added benchmarks for cocktail shaker sort

Author: arvinder004

pydatastructs/linear_data_structures/tests/benchmarks/test_algorithms.py

@@ -1,7 +1,7 @@
 import random, timeit, functools, os, pytest
 from pydatastructs import (OneDimensionalArray, Backend,
     DynamicOneDimensionalArray, quick_sort, bubble_sort, selection_sort,
-    insertion_sort, is_ordered, linear_search, binary_search, jump_search)
+    insertion_sort, is_ordered, linear_search, binary_search, jump_search, cocktail_shaker_sort)
 
 def _test_common_sort(sort, **kwargs):
     cpp = Backend.CPP
@@ -52,6 +52,10 @@ def test_insertion_sort():
     _test_common_sort(insertion_sort, size=2000)
 
 
+@pytest.mark.xfail
+def test_cocktail_shaker_sort():
+    _test_common_sort(cocktail_shaker_sort, size=2000)
+
 @pytest.mark.xfail
 def test_is_ordered():
     cpp = Backend.CPP