Question

我在模拟EntityManager时遇到问题。一切都编译完毕，测试运行但模拟方法返回null。

当我在嘲笑中设置断点时，找到＆＃39;应用程序永远不会在那里暂停。我设法用这种方式用静态方法成功地模拟了不同的类 - 但是这个我有问题。

我使用Jmockit 1.7和Java 1.8.0。我试图模拟的类是：javax.persistence.EntityManager

如果还需要更多信息，请询问。我会非常感谢任何帮助。

这是我的代码：

@RunWith(JMockit.class)
public class ShapefileSerializerTest {

    @Mocked
    private EntityManager em;

    @BeforeClass
    public static void setUpBeforeClass() throws Exception {
        new MockDatabase();
    }

    @Test
    public void testPrepareShapefile() {
        String[][] data = new String[][] {{"1", "100"}, {"1", "101"}, {"1", "102"}, {"1", "103"}, {"2", "200"}, {"2", "201"}};

        List<Map<String, String>> featuresData = Stream.of(data).map(row -> {
            Map<String, String> map = new HashMap<>(2);
            map.put("layerId", row[0]);
            map.put("id", row[1]);
            return map;
        }).collect(Collectors.toList());

        ShapefileSerializer shapefileSerializer = new ShapefileSerializer("shapefiles");
        // if I do not set up the em here - then it will be null inside the tested class
        Deencapsulation.setField(shapefileSerializer, em);

        Response response = shapefileSerializer.prepareShapefile(featuresData);

        assertEquals(Status.OK.getStatusCode(), response.getStatus());
    } 

    public static final class MockDatabase extends MockUp<EntityManager> {
        @Mock
        @SuppressWarnings("unchecked")
        public <T> T find(Class<T> entityClass, Object primaryKey) {
            return (T) new ProjectLayer();
        }
    }
}

Answer 1

将JMockit升级到1.8或更高版本，并将测试类更改为以下内容：

@RunWith(JMockit.class)
public class ShapefileSerializerTest {
    @Mocked EntityManager em;

    @Test
    public void testPrepareShapefile() {
        String[][] data = ...
        List<Map<String, String>> featuresData = ...

        ShapefileSerializer shapefileSerializer = new ShapefileSerializer("shapefiles");
        Deencapsulation.setField(shapefileSerializer, em);

        new Expectations() {{
            em.find((Class<?>) any, any); result = new ProjectLayer();
        }};

        Response response = shapefileSerializer.prepareShapefile(featuresData);

        assertEquals(Status.OK.getStatusCode(), response.getStatus());
    } 
}

如何使用jmockit＆＃39; Mockups API模拟EntityManager？

1 个答案: