OZG-2626 OZG-3065 adjust description/naming

notification-manager/src/test/java/de/itvsh/kop/notification/user/UserNotificationServiceTest.java

@@ -57,12 +57,12 @@ class UserNotificationServiceTest {
 			}
 		}
 
-		@DisplayName("with valid orgaId")
+		@DisplayName("with null as orgaId")
 		@Nested
-		class TestWithInValidOrgaId {
+		class TestWithInvalidOrgaId {
 
 			@Test
-			void shouldSendEmail() {
+			void shouldThrowIllegalArgumentException() {
 				assertThatThrownBy(() -> service.sendNotification(null))
 						.isInstanceOf(IllegalArgumentException.class)
 						.withFailMessage("organisationsEinheitId cannot be null.");