added wait for history threads

Author: sterlp

core/src/test/java/org/sterl/spring/persistent_tasks/AbstractSpringTest.java

@@ -197,6 +197,9 @@ public void beforeEach() throws Exception {
     public void afterEach() throws Exception {
         schedulerA.shutdownNow();
         schedulerB.shutdownNow();
+
+        awaitHistoryThreads();
+        
         triggerService.deleteAll();
         historyService.deleteAll();
     }

core/src/test/java/org/sterl/spring/persistent_tasks/task/TaskTransactionTest.java

@@ -156,7 +156,10 @@ void testRequiresNewHasOwnTransaction(String task) {
 
         // THEN
         asserts.awaitValue(task + "test");
+        // AND
+        awaitHistoryThreads();
         hibernateAsserts.assertTrxCount(3);
+        // AND
         assertThat(personRepository.count()).isEqualTo(1);
     }