[英]Catch Java exception from Runnable in Unit test
我有以下代碼
public final class JoinableTaskPool<T> extends ABC {
private int taskCounter;
private final Object monitor;
private final ExtendedThreadPoolExecutor service;
private final CompletionService<T> compService;
public Future<T> submit(final Callable<T> task) {
final Future<T> result = compService.submit(task);
service.submit(new Runnable() {
public void run() {
try {
final Future<T> result = compService.take();
try {
handler.processResult(result);
} catch (final Throwable t) {
throw new SearchException("Task has an error", t);
}
} catch (InterruptedException e) {
throw new SearchException("Task has an error", e);
}
}
}
return result;
}
public void join() {
synchronized (monitor) {
while (taskCounter != 0) {
try {
monitor.wait();
} catch (InterruptedException e) {
error(e, "Interrupted in join");
}
}
}
}
ExtendedThreadPoolExecutor class 定義如下
public class ExtendedThreadPoolExecutor extends ThreadPoolExecutor {
public ExtendedThreadPoolExecutor(int corePoolSize, int maximumPoolSize, long keepAliveTime, TimeUnit unit, BlockingQueue<Runnable> workQueue, ThreadFactory threadFactory) {
super(corePoolSize, maximumPoolSize, keepAliveTime, unit, workQueue, threadFactory);
}
@Override
protected void afterExecute(Runnable r, Throwable t) {
super.afterExecute(r, t);
if(t != null) {
throw new SearchException("Error while executing the task", t);
}
}
}
我正在嘗試為此方法編寫單元測試。 下面是方法
@RunWith(MockitoJUnitRunner.class)
public class TestJoinableTaskPool<T> {
private JoinableTaskPool<T> pool;
@Before
public void setUp() {
pool = new JoinableTaskPool<T>(1);
}
@After
public void tearDown() {
pool.shutdown();
}
@Test (expected = SearchException.class)
public void testSubmit() throws Exception{
Callable task = (Callable<T>) () -> null;
Mockito.when(pool.getFinishHandler().processResult(result))
.thenThrow(RuntimeException.class);
pool.submit(task);
}
}
由於在runnable中拋出了SearchException異常,所以沒有辦法在submit方法之外訪問它。 如果我會返回由executorService.submit
返回的 Future,我可以執行 future.get() 來獲取異常,但我會返回另一個未來( result
變量)。 因此,在編寫單元測試時,我無法拋出異常。
我還重寫了 afterExecute() 以從單元測試中捕獲異常,但找不到調用它的方法。
如何測試從單元測試的可運行對象拋出的異常。 任何幫助,將不勝感激。
撇開他的代碼聞起來一英里遠,你可以做的是創建額外的接口,例如
public interface MyErrorHandler { handleError(Exception e)
在您的執行程序池中實現它並在異常時調用它。 然后您可以使用Mockito.spy
來查看是否在MyErrorHandler
上調用了該方法(cglib 應該允許您這樣做,即使沒有額外的接口。)
或者,您可以定義應將MyExceptionHandler
實例傳遞給執行程序(通過構造函數或設置器),以便您能夠提供此類回調的用例依賴實現
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