plz

src/main/java/com/example/App.java

@@ -0,0 +1,12 @@
+package com.example;
+
+public class App {
+    public static int add(int a, int b) { return a + b; }
+    public static int sub(int a, int b) { return a - b; }
+    public static int mul(int a, int b) { return a * b; }
+
+    public static void main(String[] args) {
+        System.out.println("CI ready");
+        System.out.println("2 + 3 = " + add(2, 3));
+    }
+}

src/test/java/com/example/AppTest.java

@@ -0,0 +1,10 @@
+package com.example;
+
+import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.*;
+
+class AppTest {
+    @Test void testAdd() { assertEquals(5, App.add(2, 3)); }
+    @Test void testSub() { assertEquals(1, App.sub(3, 2)); }
+    @Test void testMul() { assertEquals(6, App.mul(2, 3)); }
+}