fix concurrency in tests

Author: guFalcon

src/test/java/info/unterrainer/commons/rdbutils/ManualLockingTests.java

@@ -42,8 +42,9 @@ public void persistingAndReadingEntityWorks() throws InterruptedException {
 					.editedOn(LocalDateTime.now())
 					.build());
 
-		ExecutorService executorService = new ThreadPoolExecutor(1, 200, 0L, TimeUnit.MILLISECONDS,
+		ExecutorService executorService = new ThreadPoolExecutor(200, 200, 100L, TimeUnit.MILLISECONDS,
 				new LinkedBlockingQueue<Runnable>());
+		((ThreadPoolExecutor) executorService).allowCoreThreadTimeOut(true);
 		executorService.execute(() -> selectFirstTestEntityPessimistically());
 		executorService.execute(() -> selectFirstTestEntityPessimistically());
 		executorService.shutdown();