diff --git a/codes/csharp/chapter_array_and_linkedlist/Array.cs b/codes/csharp/chapter_array_and_linkedlist/Array.cs
index 8f836a4f1..e454ff696 100644
--- a/codes/csharp/chapter_array_and_linkedlist/Array.cs
+++ b/codes/csharp/chapter_array_and_linkedlist/Array.cs
@@ -1,14 +1,12 @@
-/*
-* File: Array.cs
-* Created Time: 2022-12-14
-* Author: mingXta (1195669834@qq.com)
-*/
- 
+// File: Array.cs
+// Created Time: 2022-12-14
+// Author: mingXta (1195669834@qq.com)
+
 namespace hello_algo.chapter_array_and_linkedlist
 {
     public class Array
     {
-        /* 随机返回一个数组元素 */
+        //随机返回一个数组元素
         public static int RandomAccess(int[] nums)
         {
             Random random = new();
@@ -17,7 +15,7 @@ namespace hello_algo.chapter_array_and_linkedlist
             return randomNum;
         }
 
-        /* 扩展数组长度 */
+        //扩展数组长度
         public static int[] Extend(int[] nums, int enlarge)
         {
             // 初始化一个扩展长度后的数组
@@ -31,7 +29,7 @@ namespace hello_algo.chapter_array_and_linkedlist
             return res;
         }
 
-        /* 在数组的索引 index 处插入元素 num */
+        //在数组的索引 index 处插入元素 num
         public static void Insert(int[] nums, int num, int index)
         {
             // 把索引 index 以及之后的所有元素向后移动一位
@@ -43,7 +41,7 @@ namespace hello_algo.chapter_array_and_linkedlist
             nums[index] = num;
         }
 
-        /* 删除索引 index 处元素 */
+        //删除索引 index 处元素
         public static void Remove(int[] nums, int index)
         {
             // 把索引 index 之后的所有元素向前移动一位
@@ -53,7 +51,7 @@ namespace hello_algo.chapter_array_and_linkedlist
             }
         }
 
-        /* 遍历数组 */
+        //遍历数组
         public static void Traverse(int[] nums)
         {
             int count = 0;
@@ -69,7 +67,7 @@ namespace hello_algo.chapter_array_and_linkedlist
             }
         }
 
-        /* 在数组中查找指定元素 */
+        //在数组中查找指定元素
         public static int Find(int[] nums, int target)
         {
             for (int i = 0; i < nums.Length; i++)
@@ -80,43 +78,10 @@ namespace hello_algo.chapter_array_and_linkedlist
             return -1;
         }
 
-        /*辅助函数,数组转字符串 */
+        //辅助函数,数组转字符串
         public static string ToString(int[] nums)
         {
             return string.Join(",", nums);
         }
-
-        /* Driver Code */
-        public static void Main()
-        {
-            /* 初始化数组 */
-            int[] arr = new int[5];
-            Console.WriteLine("数组 arr = " + ToString(arr));
-            int[] nums = { 1, 3, 2, 5, 4 };
-            Console.WriteLine("数组 nums = " + ToString(nums));
-
-            /* 随机访问 */
-            int randomNum = RandomAccess(nums);
-            Console.WriteLine("在 nums 中获取随机元素 " + randomNum);
-
-            /* 长度扩展 */
-            nums = Extend(nums, 3);
-            Console.WriteLine("将数组长度扩展至 8 ，得到 nums = " + ToString(nums));
-
-            /* 插入元素 */
-            Insert(nums, 6, 3);
-            Console.WriteLine("在索引 3 处插入数字 6 ，得到 nums = " + ToString(nums));
-
-            /* 删除元素 */
-            Remove(nums, 2);
-            Console.WriteLine("删除索引 2 处的元素，得到 nums = " + ToString(nums));
-
-            /* 遍历数组 */
-            Traverse(nums);
-
-            /* 查找元素 */
-            int index = Find(nums, 3);
-            Console.WriteLine("在 nums 中查找元素 3 ，得到索引 = " + index);
-        }
     }
-}
+}
\ No newline at end of file
diff --git a/codes/csharp/test/chapter_array_and_linkedlist/ArrayTest.cs b/codes/csharp/test/chapter_array_and_linkedlist/ArrayTest.cs
new file mode 100644
index 000000000..8bda89513
--- /dev/null
+++ b/codes/csharp/test/chapter_array_and_linkedlist/ArrayTest.cs
@@ -0,0 +1,70 @@
+// File: ArrayTest.cs
+// Created Time: 2022-12-16
+// Author: mingXta (1195669834@qq.com)
+
+using NUnit.Framework;
+using Array = hello_algo.chapter_array_and_linkedlist.Array;
+
+namespace hello_algo.Test.chapter_array_and_linkedlist
+{
+    [TestFixture]
+    internal class ArrayTest
+    {
+        private int[] nums;
+
+        [SetUp]
+        public void setup()
+        {
+            //初始化数组
+            nums = new int[] { 1, 3, 2, 5, 4 };
+        }
+
+        [Test]
+        public void TestRandomAccess()
+        {
+            //随机访问
+            int randomNum = Array.RandomAccess(nums);
+            Console.WriteLine($"在 nums 中获取随机元素 {randomNum}");
+            Assert.Contains(randomNum, nums);
+        }
+
+        [Test]
+        public void TestExtend()
+        {
+            //长度扩展
+            int[] target = { 1, 3, 2, 5, 4, 0, 0, 0 };
+            nums = Array.Extend(nums, 3);
+            Console.WriteLine($"将数组长度扩展至 8 ，得到 nums = {Array.ToString(nums)}");
+            Assert.AreEqual(target, nums);
+        }
+
+        [Test]
+        public void TestInsert()
+        {
+            //插入元素
+            int[] target = { 1, 3, 2, 6, 5 };
+            Array.Insert(nums, 6, 3);
+            Console.WriteLine($"在索引 3 处插入数字 6 ，得到 nums = {Array.ToString(nums)}");
+            Assert.AreEqual(target, nums);
+        }
+
+        [Test]
+        public void TestRemove()
+        {
+            //删除元素
+            int[] target = { 1, 3, 5, 4, 4 };
+            Array.Remove(nums, 2);
+            Console.WriteLine($"删除索引 2 处的元素，得到 nums = {Array.ToString(nums)}");
+            Assert.AreEqual(target, nums);
+        }
+
+        [Test]
+        public void TestFind()
+        {
+            //查找元素
+            int index = Array.Find(nums, 3);
+            Console.WriteLine("在 nums 中查找元素 3 , 得到索引 = " + index);
+            Assert.AreEqual(1, index);
+        }
+    }
+}
\ No newline at end of file