java - JUnit 测试未捕获异常

Question

更新:这是完整的测试:

@Test(expected = NullPointerException.class)
public void testMissingData() throws Exception{
Resource<ObjectDataModel, Content, Status> resource = builder.build(content,  argA1Response, 
            argA2Response, objFilterParam, argA3Response);}

这是构建方法:

public Resource<ObjectDataModel, Content, Status> build(Content argContent,
        ResponseA1 argA1Response,
        ResponseA2 argA2Response, String argObjectTypeFilter,
        ResponseA3 argA3Response) {

    try {
        viewDataModel.setObjectType(this.buildObjectType(filteredObjectType,
                argA1Response.getData().getDataObject().getCategories().get(0).getObjectTypes().get(0)));

    }
    catch (Exception e) {
        String msg = "Exception occoured while buildng the Object Data Model";
        LOG.error(msg, e);
    }

    // we have the required information gathered to return
    return Resource.okFromDataAndContent(viewDataModel, argContent);
}

这是buildObjectType()方法:

private ObjectType buildObjectType(ObjectTypes argA1ProductType,
        PendingObjectTypes argA2ProductType) {
    ProductType objectType = new ObjectType();
    List<Plan> plans = argA1ObjectType.getPlan();
    List<PendingObjectSummary> objPlans = argA1ObjectType.getData();

    if (objectType.getData() == null) {
        objectType.setData(new ArrayList<>());
    }

    PendingObjectSummary tempPlan = null;
    for (Plan currPlan : plans) {
        tempPlan = plans.stream()
                        .filter(plan -> plan.getObjId().equals(currPlan.getObjId()))
                        .findFirst()
                        .orElseThrow(NullPointerException::new);

    }

    return objectType;
}

我正在使用 Optional 来测试 null，并且我可以确认是否引发了异常 - 但 JUnit 没有捕获它。这是测试用例:

@Test(expected = NullPointerException.class)
public void testMissingData() throws Exception{
    Object<> response = fixture.create();

    assertNotNull(response);
    assertNotNull(response.getData());

    assertNull(resource.getData().getObjectType()); 
}

在我的create方法中，我只是迭代一堆对象来尝试找到一个与我的ID匹配的对象；如果没有找到则抛出 NullPointerException 异常:

for (Object currObj : objects) {
        tempObj = myOtherCollection.stream()
                        .filter(obj -> obj.getId().equals(currObj.getId()))
                        .findFirst()
                        .orElseThrow(NullPointerException::new);
    }

JUnit 输出显然没有捕获异常 - 这是输出:

java.lang.AssertionError: Expected exception: java.lang.NullPointerException

我的 tomcat 日志肯定会在这里抛出异常:

18:48:30.015 [main] ERROR com.myCompany.src.ModelBuilder - Exception occoured while buildng the Data Model
java.lang.NullPointerException: null
at java.util.Optional.orElseThrow(Optional.java:290)

我能看到的唯一问题是，也许我分配的 tempObj 代码是错误的。我错过了什么明显的事情吗？感谢您提供任何有用的提示。

Answer 1

您正在捕获空指针异常，因此该异常不会传播到您的测试。

参见

try {
    viewDataModel.setObjectType(this.buildObjectType(filteredObjectType,
            argA1Response.getData().getDataObject().getCategories().get(0).getObjectTypes().get(0)));

}
catch (Exception e) {
    String msg = "Exception occoured while buildng the Object Data Model";
    LOG.error(msg, e);
}

如果您想测试异常，您可以在错误处理中抛出异常(例如自定义 ObjectCreationExcepion)并断言该异常已抛出，例如

try {
    viewDataModel.setObjectType(this.buildObjectType(filteredObjectType,
            argA1Response.getData().getDataObject().getCategories().get(0).getObjectTypes().get(0)));

}
catch (Exception e) {
    String msg = "Exception occoured while buildng the Object Data Model";
    LOG.error(msg, e);
    throw new ObjectCreationException(msg);
}

在你的测试中

@Test(expected = ObjectCreationException.class) 
public void testMissingData() throws Exception{
    Object<> response = fixture.create();  
}

@Test(expected = ObjectCreationException.class) 仅处理被测试代码或测试本身未处理的异常。