Question

我有一个程序，我想模拟使用Mockito的数据我的主要计划是AdDataAggregate，并且会调用AdDataConnect AdDataConnect调用API，返回一个解析为JSON并聚合的字符串。

我创建了模拟并返回数据，但主程序没有使用它们有人可以告诉我我的方式的错误。在此先感谢您的帮助。

//Main Program
public class AdDataAggregate {  
public List<AdData> processInfo(long[] adIds){         
    AdDataConnect adDataConnect = new AdDataConnect();         
    List<AdData> adAccumData = new ArrayList<AdData>();             

    for (long adId: adIds) {       
         data = adDataConnect.connectToData(adId);  <———— method  to Mock. 
        }          }
}     


//Test Program
@RunWith(MockitoJUnitRunner.class)     
public class AdDataTest {                  
@InjectMocks            
    private AdDataAggregate adDataAggregate = new AdDataAggregate();         
    @Mock
    private AdDataConnect adDataConnect;             
    private String oneAdId = 
             "[{\"advertiser_id\":\"1\",\"ymd\":\"2015-12-" + 
             "07\",\"num_clicks\":10,\"num_impressions\":100}," +                                       
             "{\"advertiser_id\":\"1\",\"ymd\":\"2015-12-" +
             "06\",\"num_clicks\":20,\"num_impressions\":200}," +     
             "{\"advertiser_id\":\"1\",\"ymd\":\"2015-12-" +
             "05\",\"num_clicks\":30,\"num_impressions\":300}]";  

     @Test    
    public void testWithOneAdId(){          
        MockitoAnnotations.initMocks(this);
        adDataConnect = mock(AdDataConnect.class);
        adDataAggregate = mock(AdDataAggregate.class);
        when(adDataConnect.connectToData(eq(1L))) .thenReturn(oneAdId);    
        String myString = adDataConnect.connectToData(1L);             
        long[] adIds = new long[]{1L};             
        List<AdData> outData = adDataAggregate.processInfo(adIds); 
        Assert.assertEquals(1, outData.size());             
        Assert.assertEquals(myString, oneAdId); 
        Assert.assertEquals(60, outData.get(0).getNumImpressions());             
        Assert.assertEquals(600, outData.get(0).getNumImpressions());              
    }         
}

Answer 1

您需要将AdDataConnect注入AdDataAggregate而不是实例化它。当您从AdDataAggregate中实例化它时，您正在强制使用实现。您需要允许外部人员进行设置，以便您可以在测试中设置模拟版本。

这是你如何做到的。在构造函数中传递AdDataConnect：

public class AdDataAggregate
{
    private AdDataConnect adDataConnect;

    public AdDataAggregate(AdDataConnect adDataConnect)
    {
        this.adDataConnect = adDataConnect;
    }

    public List<AdData> processInfo(long[] adIds)
    {
        List<AdData> adAccumData = new ArrayList<AdData>();
        for(long adId : adIds)
        {
            data = adDataConnect.connectToData(adId);
        }
    }
}

然后在你的测试中做到这一点。您可以在我使用新构造函数的地方看到我的评论：

@RunWith(MockitoJUnitRunner.class)
public class AdDataTest
{
    private AdDataAggregate adDataAggregate;

    @Mock
    private AdDataConnect adDataConnect;

    private String oneAdId = "[{\"advertiser_id\":\"1\",\"ymd\":\"2015-12-"
            + "07\",\"num_clicks\":10,\"num_impressions\":100}," + "{\"advertiser_id\":\"1\",\"ymd\":\"2015-12-"
            + "06\",\"num_clicks\":20,\"num_impressions\":200}," + "{\"advertiser_id\":\"1\",\"ymd\":\"2015-12-"
            + "05\",\"num_clicks\":30,\"num_impressions\":300}]";

    @Test
    public void testWithOneAdId()
    {
        MockitoAnnotations.initMocks(this);
        adDataAggregate = new AdDataAggregate(adDataConnect);//PASS THE MOCK HERE

        when(adDataConnect.connectToData(eq(1L))).thenReturn(oneAdId);
        String myString = adDataConnect.connectToData(1L);
        long[] adIds = new long[] { 1L };
        List<AdData> outData = adDataAggregate.processInfo(adIds);
        Assert.assertEquals(1, outData.size());
        Assert.assertEquals(myString, oneAdId);
        Assert.assertEquals(60, outData.get(0).getNumImpressions());
        Assert.assertEquals(600, outData.get(0).getNumImpressions());
    }
}

我的程序没有使用我的模拟

1 个答案: