add template for test cases

tests/test_scaler.py

@@ -0,0 +1,14 @@
+# import unittest
+# import os
+
+# os.chdir("../src/")
+# print(os.getcwd())  
+
+# from preprocessing import *
+
+# class TestScaler(unittest.TestCase):
+#     def sample_test(self):
+#         self.assertEqual(1, 1)
+        
+# if __name__ == '__main__':
+#     unittest.main()