我已经编写了一个线程池，但无法为该类编写 Junits(PowerMock)。
public enum ThreadPool {
INSTANCE;
private static final String THREAD_POOL_SIZE = "threadpool.objectlevel.size";
private static TPropertyReader PROP_READER = new PropertyReader();
private final ExecutorService executorService;
private static final ILogger LOGGER = LoggerFactory
.getLogger(ReportExecutorObjectLevelThreadPool.class.getName());
ThreadPool() {
loadProperties();
int no_of_threads = getThreadPoolSize();
executorService = Executors.newFixedThreadPool(no_of_threads);
}
public void submitTask(Runnable task) {
executorService.execute(task);
}
private static void loadProperties() {
try {
PROP_READER.loadProperties("Dummy");
} catch (final OODSystemException e) {
LOGGER.severe("Loading properties for app failed!");
}
}
private int getThreadPoolSize() {
return Integer.valueOf(PROP_READER
.getProperty(THREAD_POOL_SIZE));
}
}
在模拟此类时，我在 PROP_READER.loadProperties("DUMMY");
行中收到 NullPointerException我的测试用例是:-
PowerMockito.whenNew(PropertyReader.class).withNoArguments().thenReturn(mockPropertyReader);
PowerMockito.doNothing().when( mockPropertyReader,"loadProperties",anyString());
mockStatic(ThreadPool.class);
最佳答案
首先，您需要设置枚举的内部状态，因为枚举是最终类 并且枚举的实例将在类加载时加载
ThreadPool mockInstance = mock(ThreadPool .class);
Whitebox.setInternalState(ThreadPool.class, "INSTANCE", mockInstance);
然后
PowerMockito.mockStatic(ThreadPool .class);
然后 mock
doNothing().when(mockInstance).loadProperties(any(String.class));
不要忘记在测试中添加以下注释
@RunWith(PowerMockRunner.class)
@PrepareForTest({ThreadPool.class})
如果它仍然不起作用，您需要查看需要在内部状态中设置类的哪些成员
关于java - 使用 PowerMock 模拟枚举时静态字段为 Null，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/30276989/