diff --git a/JJL.c b/JJL.c
index a26b925..82865e4 100644
--- a/JJL.c
+++ b/JJL.c
@@ -5,6 +5,11 @@ int add(int a,int b)
     return a + b;
 }
 
+int sub(int a,int b)
+{
+    return a-b;
+}
+
 int main()
 {
     printf("hello world!");
diff --git a/UnitTest1.cpp b/UnitTest1.cpp
new file mode 100644
index 0000000..ea56c80
--- /dev/null
+++ b/UnitTest1.cpp
@@ -0,0 +1,57 @@
+#include "pch.h"
+#include "CppUnitTest.h"
+#include "test.h"
+#include <assert.h>
+#include <chrono>
+#include <ctime>
+#include <cstdlib>
+using namespace Microsoft::VisualStudio::CppUnitTestFramework;
+
+void GenerateRandomArray(vector<int>& a,int sum)
+{
+	srand(time(0)); // 使用当前时间作为种子
+	for (int i = 0; i < sum; i++) {
+		a.push_back(i);
+	}
+}
+
+
+namespace UnitTest1
+{
+	TEST_CLASS(UnitTest1)
+	{
+	public:
+		
+		TEST_METHOD(TestMethod1)
+		{
+			vector<int> arr = { 5,8,4,3,9,1 };
+			const vector<int> expect = { 1,3,4,5,8,9 };
+			selectionSort(arr);
+			for(int i= 0;i < arr.size();i++)
+			{
+				Assert::AreEqual(expect.at(i), arr.at(i));
+			}
+		}
+		TEST_METHOD(TestEmptyArr)
+		{
+			vector<int> arr = {};
+			selectionSort(arr);
+			Assert::IsTrue(true);
+			
+		}
+		BEGIN_TEST_METHOD_ATTRIBUTE(TestRunTime)
+			TEST_METHOD_ATTRIBUTE(L"RUN","TIME")
+		END_TEST_METHOD_ATTRIBUTE(TestRunTime)
+		TEST_METHOD(TestRunTime)
+		{
+			vector<int> arr;
+			GenerateRandomArray(arr, 10000); // 生成随机数组
+			auto start = std::chrono::high_resolution_clock::now();
+			selectionSort(arr);
+			auto end = std::chrono::high_resolution_clock::now();
+			auto duration = std::chrono::duration_cast<std::chrono::milliseconds>(end - start);
+			Logger::WriteMessage(("Time: " + std::to_string(duration.count()) + "ms").c_str());
+			Assert::IsTrue(duration.count() < 10000); // 设定阈值
+		}
+	};
+}