change assertEquals to asserEqual due to deprecation

src/tests/test_io/test_data_container/test_data_container.py

@@ -1250,7 +1250,7 @@ class TestDataContainer(unittest.TestCase):
         result = DataContainer.from_csv(filename)
         self.assertIsInstance(result, DataContainer)
         self.assertIsInstance(result.header, dict)
-        self.assertEquals(result.__repr__(), data.__repr__())
+        self.assertEqual(result.__repr__(), data.__repr__())
 
     def test_json(self):
         filename = f"{datadir}/TestCSV.csv"
@@ -1268,7 +1268,7 @@ class TestDataContainer(unittest.TestCase):
         result = DataContainer.from_json(filename)
         self.assertIsInstance(result, DataContainer)
         self.assertIsInstance(result.header, dict)
-        self.assertEquals(result.values.__repr__(), data.values.__repr__())
+        self.assertEqual(result.values.__repr__(), data.values.__repr__())
 
     def test_combine_header(self):
         self.base.header["Info"] = ("Test1", 4, "Test2")