我正在验证是否使用Mockito调用了一个函数,但是Mockito告诉我,我正在验证的函数从未被调用,并且其他函数被调用。但在我看来,我正在调用正确的功能......
这是我得到的错误的堆栈跟踪:
Wanted but not invoked:
relationshipAutoIndexer.getAutoIndex();
-> at org.whispercomm.manes.server.graph.DataServiceImplTest.testInitIndices(DataServiceImplTest.java:117)
However, there were other interactions with this mock:
-> at org.whispercomm.manes.server.graph.DataServiceImpl.updateIndexProperties(DataServiceImpl.java:136)
-> at org.whispercomm.manes.server.graph.DataServiceImpl.updateIndexProperties(DataServiceImpl.java:144)
-> at org.whispercomm.manes.server.graph.DataServiceImpl.updateIndexProperties(DataServiceImpl.java:148)
-> at org.whispercomm.manes.server.graph.DataServiceImpl.updateIndexProperties(DataServiceImpl.java:149)
-> at org.whispercomm.manes.server.graph.DataServiceImpl.initIndices(DataServiceImpl.java:121)
at org.whispercomm.manes.server.graph.DataServiceImplTest.testInitIndices(DataServiceImplTest.java:117)
发生在
verify(relAutoIndexer).getAutoIndex();
下面显示的测试类代码。
这是我的代码(我倾向于将事情遗漏。请问我有任何你认为我缺失的代码,我会添加它):
public DataServiceImpl(GraphDatabaseService graphDb) {
super();
this.graphDb = graphDb;
unarchivedParent = new UnarchivedParent(graphDb.createNode());
archivedParent = new ArchivedParent(graphDb.createNode());
packetParent = new PacketParent(graphDb.createNode());
userParent = new UserParent(graphDb.createNode());
this.initIndices();
}
/**
* Initializes the node and relationship indexes.
*
* Updates the set of indexed properties to match {@link DataServiceImpl}
* .NODE_KEYS_INDEXABLE and {@link DataServiceImpl}.REL_KEYS_INDEXABLE.
*
* Note: auto indices can also be configured at database creation time and
* just retrieved at runtime. We might want to switch to that later.
*/
private void initIndices() {
/* Get the auto-indexers */
AutoIndexer<Node> nodeAutoIndexer = this.graphDb.index()
.getNodeAutoIndexer();
AutoIndexer<Relationship> relAutoIndexer = this.graphDb.index()
.getRelationshipAutoIndexer();
this.updateIndexProperties(nodeAutoIndexer,
DataServiceImpl.NODE_KEYS_INDEXABLE);
this.nodeIndex = nodeAutoIndexer.getAutoIndex();
this.updateIndexProperties(relAutoIndexer,
DataServiceImpl.REL_KEYS_INDEXABLE);
this.relIndex = relAutoIndexer.getAutoIndex();
}
/**
* Sets the indexed properties of an {@link AutoIndexer} to the specified
* set, removing old properties and adding new ones.
*
* @param autoIndexer
* the AutoIndexer to update.
* @param properties
* the properties to be indexed.
* @return autoIndexer, this given AutoIndexer (useful for chaining calls.)
*/
private <T extends PropertyContainer> AutoIndexer<T> updateIndexProperties(
AutoIndexer<T> autoIndexer, Set<String> properties) {
Set<String> indexedProps = autoIndexer.getAutoIndexedProperties();
// Remove unneeded properties.
for (String prop : difference(indexedProps, properties)) {
autoIndexer.stopAutoIndexingProperty(prop);
}
// Add new properties.
for (String prop : difference(properties, indexedProps)) {
autoIndexer.startAutoIndexingProperty(prop);
}
// Enable the index, if needed.
if (!autoIndexer.isEnabled()) {
autoIndexer.setEnabled(true);
}
return autoIndexer;
}
这是测试类的代码:
@Before
public void setup() {
nA = mock(Node.class);
nB = mock(Node.class);
packetA = new PacketWrapper(nA);
packetB = new PacketWrapper(nB);
RelA = mock(Relationship.class);
RelB = mock(Relationship.class);
graphDb = mock(GraphDatabaseService.class);
nodeAutoIndexer = (AutoIndexer<Node>) mock(AutoIndexer.class);
relAutoIndexer = mock(RelationshipAutoIndexer.class);
}
@After
public void tearDown() {
packetA = null;
packetB = null;
}
/*
* ---------------- Test initIndices() ---------------
*/
//TODO
@Test
public void testInitIndices() throws IllegalArgumentException, IllegalAccessException, InvocationTargetException, NoSuchMethodException {
IndexManager indexManager = mock(IndexManager.class);
when(graphDb.index()).thenReturn(indexManager);
when(indexManager.getNodeAutoIndexer()).thenReturn(nodeAutoIndexer);
when(graphDb.index().getRelationshipAutoIndexer()).thenReturn(relAutoIndexer);
dataService = new DataServiceImpl(graphDb);
verify(nodeAutoIndexer, atLeastOnce()).getAutoIndex();
verify(relAutoIndexer).getAutoIndex();
}
答案 0 :(得分:25)
Mockito,直到版本1.8.5,在多态调度的情况下有一个错误。它已修复,可在1.9.0版的第一个候选版本中使用。请参阅issue 200。
那么在你的代码库中它是如何发生的。请注意,您正在嘲笑这两个类
nodeAutoIndexer = (AutoIndexer<Node>) mock(AutoIndexer.class);
relAutoIndexer = mock(RelationshipAutoIndexer.class);
AutoIndexer
碰巧是一个通用的父接口,在这个接口中有这个方法ReadableIndex<T> getAutoIndex()
。 RelationshipAutoIndexer
是AutoInexer
的子类型,其中通用部分固定为Relationship
,并覆盖getAutoIndex()
方法以返回协变类型ReadableRelationshipIndex
。
请参阅AutoIndexer和RelationshipIndexer。
好吧,在您的通话代码中,您有以下几行:
AutoIndexer<Node> nodeAutoIndexer = this.graphDb.index().getNodeAutoIndexer();
AutoIndexer<Relationship> relAutoIndexer = this.graphDb.index().getRelationshipAutoIndexer();
this.nodeIndex = nodeAutoIndexer.getAutoIndex();
this.relIndex = relAutoIndexer.getAutoIndex();
生产代码中的nodeAutoIndex
和测试代码中的模拟nodeAutoIndexer
都有AutoIndexer<Node>
类型的引用,因此多态分派没有问题。
但是,生产代码中的relAutoIndex
由类型AutoIndexer<Relationship>
引用,并且测试代码中的模拟relAutoIndexer
由类型RelationshipAutoIndexer
引用,因此错误的调用已在模拟,然后验证失败。
您的解决方案要么升级mockito版本; 1.9.0 RC1非常稳定,最终版本应该是你的方式。 或者您可以从以下网址迁移参考类型(在您的生产代码中)
AutoIndexer<Relationship> relAutoIndexer = this.graphDb.index().getRelationshipAutoIndexer();
到:
RelationshipAutoIndexer relAutoIndexer = this.graphDb.index().getRelationshipAutoIndexer();
其他一些评论。
您实际上不需要在此处编写after方法,因为JUnit会在每个方法运行时创建一个新实例,因此您的方法只会添加将要执行的代码。请注意,这不是TestNG的情况。
您可能希望使用Mockito注释,而不是在before方法中创建模拟。不要忘记跑步者。
例如:
@RunWith(MockitoJUnitRunner.class)
public class YourTest {
@Mock SomeType someTypeMock;
// ...
}
由于几个原因,存根代码有点难看。
为什么不以更清洁的方式写这个;例如,在两种情况下引用indexManager
:
IndexManager indexManager = mock(IndexManager.class);
when(graphDb.index()).thenReturn(indexManager);
when(indexManager.getNodeAutoIndexer()).thenReturn(nodeAutoIndexer);
when(indexManager.getRelationshipAutoIndexer()).thenReturn(relAutoIndexer);
或者根本不参考
IndexManager indexManager = mock(IndexManager.class);
when(graphDb.index()).thenReturn(indexManager);
when(graphDb.index().getNodeAutoIndexer()).thenReturn(nodeAutoIndexer);
when(graphDb.index().getRelationshipAutoIndexer()).thenReturn(relAutoIndexer);
还有一个返回模拟的模拟通常是设计气味的标志。你违反了得墨忒耳的法则,打破它意味着你将经历艰难的测试,糟糕的可维护性和难以进化。当我说你也可以听到我耳语(没有三段论):它会花费你的钱。不要写遗留代码!如果您正在练习TDD或BDD,您将在设计时为自己的代码识别这些问题,这对于防止这些问题非常有用。
使用静态方法你可以写这个
GraphDatabaseService graphdb = mock(GraphDatabaseService.class, RETURNS_DEEP_STUBS);
或者使用注释,你可以这样写:
@Mock(answer = RETURNS_DEEP_STUBS) GraphDatabaseService graphdb;
而且存根:
when(graphDb.index().getNodeAutoIndexer()).thenReturn(nodeAutoIndexer);
when(graphDb.index().getRelationshipAutoIndexer()).thenReturn(relAutoIndexer);