From 0d6e3eeb64dae90f603019e364dab5e2a52ab01b Mon Sep 17 00:00:00 2001
From: kdongd <kimdongd2@naver.com>
Date: Thu, 23 Oct 2025 09:19:01 +0900
Subject: [PATCH 1/2] =?UTF-8?q?step1:=20=EB=AF=B8=EC=85=98=20=EA=B5=AC?=
 =?UTF-8?q?=ED=98=84=20=EC=99=84=EB=A3=8C?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 src/main/java/study2/Calculator.java    | 21 +++++++++++++++++++++
 src/test/java/study/CalculatorMain.java | 15 +++++++++++++++
 2 files changed, 36 insertions(+)
 create mode 100644 src/main/java/study2/Calculator.java
 create mode 100644 src/test/java/study/CalculatorMain.java

diff --git a/src/main/java/study2/Calculator.java b/src/main/java/study2/Calculator.java
new file mode 100644
index 000000000..558cdf319
--- /dev/null
+++ b/src/main/java/study2/Calculator.java
@@ -0,0 +1,21 @@
+package study2;
+
+public class Calculator {
+
+    public void add(int a, int b) {
+        System.out.println("더하기 연산 a + b = " + (a + b));
+    }
+
+    public void subtraction(int a, int b) {
+        System.out.println("빼기 연산 a - b = " + (a - b));
+    }
+
+    public void multiplication(int a, int b) {
+        System.out.println("곱하기 연산 a * b = " + (a * b));
+    }
+
+    public void division(int a, int b) {
+        System.out.println("나누기 연산 a / b = " + (a / b));
+    }
+
+}
diff --git a/src/test/java/study/CalculatorMain.java b/src/test/java/study/CalculatorMain.java
new file mode 100644
index 000000000..e4a71a953
--- /dev/null
+++ b/src/test/java/study/CalculatorMain.java
@@ -0,0 +1,15 @@
+package study;
+
+import study2.Calculator;
+
+public class CalculatorMain {
+
+    public static void main(String[] args) {
+        Calculator cal = new Calculator();
+        cal.add(3,4);
+        cal.subtraction(5,2);
+        cal.multiplication(4,6);
+        cal.division(8,4);
+    }
+
+}

From 059cdacb8e98118d523fb45b18c656a655dfbd33 Mon Sep 17 00:00:00 2001
From: kdongd <kimdongd2@naver.com>
Date: Wed, 29 Oct 2025 16:15:06 +0900
Subject: [PATCH 2/2] =?UTF-8?q?JUnit5=20=ED=85=8C=EC=8A=A4=ED=8A=B8=20?=
 =?UTF-8?q?=EC=BD=94=EB=93=9C?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 src/main/java/study2/Calculator.java        | 16 +++++------
 src/test/java/study/CalculatorMainTest.java | 32 +++++++++++++++++++++
 2 files changed, 40 insertions(+), 8 deletions(-)
 create mode 100644 src/test/java/study/CalculatorMainTest.java

diff --git a/src/main/java/study2/Calculator.java b/src/main/java/study2/Calculator.java
index 558cdf319..6ce5dd037 100644
--- a/src/main/java/study2/Calculator.java
+++ b/src/main/java/study2/Calculator.java
@@ -2,20 +2,20 @@
 
 public class Calculator {
 
-    public void add(int a, int b) {
-        System.out.println("더하기 연산 a + b = " + (a + b));
+    public int add(int a, int b) {
+        return a + b;
     }
 
-    public void subtraction(int a, int b) {
-        System.out.println("빼기 연산 a - b = " + (a - b));
+    public int subtraction(int a, int b) {
+        return a - b;
     }
 
-    public void multiplication(int a, int b) {
-        System.out.println("곱하기 연산 a * b = " + (a * b));
+    public int multiplication(int a, int b) {
+        return a * b;
     }
 
-    public void division(int a, int b) {
-        System.out.println("나누기 연산 a / b = " + (a / b));
+    public int division(int a, int b) {
+        return a / b;
     }
 
 }
diff --git a/src/test/java/study/CalculatorMainTest.java b/src/test/java/study/CalculatorMainTest.java
new file mode 100644
index 000000000..bfc9fb903
--- /dev/null
+++ b/src/test/java/study/CalculatorMainTest.java
@@ -0,0 +1,32 @@
+package study;
+
+import org.junit.jupiter.api.Test;
+import study2.Calculator;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class CalculatorMainTest {
+
+    Calculator calc = new Calculator();
+
+    @Test
+    void testAdd() {
+        assertEquals(5, calc.add(2,3));
+    }
+
+    @Test
+    void testSubtraction() {
+        assertEquals(1, calc.subtraction(3,2));
+    }
+
+    @Test
+    void testMultiplication() {
+        assertEquals(6, calc.multiplication(2,3));
+    }
+
+    @Test
+    void testDivision() {
+        assertEquals(2, calc.division(6,3));
+    }
+
+}
\ No newline at end of file