = "";

        QuestionObject questionArray [] = {pictureQuestion,themeTuneQuestion,videoQuestion};

        return questionArray;
    }
    /**
     * method to return array of questions from chosen decade
     * @return
     */
    public static QuestionObject[] QuestionSetFrom90s()
    {

        QuestionObject pictureQuestion = new QuestionObject();
        pictureQuestion.textQuestion = "Name This Character";
        pictureQuestion.dataType =  0;
        pictureQuestion.rightAnswer = "tommy pickles";
        pictureQuestion.mediaFilePath = "tommy pickles.jpg";

        QuestionObject themeTuneQuestion = new QuestionObject();
        themeTuneQuestion.textQuestion = "Name This Theme Tune";
        themeTuneQuestion.dataType =  1;
        themeTuneQuestion.rightAnswer = "the crystal maze";
        themeTuneQuestion.mediaFilePath = "the crystal maze.wav";

        QuestionObject videoQuestion = new QuestionObject();
        videoQuestion.textQuestion = "Which 90's Sitcom Featured 6 Friends That Sat Around In A Coffee Shop?";
        videoQuestion.dataType =  2;
        videoQuestion.rightAnswer = "friends";
        videoQuestion.mediaFilePath = "";


        QuestionObject questionArray [] = {pictureQuestion,themeTuneQuestion,videoQuestion};

        return questionArray;
    }
    /**
     * method to return array of questions from chosen decade
     * @return
     */
    public static QuestionObject[] QuestionSetFrom2000s()
    {


        QuestionObject pictureQuestion = new QuestionObject();
        pictureQuestion.textQuestion = "Name This Character";
        pictureQuestion.dataType =  0;
        pictureQuestion.rightAnswer = "walter white";
        pictureQuestion.mediaFilePath = "walt.jpg";

        QuestionObject themeTuneQuestion = new QuestionObject();
        themeTuneQuestion.textQuestion = "Name This Theme Tune";
        themeTuneQuestion.dataType =  1;
        themeTuneQuestion.rightAnswer = "two and a half men";
        themeTuneQuestion.mediaFilePath = "two.wav";

        QuestionObject videoQuestion = new QuestionObject();
        videoQuestion.textQuestion = "What is the main character of the sopranos";
        videoQuestion.dataType =  2;
        videoQuestion.rightAnswer = "tony";
        videoQuestion.mediaFilePath = "";

        QuestionObject questionArray [] = {pictureQuestion,themeTuneQuestion,videoQuestion};

        return questionArray;
    }
    /**
     * method to return array of questions from chosen decade
     * @return
     */
    public static QuestionObject[] QuestionSetFrom2010s()
    {


        QuestionObject pictureQuestion = new QuestionObject();
        pictureQuestion.textQuestion = "Name This Character";
        pictureQuestion.dataType =  0;
        pictureQuestion.rightAnswer = "elsa";
        pictureQuestion.mediaFilePath = "frozen.jpg";

        QuestionObject themeTuneQuestion = new QuestionObject();
        themeTuneQuestion.textQuestion = "Name This Theme Tune";
        themeTuneQuestion.dataType =  1;
        themeTuneQuestion.rightAnswer = "game of thrones";
        themeTuneQuestion.mediaFilePath = "Game.wav";

        QuestionObject textQuestion = new QuestionObject();
        textQuestion.textQuestion = "Who starred in the 2013 version of house of cards";
        textQuestion.dataType =  2;
        textQuestion.rightAnswer = "kevin spacey";
        textQuestion.mediaFilePath = "";

        QuestionObject questionArray [] = {pictureQuestion,themeTuneQuestion,textQuestion};

        return questionArray;
    }

}//end of class

Answer 1

要测试某些代码，首先需要使其具有可测试性。您听说过测试驱动删除(TDD)吗？

在您提供的示例中，您可能无法修改代码。如果您可以将选择问题集的逻辑提取到一个单独的方法中，并将其作为返回值的方法进行测试。

如果您不能修改代码，我认为您应该能够查询GamePlay类实例的“Questions”字段。我希望您有类似于getQuestions方法或者字段本身是public/protected/default--因此junit测试用例可以访问。