GH-3 - Make tests for DatabaseSchemaInitializer more robust against e…

…xecution order.

The tests previously asserted on no entries being found in the event publication tables. As other tests might have been run before, they could already contain some.

spring-modulith-events/spring-modulith-events-jdbc/src/test/java/org/springframework/modulith/events/jdbc/DatabaseSchemaInitializerIntegrationTests.java

@@ -63,7 +63,7 @@ void doesNotRegisterAnInitializerBean() {
 
 		@Test // GH-3
 		void shouldCreateDatabaseSchemaOnStartUp() {
-			assertThat(operations.queryForObject(COUNT_PUBLICATIONS, Long.class)).isEqualTo(0);
+			assertThatNoException().isThrownBy(() -> operations.queryForObject(COUNT_PUBLICATIONS, Long.class));
 		}
 	}