带有特定构造函数的JMockit @Tested字段

Question

我试图用JMockit 1.45模拟一个类。由于删除了Deencapsulation.setField方法，我无法设置私有字段值。所以我正在寻找一种方法来在启动类时设置私有字段值。我添加了一个额外的构造函数来设置私有字段值。但是，我找不到一种方法来获得一个带有特殊构造函数的@Tested注释的自制实例。还有其他办法吗？

应该通过Configuration设置“long maxSizeByte”，我需要测试该方法是否在各种值中工作。

代码示例生产类

public class MagazineFetcher {  

    @EJB private StatisticDAO statisticDao;

    // configs
    private long maxSizeByte;

    public MagazineFetcher() {
        this(ProjectConfig.getCdsMaxChannelSizeByte());
    }
    // This constructor is adde for a testcase to set the private value
    public MagazineFetcher(long maxSizeByte) {
        this.maxSizeByte = maxSizeByte;
    }

    // using maxSizeByte field for a calcuation and validation      
    public void doSomething(){
    }
}

测试用例

public class MagazineFetcherTest {
    @Injectable private StatisticDAO statisticDao;

    @Tested private MagazineFetcher magazineFetcher ;

    @Test
    public void testInvalidImportFile() throws Exception {

        magazineFetcher.doSomething();
    }
}

似乎@Tested private MagazineFetcher magazineFetcher仅由Default Constructor实例化。我正在寻找由另一个构造函数启动的方法。当我只是MagazineFetcher magazineFetcher = new MagazineFetcher(100 * 1024)然后我得到一个不注入statisticDao的实例。

Answer 1

我不想更改运行JMockit测试用例的任何生产代码。但我必须添加一个方法来模拟它。我希望得到任何更好的主意。

public class MagazineFetcher {  

    @EJB private StatisticDAO statisticDao;

    // configs
    private long maxSizeByte;

    // Method is added only for Testcase
    long getMaxSizeByte() { return maxSizeByte;  }

    public MagazineFetcher() {
        maxSizeByte = ProjectConfig.getCdsMaxChannelSizeByte();
    }
    // No need to add a constructor
    // public MagazineFetcher(long maxSizeByte) {
    //  this.maxSizeByte = maxSizeByte;
    // }

    public void doSomething(){
        // using maxSizeByte field is replaced by getMaxSizeByte() 
        if ( ... < getMaxSizeByte() ) 
            ....
    }
}

测试用例

public class MagazineFetcherTest {
    @Injectable private StatisticDAO statisticDao;

    @Tested private MagazineFetcher magazineFetcher ;

    @Test
    public void testInvalidImportFile() throws Exception {

        new MockUp<MagazineFetcher>(){
            @Mock
            long getMaxSizeByte() {
                return 1024 * 1024 * 250;
            }
        };

        magazineFetcher.doSomething();
    }
}