modified test file

Author: arvinder004

pydatastructs/trees/fenwich_tree.py

@@ -1,3 +1,7 @@
+__all__ = [
+    'fenwich_tree'
+]
+
 class fenwich_tree:
     """
     Implementation of Fenwich tree/Binary Indexed Tree

pydatastructs/trees/tests/test_fenwich_tree.py

@@ -1,5 +1,5 @@
 import unittest
-from pydatastructs import fenwich_tree
+from pydatastructs.trees.fenwich_tree import fenwich_tree
 
 class TestFenwickTree(unittest.TestCase):
 

pydatastructs/utils/misc_util.py

@@ -623,3 +623,5 @@ def summation(x_y):
         return x if y is None else y
 
     return x + y
+
+