Try to fix the flaky automation integration test (#5656)

Signed-off-by: Ravi Nadahar <nadahar@rediffmail.com>

Author: Nadahar

itests/org.openhab.core.automation.integration.tests/src/main/java/org/openhab/core/automation/integration/test/AutomationIntegrationTest.java

@@ -14,6 +14,8 @@
 
 import static org.hamcrest.CoreMatchers.*;
 import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.greaterThanOrEqualTo;
+import static org.hamcrest.Matchers.hasSize;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.when;
@@ -162,9 +164,15 @@ public void removeProviderChangeListener(ProviderChangeListener<Item> listener)
             }
         };
 
+        int expectedItemCount = itemProvider.getAll().size();
         registerService(itemProvider);
         registerVolatileStorageService();
 
+        waitForAssert(() -> {
+            ItemRegistry registry = getService(ItemRegistry.class);
+            assertThat(registry.getAll(), hasSize(greaterThanOrEqualTo(expectedItemCount)));
+        }, 5000, 100);
+
         StorageService storageService = getService(StorageService.class);
         ruleRegistry = getService(RuleRegistry.class);
         ruleEngine = getService(RuleManager.class);