diff --git a/tests/test_main.py b/tests/test_main.py
index d5075fd..2957930 100644
--- a/tests/test_main.py
+++ b/tests/test_main.py
@@ -32,6 +32,9 @@ def test_load_data(load_dataset) :
      else : 
           pytest.fail('Unable to fetch data from remote server')
 
+     # ---- OR ----
+     # assert isinstance(load_dataset, pd.DataFrame), "Failure Message"     # it will raise assertion error 
+
 # test feature generation functionality
 # 'request' is a fixture that provides information about the currently executing test.
 # It allows us to access various attributes and methods to get information about the test
diff --git a/tox.ini b/tox.ini
index ff4a7c1..83219d3 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,7 +1,17 @@
 [tox]                  # global settings
-envlist = py39         # define the list of environment to test against
+envlist = py39, py312        # define the list of environment to test against
 skipsdist = True        # skip creating package
 
 [testenv]
 deps = -rrequirements-tox.txt          # dependency
-commands = pytest tests/     # testcases
+; commands = pytest tests/ --verbose --disable-warnings     # testcases
+
+; we can also execute differet testing files with diff python versions
+[testenv:py39]
+basepython = python3.9
+commands = pytest tests/ --verbose --disable-warnings
+
+[testenv:py312]
+basepython = python3.12
+commands = pytest tests/ --verbose --disable-warnings
+