diff --git a/tests/test_cdt.py b/tests/test_cdt.py
index 7c11c7d..bceee9d 100644
--- a/tests/test_cdt.py
+++ b/tests/test_cdt.py
@@ -3,7 +3,7 @@
 
 import unittest
 import pandas as pd
-from mtbp3.util.cdt import diff_2cols_in_1df, diff_2cols_in_2df
+from mtbp3.util import cdt
 
 class TestCdt(unittest.TestCase):
     def setUp(self):
@@ -13,47 +13,45 @@ def setUp(self):
 
     def test_diff_2cols_in_1df_with_difference(self):
         expected_output = pd.DataFrame({'ARM': [3], 'ACTARM': [5], 'diff': ['True']})
-        result = diff_2cols_in_1df(self.df)
+        result = cdt.diff_2cols_in_1df(self.df)
         self.assertTrue(isinstance(result, pd.DataFrame))
         self.assertEqual(len(result), len(self.df))
 
     def test_diff_2cols_in_1df_without_difference(self):
         tmpdf = self.df[['ARM', 'ARM']]
         tmpdf.columns = ['ARM', 'ACTARM']
-        result = diff_2cols_in_1df(tmpdf)
+        result = cdt.diff_2cols_in_1df(tmpdf)
         self.assertTrue(result.empty)
 
     def test_diff_2cols_in_1df_invalid_input(self):
         expected_output = "Input is not a DataFrame."
-        result = diff_2cols_in_1df("not a dataframe")
+        result = cdt.diff_2cols_in_1df("not a dataframe")
         self.assertEqual(result, expected_output)
 
     def test_diff_2cols_in_1df_missing_column(self):
         expected_output = "Column 'COL' does not exist in the DataFrame."
-        result = diff_2cols_in_1df(self.df, col1='COL')
+        result = cdt.diff_2cols_in_1df(self.df, col1='COL')
         self.assertEqual(result, expected_output)
 
     def test_diff_2cols_in_2df_with_existing_column(self):
         expected_output = pd.DataFrame({'gp_1': ['1', '3'], 'gp_2': ['1', '3'], 'source_1': ['True', 'True'], 'source_2': ['True', 'True'], 'count': [1, 2]})
-        result = diff_2cols_in_2df(self.df1, self.df2, 'col', 'gp')
+        result = cdt.diff_2cols_in_2df(self.df1, self.df2, 'col', 'gp')
         self.assertTrue(isinstance(result, pd.DataFrame))
-        # self.assertEqual(result.to_dict(), expected_output.to_dict())
 
     def test_diff_2cols_in_2df_with_non_existing_column(self):
         expected_output = "Column 'non_existing_col' not found in both dataframes."
-        result = diff_2cols_in_2df(self.df1, self.df2, 'non_existing_col', 'gp')
+        result = cdt.diff_2cols_in_2df(self.df1, self.df2, 'non_existing_col', 'gp')
         self.assertEqual(result, expected_output)
 
     def test_diff_2cols_in_2df_with_non_existing_group(self):
         expected_output = "Group 'non_existing_gp' not found in both dataframes."
-        result = diff_2cols_in_2df(self.df1, self.df2, 'col', 'non_existing_gp')
+        result = cdt.diff_2cols_in_2df(self.df1, self.df2, 'col', 'non_existing_gp')
         self.assertEqual(result, expected_output)
 
     def test_diff_2cols_in_2df_with_same_group_and_column(self):
         expected_output = "Columns 'gp' and 'col' should be different columns."
-        result = diff_2cols_in_2df(self.df1, self.df2, 'gp', 'gp')
+        result = cdt.diff_2cols_in_2df(self.df1, self.df2, 'gp', 'gp')
         self.assertEqual(result, expected_output)
 
-
 if __name__ == "__main__":
     unittest.main()
\ No newline at end of file