additional error test

tests/cfdp/pdus/test_file_data.py

@@ -50,7 +50,9 @@ def test_max_file_seg_calculator_error(self):
         file_seg_len = get_max_file_seg_len_for_max_packet_len_and_pdu_cfg(pdu_conf, 11)
         self.assertEqual(file_seg_len, 0)
         with self.assertRaises(ValueError):
-            file_seg_len = get_max_file_seg_len_for_max_packet_len_and_pdu_cfg(pdu_conf, 10)
+            file_seg_len = get_max_file_seg_len_for_max_packet_len_and_pdu_cfg(
+                pdu_conf, 10
+            )
         fd_pdu = FileDataPdu(pdu_conf, FileDataParams(bytes(), 0))
         with self.assertRaises(ValueError):
             fd_pdu.get_max_file_seg_len_for_max_packet_len(10)

tests/cfdp/pdus/test_nak_pdu.py

@@ -130,6 +130,26 @@ def test_segment_req_for_packet_size_large_file_with_crc(self):
         )
         self.assertEqual(nak_pdu.get_max_seg_reqs_for_max_packet_size(90), 4)
 
+    def test_segment_req_for_packet_error(self):
+        pdu_conf = PduConfig.default()
+        nak_pdu = NakPdu(pdu_conf, start_of_scope=0, end_of_scope=0)
+        self.assertEqual(
+            0,
+            get_max_seg_reqs_for_max_packet_size_and_pdu_cfg(
+                max_packet_size=16, pdu_conf=PduConfig.default()
+            ),
+        )
+        self.assertEqual(nak_pdu.get_max_seg_reqs_for_max_packet_size(16), 0)
+        with self.assertRaises(ValueError):
+            self.assertEqual(
+                0,
+                get_max_seg_reqs_for_max_packet_size_and_pdu_cfg(
+                    max_packet_size=15, pdu_conf=PduConfig.default()
+                ),
+            )
+        with self.assertRaises(ValueError):
+            self.assertEqual(nak_pdu.get_max_seg_reqs_for_max_packet_size(15), 0)
+
     def test_packing_0(self):
         nak_packed = self.nak_pdu.pack()
         self.assertEqual(len(nak_packed), 19)