diff --git a/pom.xml b/pom.xml
index ce4b6c6..24cb7ab 100644
--- a/pom.xml
+++ b/pom.xml
@@ -7,7 +7,7 @@
     <version>1.0-SNAPSHOT</version>
     <name>webssh Maven Webapp</name>
     <url>http://maven.apache.org</url>
-    
+
     <properties>
         <swagger2.version>2.6.1</swagger2.version>
         <spring.version>4.3.6.RELEASE</spring.version>
@@ -27,7 +27,7 @@
     </properties>
 
     <dependencies>
-     
+
         <dependency>
             <groupId>org.freemarker</groupId>
             <artifactId>freemarker</artifactId>
@@ -172,7 +172,7 @@
                 <artifactId>maven-surefire-plugin</artifactId>
                 <version>2.18.1</version>
                 <configuration>
-                    <skipTests>true</skipTests>
+                    <skipTests>false</skipTests>
                 </configuration>
             </plugin>
 
diff --git a/src/main/java/com/educoder/bridge/service/CalculatorService.java b/src/main/java/com/educoder/bridge/service/CalculatorService.java
new file mode 100644
index 0000000..3c89704
--- /dev/null
+++ b/src/main/java/com/educoder/bridge/service/CalculatorService.java
@@ -0,0 +1,36 @@
+package com.educoder.bridge.service;
+
+/**
+ * @Author: youys
+ * @Date: 2023/2/27
+ * @Description:
+ */
+public class CalculatorService {
+
+    public int add(int a, int b) {
+        return a + b;
+    }
+
+    public int subtract(int a, int b) {
+        return a - b;
+    }
+
+    public int multiply(int a, int b) {
+        return a * b;
+    }
+
+    public double divide(double a, double b) {
+        if (b == 0) {
+            throw new IllegalArgumentException("Cannot divide by zero!");
+        }
+        return a / b;
+    }
+
+    public double sqrt(double a) {
+        if (a < 0) {
+            throw new IllegalArgumentException("Cannot calculate square root of negative number!");
+        }
+        return Math.sqrt(a);
+    }
+
+}
diff --git a/src/test/java/com/educoder/bridge/CalculatorServiceTest.java b/src/test/java/com/educoder/bridge/CalculatorServiceTest.java
new file mode 100644
index 0000000..e2e9d4f
--- /dev/null
+++ b/src/test/java/com/educoder/bridge/CalculatorServiceTest.java
@@ -0,0 +1,65 @@
+package com.educoder.bridge;
+
+import com.educoder.bridge.service.CalculatorService;
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.fail;
+
+/**
+ * @Author: youys
+ * @Date: 2023/2/27
+ * @Description:
+ */
+public class CalculatorServiceTest {
+
+    @Test
+    public void testAdd() {
+        CalculatorService calculator = new CalculatorService();
+        int result = calculator.add(1, 2);
+        assertEquals(3, result);
+    }
+
+    @Test
+    public void testSubtract() {
+        CalculatorService calculator = new CalculatorService();
+        int result = calculator.subtract(5, 2);
+        assertEquals(3, result);
+    }
+
+    @Test
+    public void testMultiply() {
+        CalculatorService calculator = new CalculatorService();
+        int result = calculator.multiply(3, 4);
+        assertEquals(12, result);
+    }
+
+    @Test
+    public void testDivide() {
+        CalculatorService calculator = new CalculatorService();
+        double result = calculator.divide(10, 2);
+        assertEquals(5.0, result, 0);
+
+        try {
+            calculator.divide(10, 0);
+            fail("Expected an IllegalArgumentException to be thrown");
+        } catch (IllegalArgumentException e) {
+            assertEquals("Cannot divide by zero!", e.getMessage());
+        }
+    }
+
+    @Test
+    public void testSqrt() {
+        CalculatorService calculator = new CalculatorService();
+        double result = calculator.sqrt(16);
+        assertEquals(4.0, result, 0);
+
+        try {
+            calculator.sqrt(-1);
+            fail("Expected an IllegalArgumentException to be thrown");
+        } catch (IllegalArgumentException e) {
+            assertEquals("Cannot calculate square root of negative number!", e.getMessage());
+        }
+    }
+
+}
diff --git a/src/test/java/com/educoder/bridge/MainTest.java b/src/test/java/com/educoder/bridge/MainTest.java
new file mode 100644
index 0000000..9a07b17
--- /dev/null
+++ b/src/test/java/com/educoder/bridge/MainTest.java
@@ -0,0 +1,26 @@
+package com.educoder.bridge;
+
+import org.junit.Test;
+
+/**
+ * @Author: youys
+ * @Date: 2023/2/27
+ * @Description:
+ */
+public class MainTest {
+
+
+    @Test
+    public void test(){
+        int a = 1;
+        int b = 0;
+        assert b > 0 : String.format("%s/%s, 除数不能为0",a, b);
+    }
+
+    @Test
+    public void test2(){
+        int i=10;
+        assert i > 10 : String.format("变量i=%s,需要大于10", i);
+    }
+
+}