OZG-5321 [test] add missing tests

bescheid-manager/src/test/java/de/ozgcloud/bescheid/attacheditem/AttachedItemServiceTest.java

@@ -88,6 +88,27 @@ class AttachedItemServiceTest {
 		}
 	}
 
+	@Nested
+	class TestGetBescheidItem {
+
+		@Test
+		void shouldCallGetBescheid() {
+			service.getBescheidItem(BescheidItemTestFactory.ID);
+
+			verify(remoteService).getBescheid(BescheidItemTestFactory.ID);
+		}
+
+		@Test
+		void shouldReturnBescheidItem() {
+			var expected = BescheidItemTestFactory.create();
+			when(remoteService.getBescheid(anyString())).thenReturn(expected);
+
+			var actual = service.getBescheidItem(BescheidItemTestFactory.ID);
+
+			assertThat(actual).isEqualTo(expected);
+		}
+	}
+
 	@Nested
 	class TestCreateBescheidDraft {