我正在尝试模拟一个单例类(SessionDataManager),在那里我通过调用静态getInstance()方法获得一个实例,但所有尝试似乎都返回null。
我试过了
@Mocked SessionDataManager sessionDataManager;
或
new MockUp<SessionDataManager>(){
@Mock
public SessionDataManager getInstance(Invocation invocation) {
return invocation.getInvokedInstance();
}
};
我得到相同的结果 = null;
任何人都可以提出解决方案吗?
谢谢
我建议看一下文档,但这里有两个完整的示例测试:
public final class ExampleTest {
public static final class SessionDataManager {
private static final SessionDataManager instance = new SessionDataManager();
public static SessionDataManager getInstance() { return instance; }
public void doSomething() { throw new UnsupportedOperationException("to do"); }
}
@Test
public void mockingASingleton(@Mocked SessionDataManager mockInstance) {
SessionDataManager singletonInstance = SessionDataManager.getInstance();
assertSame(mockInstance, singletonInstance);
singletonInstance.doSomething(); // mocked, won't throw
}
@Test
public void mockingASingletonWithAMockUp() {
new MockUp<SessionDataManager>() {
// no point in having a @Mock getInstance() here
@Mock void doSomething() { /* whatever */ }
};
SessionDataManager singletonInstance = SessionDataManager.getInstance();
singletonInstance.doSomething(); // redirects to the @Mock method, won't throw
}
}
看看期望的类:
new Expectations() {
Singleton singleton;
{
Singleton.getInstance(); returns(singleton);
singleton.valueFromSingleton(); returns(1);
}
};
Entity entity = new Entity();
assertEquals(1, entity.valueFromEntity());