diff --git a/test/erroneous_code_test.py b/test/erroneous_code_test.py
new file mode 100644
index 0000000..fd38eb2
--- /dev/null
+++ b/test/erroneous_code_test.py
@@ -0,0 +1,87 @@
+import time
+import random
+
+def calculate_factorial(n):
+    if n == 0:
+        return 1
+    else:
+        return n * calculate_factorial(n - 1)
+
+def find_largest_number(numbers):
+    largest = numbers[0]
+    for num in numbers:
+        if num > largest:
+            largest = num
+    return largest
+
+def inefficient_sort(arr):
+    n = len(arr)
+    for i in range(n):
+        for j in range(0, n-i-1):
+            if arr[j] > arr[j+1]:
+                arr[j], arr[j+1] = arr[j+1], arr[j]
+    return arr
+
+class User:
+    def __init__(self, name, age):
+        self.name = name
+        self.age = age
+    
+    def print_user_info(self):
+        print(f"Name: {self.name}, Age: {self.age}")
+
+def process_data(data):
+    result = []
+    for item in data:
+        if item % 2 == 0:
+            result.append(item * 2)
+        else:
+            result.append(item * 3)
+    return result
+
+def generate_random_numbers(n):
+    numbers = []
+    for i in range(n):
+        numbers.append(random.randint(1, 100))
+    return numbers
+
+def calculate_average(numbers):
+    total = sum(numbers)
+    count = len(numbers)
+    average = total / count
+    return average
+
+def main():
+    # Inefficient factorial calculation
+    print(calculate_factorial(20))
+
+    # Unnecessary loop for finding largest number
+    numbers = [3, 7, 2, 9, 1, 5]
+    print(find_largest_number(numbers))
+
+    # Inefficient sorting algorithm
+    unsorted_list = [64, 34, 25, 12, 22, 11, 90]
+    print(inefficient_sort(unsorted_list))
+
+    # Inconsistent naming convention
+    user1 = User("John Doe", 30)
+    user1.print_user_info()
+
+    # Redundant if-else structure
+    data = [1, 2, 3, 4, 5]
+    print(process_data(data))
+
+    # Inefficient random number generation
+    random_numbers = generate_random_numbers(1000000)
+    print(f"Generated {len(random_numbers)} random numbers")
+
+    # Potential division by zero
+    empty_list = []
+    print(calculate_average(empty_list))
+
+    # Unnecessary time delay
+    time.sleep(5)
+    print("Finished processing after 5 seconds")
+
+if __name__ == "__main__":
+    main()