diff --git a/plio/data/data.db b/plio/data/data.db
index c1ac0e7c5802a4222a93a6ab400dc3dbc454aeb0..09fc46d99adf6d88099df74c72033a853cc3e8eb 100644
Binary files a/plio/data/data.db and b/plio/data/data.db differ
diff --git a/plio/io/isis_serial_number.py b/plio/io/isis_serial_number.py
index 0c187abff1a0ea0fbe70fe3781dca7fc092f035f..01f8fb7d3d0b5256fea5c7c99a21e4de31fecbe6 100644
--- a/plio/io/isis_serial_number.py
+++ b/plio/io/isis_serial_number.py
@@ -82,6 +82,7 @@ def generate_serial_number(label):
 
     # Sort the keys to ensure proper iteration order
     keys = sorted(translation.keys())
+
     for k in keys:
         try:
             group = translation[k]
diff --git a/plio/io/tests/test_isis_serial_numbers.py b/plio/io/tests/test_isis_serial_numbers.py
index 8abf3227fa9f5c98904fbf3348911c58f3d0eeb2..2cd68907e17432dc2a72f9a315102a51e025b76d 100644
--- a/plio/io/tests/test_isis_serial_numbers.py
+++ b/plio/io/tests/test_isis_serial_numbers.py
@@ -1,17 +1,24 @@
 import os
 import sys
-import unittest
 
-from plio.examples import get_path
-
-sys.path.insert(0, os.path.abspath('..'))
+import pytest
 
 from plio.io import isis_serial_number
+from plio.examples import get_path
+
+@pytest.fixture
+def apollo_lbl():
+    return get_path('Test_PVL.lbl')
 
+@pytest.fixture
+def ctx_lbl():
+    return get_path('ctx.pvl')
 
-class TestIsisSerials(unittest.TestCase):
+@pytest.mark.parametrize("label, expected", [(apollo_lbl(), 'APOLLO15/METRIC/1971-07-31T14:02:27.179'),
+                                             (ctx_lbl(),'MRO/CTX/0906095311:038')
+                                             ])
+def test_generate_serial_number(label, expected):
+    serial = isis_serial_number.generate_serial_number(label)
+    assert serial == expected
 
-    def test_generate_serial_number(self):
-        label = get_path('Test_PVL.lbl')
-        serial = isis_serial_number.generate_serial_number(label)
-        self.assertEqual('APOLLO15/METRIC/1971-07-31T14:02:27.179', serial)
\ No newline at end of file
+    
\ No newline at end of file