diff --git a/other/fischer_yates_shuffle.py b/other/fischer_yates_shuffle.py
index 5e90b10edd89..bc80e8f789c0 100644
--- a/other/fischer_yates_shuffle.py
+++ b/other/fischer_yates_shuffle.py
@@ -11,6 +11,13 @@
 
 
 def fisher_yates_shuffle(data: list) -> list[Any]:
+    """
+    >>> import random
+    >>> from unittest.mock import patch
+    >>> with patch('random.randint', side_effect=[0, 3, 1, 2, 2, 0, 3, 1]):
+    ...     fisher_yates_shuffle(["python", "says", "hello", "!"])
+    ['says', 'python', '!', 'hello']
+    """
     for _ in range(len(data)):
         a = random.randint(0, len(data) - 1)
         b = random.randint(0, len(data) - 1)
diff --git a/scheduling/multi_level_feedback_queue.py b/scheduling/multi_level_feedback_queue.py
index 58ba2afa0e67..93a0aada4e02 100644
--- a/scheduling/multi_level_feedback_queue.py
+++ b/scheduling/multi_level_feedback_queue.py
@@ -100,7 +100,7 @@ def calculate_completion_time(self, queue: list[Process]) -> list[int]:
         >>> P4 = Process("P4", 0, 24)
         >>> mlfq = MLFQ(3, [17, 25], deque([P1, P2, P3, P4]), 0)
         >>> _ = mlfq.multi_level_feedback_queue()
-        >>> mlfq.calculate_turnaround_time([P1, P2, P3, P4])
+        >>> mlfq.calculate_completion_time([P1, P2, P3, P4])
         [136, 34, 162, 125]
         """
         completion_times = []
diff --git a/strings/min_cost_string_conversion.py b/strings/min_cost_string_conversion.py
index 87eb5189e16a..f4e20e09fd5d 100644
--- a/strings/min_cost_string_conversion.py
+++ b/strings/min_cost_string_conversion.py
@@ -85,6 +85,8 @@ def assemble_transformation(ops: list[list[str]], i: int, j: int) -> list[str]:
     >>> y = len(ops[0]) - 1
     >>> assemble_transformation(ops, x, y)
     ['Cc', 'Rau', 'Ct']
+    >>> assemble_transformation(ops, x, y-1)
+    ['Cc', 'Da', 'Rtu']
 
     >>> ops1 = [['0']]
     >>> x1 = len(ops1) - 1