first commit

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

@@ -0,0 +1,9 @@
+package com.example;
+
+public class App 
+{
+    public static void main( String[] args )
+    {
+
+    }
+}

src/main/java/com/example/Calculator.java

@@ -0,0 +1,11 @@
+package com.example;
+
+public class Calculator {
+    public int add(int a, int b) {
+        return a + b;
+    }
+
+    public int subtract(int a, int b) {
+        return a - b;
+    }
+}

src/test/java/com/example/CalculatorTest.java

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+package com.example;
+
+import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.*;
+
+class CalculatorTest {
+    @Test
+    void testAdd() {
+        Calculator calculator = new Calculator();
+        assertEquals(5, calculator.add(2, 3));
+    }
+
+    @Test
+    void testSubtract() {
+        Calculator calculator = new Calculator();
+        assertEquals(2, calculator.subtract(5, 3));
+    }
+}