From 67d8c98af944c3a617e053ac0873d15fcb30acc1 Mon Sep 17 00:00:00 2001
From: yang Jiyoung <0112jyoung@naver.com>
Date: Thu, 10 Apr 2025 19:40:03 +0900
Subject: [PATCH 01/15] =?UTF-8?q?[docs]=20=EA=B8=B0=EB=8A=A5=EC=9A=94?=
 =?UTF-8?q?=EA=B5=AC=EC=82=AC=ED=95=AD=20=EC=A0=95=EB=A6=AC?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 README.md | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 4985061663..51b6a10b9e 100644
--- a/README.md
+++ b/README.md
@@ -6,4 +6,25 @@
 * 모든 피드백을 완료하면 다음 단계를 도전하고 앞의 과정을 반복한다.
 
 ## 온라인 코드 리뷰 과정
-* [텍스트와 이미지로 살펴보는 온라인 코드 리뷰 과정](https://github.com/next-step/nextstep-docs/tree/master/codereview)
\ No newline at end of file
+* [텍스트와 이미지로 살펴보는 온라인 코드 리뷰 과정](https://github.com/next-step/nextstep-docs/tree/master/codereview)
+
+## 2단계 요구사항
+- 강의
+- [ ] 과정(Course)은 기수 단위로 운영하며, 여러 개의 강의(Session)를 가질 수 있다.
+  - [ ] 강의는 시작일과 종료일을 가진다.
+  - [ ] 강의는 강의 커버 이미지 정보를 가진다.
+  - [ ] 강의는 무료 강의와 유료 강의로 나뉜다.
+    - [ ] 무료 강의는 최대 수강 인원 제한이 없다.
+    - [ ] 유료 강의는 강의 최대 수강 인원을 초과할 수 없다.
+    - [ ] 유료 강의는 수강생이 결제한 금액과 수강료가 일치할 때 수강 신청이 가능하다.
+  - [ ] 강의 상태는 준비중, 모집중, 종료 3가지 상태를 가진다.
+  - [ ] 강의 수강신청은 강의 상태가 모집중일 때만 가능하다.
+  - [ ] 유료 강의의 경우 결제는 이미 완료한 것으로 가정하고 이후 과정을 구현한다.
+  
+- 이미지
+- [ ] 이미지 크기는 1MB 이하여야 한다.
+- [ ] 이미지 타입은 gif, jpg(jpeg 포함),, png, svg만 허용한다.
+- [ ] 이미지의 width는 300픽셀, height는 200픽셀 이상이어야 하며, width와 height의 비율은 3:2여야 한다.
+
+- 결제
+  - [ ] 결제를 완료한 결제 정보는 payments 모듈을 통해 관리되며, 결제 정보는 Payment 객체에 담겨 반한된다.
\ No newline at end of file

From 69f7da00fbf1c3a808a41f41fd70098c127370e7 Mon Sep 17 00:00:00 2001
From: yang Jiyoung <0112jyoung@naver.com>
Date: Thu, 10 Apr 2025 19:56:44 +0900
Subject: [PATCH 02/15] =?UTF-8?q?[feat]=20=EA=B0=95=EC=9D=98=20=EC=9D=B4?=
 =?UTF-8?q?=EB=AF=B8=EC=A7=80=20=ED=83=80=EC=9E=85=20=EC=84=A4=EC=A0=95?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 README.md                                     |  2 +-
 .../domain/session/SessionImageType.java      | 21 ++++++++++++++++
 .../domain/session/SessionImageTypeTest.java  | 24 +++++++++++++++++++
 3 files changed, 46 insertions(+), 1 deletion(-)
 create mode 100644 src/main/java/nextstep/courses/domain/session/SessionImageType.java
 create mode 100644 src/test/java/nextstep/courses/domain/session/SessionImageTypeTest.java

diff --git a/README.md b/README.md
index 51b6a10b9e..159b70686d 100644
--- a/README.md
+++ b/README.md
@@ -23,7 +23,7 @@
   
 - 이미지
 - [ ] 이미지 크기는 1MB 이하여야 한다.
-- [ ] 이미지 타입은 gif, jpg(jpeg 포함),, png, svg만 허용한다.
+- [x] 이미지 타입은 gif, jpg(jpeg 포함), png, svg만 허용한다.
 - [ ] 이미지의 width는 300픽셀, height는 200픽셀 이상이어야 하며, width와 height의 비율은 3:2여야 한다.
 
 - 결제
diff --git a/src/main/java/nextstep/courses/domain/session/SessionImageType.java b/src/main/java/nextstep/courses/domain/session/SessionImageType.java
new file mode 100644
index 0000000000..c52bdef779
--- /dev/null
+++ b/src/main/java/nextstep/courses/domain/session/SessionImageType.java
@@ -0,0 +1,21 @@
+package nextstep.courses.domain.session;
+
+import java.util.Arrays;
+
+public enum SessionImageType {
+    gif("gif"), jpg("jpg"), jpeg("jpeg"), png("png"), svg("svg");
+
+    private final String name;
+
+    SessionImageType(String name) {
+        this.name = name;
+    }
+
+    public static SessionImageType of(String name) {
+        return Arrays.stream(values())
+                .filter(type -> type.name.equals(name))
+                .findFirst()
+                .orElseThrow(IllegalArgumentException::new);
+
+    }
+}
diff --git a/src/test/java/nextstep/courses/domain/session/SessionImageTypeTest.java b/src/test/java/nextstep/courses/domain/session/SessionImageTypeTest.java
new file mode 100644
index 0000000000..860d024f32
--- /dev/null
+++ b/src/test/java/nextstep/courses/domain/session/SessionImageTypeTest.java
@@ -0,0 +1,24 @@
+package nextstep.courses.domain.session;
+
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+import static nextstep.courses.domain.session.SessionImageType.gif;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class SessionImageTypeTest {
+
+    @Test
+    @DisplayName("이름이 똑같은 확장자를 찾아 리턴한다.")
+    void of() {
+        assertEquals(SessionImageType.of("gif"), gif);
+    }
+
+    @Test
+    @DisplayName("등록되지 않은 확장자를 넣으면 에러를 반환한다.")
+    void of_fail() {
+        assertThatThrownBy(() -> SessionImageType.of("xls"))
+                .isInstanceOf(IllegalArgumentException.class);
+    }
+}
\ No newline at end of file

From eafe229e0b91b775c967d9728dc570d06e49877a Mon Sep 17 00:00:00 2001
From: yang Jiyoung <0112jyoung@naver.com>
Date: Sat, 12 Apr 2025 14:01:17 +0900
Subject: [PATCH 03/15] =?UTF-8?q?[feat]=20=EA=B0=95=EC=9D=98=20=EC=9D=B4?=
 =?UTF-8?q?=EB=AF=B8=EC=A7=80=20=ED=81=B4=EB=9E=98=EC=8A=A4=20=EA=B5=AC?=
 =?UTF-8?q?=ED=98=84?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 README.md                                     |  4 +-
 .../courses/domain/session/SessionImage.java  | 57 +++++++++++++++++++
 .../domain/session/SessionImageTest.java      | 38 +++++++++++++
 3 files changed, 97 insertions(+), 2 deletions(-)
 create mode 100644 src/main/java/nextstep/courses/domain/session/SessionImage.java
 create mode 100644 src/test/java/nextstep/courses/domain/session/SessionImageTest.java

diff --git a/README.md b/README.md
index 159b70686d..bbc594a7da 100644
--- a/README.md
+++ b/README.md
@@ -22,9 +22,9 @@
   - [ ] 유료 강의의 경우 결제는 이미 완료한 것으로 가정하고 이후 과정을 구현한다.
   
 - 이미지
-- [ ] 이미지 크기는 1MB 이하여야 한다.
+- [x] 이미지 크기는 1MB 이하여야 한다.
 - [x] 이미지 타입은 gif, jpg(jpeg 포함), png, svg만 허용한다.
-- [ ] 이미지의 width는 300픽셀, height는 200픽셀 이상이어야 하며, width와 height의 비율은 3:2여야 한다.
+- [x] 이미지의 width는 300픽셀, height는 200픽셀 이상이어야 하며, width와 height의 비율은 3:2여야 한다.
 
 - 결제
   - [ ] 결제를 완료한 결제 정보는 payments 모듈을 통해 관리되며, 결제 정보는 Payment 객체에 담겨 반한된다.
\ No newline at end of file
diff --git a/src/main/java/nextstep/courses/domain/session/SessionImage.java b/src/main/java/nextstep/courses/domain/session/SessionImage.java
new file mode 100644
index 0000000000..69954155fb
--- /dev/null
+++ b/src/main/java/nextstep/courses/domain/session/SessionImage.java
@@ -0,0 +1,57 @@
+package nextstep.courses.domain.session;
+
+import java.util.Objects;
+
+public class SessionImage {
+    private static final int MAX_IMAGE_SIZE = 1000000;
+    private static final int MIN_WIDTH = 300;
+    private static final int MIN_HEIGHT = 200;
+    private static final double WIDTH_PER_HEIGHT = 1.5;
+
+    private final int width;
+    private final int height;
+    private final int size;
+    private final SessionImageType imageType;
+
+    public SessionImage(int width, int height, int size, String imageType) {
+        this(width, height, size, SessionImageType.of(imageType));
+    }
+
+    public SessionImage(int width, int height, int size, SessionImageType imageType) {
+        this.width = width;
+        this.height = height;
+        this.size = size;
+        this.imageType = imageType;
+        checkValidSessionImage();
+    }
+
+    private void checkValidSessionImage() {
+        if (this.width < MIN_WIDTH || this.height < MIN_HEIGHT) {
+            throw new IllegalArgumentException("이미지의 width는 300픽셀, height는 200픽셀 이상이어야 한다.");
+        }
+        if ((double) this.width / this.height != WIDTH_PER_HEIGHT) {
+            throw new IllegalArgumentException("이미지의 width, height의 비율은 3:2여야 한다.");
+        }
+
+        if (this.size > MAX_IMAGE_SIZE) {
+            throw new IllegalArgumentException("이미지의 크기는 1MB 이하여야 한다.");
+        }
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(width, height, size, imageType);
+    }
+
+    @Override
+    public boolean equals(Object object) {
+        if (object == this) {
+            return true;
+        }
+        if (object == null || getClass() != object.getClass()) {
+            return false;
+        }
+        SessionImage image = (SessionImage) object;
+        return Objects.equals(image.imageType, imageType) && image.width == width && image.height == height && image.size == size;
+    }
+}
diff --git a/src/test/java/nextstep/courses/domain/session/SessionImageTest.java b/src/test/java/nextstep/courses/domain/session/SessionImageTest.java
new file mode 100644
index 0000000000..05cfcff19c
--- /dev/null
+++ b/src/test/java/nextstep/courses/domain/session/SessionImageTest.java
@@ -0,0 +1,38 @@
+package nextstep.courses.domain.session;
+
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class SessionImageTest {
+
+    @Test
+    @DisplayName("이미지의 width는 300 이상, height는 200이면, size는 1mb 보다 작으면 정상적으로 생성된다.")
+    public void init() {
+        SessionImage image = new SessionImage(300, 200, 10, "jpg");
+        assertEquals(image, new SessionImage(300, 200, 10, "jpg"));
+    }
+
+    @Test
+    @DisplayName("이미지의 최소 크기를 넘지 못하면 에러가 발생한다.")
+    public void init_invalid_heightwidth() {
+        assertThatThrownBy(() -> new SessionImage(30, 20, 10, "jgp"))
+                .isInstanceOf(IllegalArgumentException.class);
+    }
+
+    @Test
+    @DisplayName("이미지의 비율이 맞지 않으면 에러가 발생한다.")
+    public void init_invalid_ratio() {
+        assertThatThrownBy(() -> new SessionImage(20, 20, 10, "jpg"))
+                .isInstanceOf(IllegalArgumentException.class);
+    }
+
+    @Test
+    @DisplayName("이미지의 크기가 1mb보다 크면 에러가 발생한다.")
+    public void init_invalid_size() {
+        assertThatThrownBy(() -> new SessionImage(30, 20, 10000000, "jgp"))
+                .isInstanceOf(IllegalArgumentException.class);
+    }
+}
\ No newline at end of file

From b981844ce6a307a88567cc08c915183c93731689 Mon Sep 17 00:00:00 2001
From: yang Jiyoung <0112jyoung@naver.com>
Date: Sat, 12 Apr 2025 15:34:21 +0900
Subject: [PATCH 04/15] =?UTF-8?q?[feat]=20=EA=B0=95=EC=9D=98=20=EC=88=98?=
 =?UTF-8?q?=EA=B0=95=20=EC=9D=B8=EC=9B=90=20=EA=B5=AC=ED=98=84?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 README.md                                     |  2 +-
 .../domain/session/SessionCapacity.java       | 55 +++++++++++++++++++
 .../domain/session/SessionCapacityTest.java   | 33 +++++++++++
 3 files changed, 89 insertions(+), 1 deletion(-)
 create mode 100644 src/main/java/nextstep/courses/domain/session/SessionCapacity.java
 create mode 100644 src/test/java/nextstep/courses/domain/session/SessionCapacityTest.java

diff --git a/README.md b/README.md
index bbc594a7da..85e34d4bd1 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,7 @@
   - [ ] 강의는 강의 커버 이미지 정보를 가진다.
   - [ ] 강의는 무료 강의와 유료 강의로 나뉜다.
     - [ ] 무료 강의는 최대 수강 인원 제한이 없다.
-    - [ ] 유료 강의는 강의 최대 수강 인원을 초과할 수 없다.
+    - [x] 유료 강의는 강의 최대 수강 인원을 초과할 수 없다.
     - [ ] 유료 강의는 수강생이 결제한 금액과 수강료가 일치할 때 수강 신청이 가능하다.
   - [ ] 강의 상태는 준비중, 모집중, 종료 3가지 상태를 가진다.
   - [ ] 강의 수강신청은 강의 상태가 모집중일 때만 가능하다.
diff --git a/src/main/java/nextstep/courses/domain/session/SessionCapacity.java b/src/main/java/nextstep/courses/domain/session/SessionCapacity.java
new file mode 100644
index 0000000000..f39804aba2
--- /dev/null
+++ b/src/main/java/nextstep/courses/domain/session/SessionCapacity.java
@@ -0,0 +1,55 @@
+package nextstep.courses.domain.session;
+
+import java.util.Objects;
+
+public class SessionCapacity {
+    private static final int MIN_CAPACITY = 1;
+
+    private int capacity;
+    private final int maxCapacity;
+
+    public SessionCapacity(int capacity, int maxCapacity) {
+        this.capacity = capacity;
+        this.maxCapacity = maxCapacity;
+        checkValidCapacity();
+    }
+
+    public SessionCapacity(int maxCapacity) {
+        this(0, maxCapacity);
+    }
+
+    private void checkValidCapacity() {
+        if (maxCapacity < MIN_CAPACITY) {
+            throw new IllegalArgumentException();
+        }
+        isValidCapacity();
+    }
+
+    public void increase() {
+        capacity++;
+        isValidCapacity();
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(capacity, maxCapacity);
+    }
+
+    @Override
+    public boolean equals(Object object) {
+        if (object == this) {
+            return true;
+        }
+        if (object == null || getClass() != object.getClass()) {
+            return false;
+        }
+        SessionCapacity sessionCapacity = (SessionCapacity) object;
+        return sessionCapacity.capacity == this.capacity && sessionCapacity.maxCapacity == this.maxCapacity;
+    }
+
+    private void isValidCapacity(){
+        if(this.capacity > this.maxCapacity) {
+            throw new IllegalArgumentException("최대 수용 인원을 현재 인원이 초과할 수 없다.");
+        }
+    }
+}
diff --git a/src/test/java/nextstep/courses/domain/session/SessionCapacityTest.java b/src/test/java/nextstep/courses/domain/session/SessionCapacityTest.java
new file mode 100644
index 0000000000..af32322567
--- /dev/null
+++ b/src/test/java/nextstep/courses/domain/session/SessionCapacityTest.java
@@ -0,0 +1,33 @@
+package nextstep.courses.domain.session;
+
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class SessionCapacityTest {
+
+    @Test
+    @DisplayName("등록하면 하나가 찬다.")
+    void increase_success() {
+        SessionCapacity capacity = new SessionCapacity(10);
+        capacity.increase();
+        assertEquals(capacity, new SessionCapacity(1, 10));
+    }
+
+    @Test
+    @DisplayName("maxCapacity보다 더 수강하려면 에러를 반환한다.")
+    void increase_fail() {
+        SessionCapacity capacity = new SessionCapacity(10, 10);
+        assertThatThrownBy(capacity::increase)
+                .isInstanceOf(IllegalArgumentException.class);
+    }
+
+    @Test
+    @DisplayName("초기화 시 수강인원이 최대 인원보다 크면 에러를 반환한다.")
+    void init() {
+        assertThatThrownBy(() -> new SessionCapacity(11, 10))
+                .isInstanceOf(IllegalArgumentException.class);
+    }
+}
\ No newline at end of file

From 101a9783f005cf93d1c6fa94d308f68e3d7b99a1 Mon Sep 17 00:00:00 2001
From: yang Jiyoung <0112jyoung@naver.com>
Date: Sat, 12 Apr 2025 15:46:33 +0900
Subject: [PATCH 05/15] =?UTF-8?q?[feat]=20=EA=B0=95=EC=9D=98=20=EC=83=81?=
 =?UTF-8?q?=ED=83=9C=20=EC=84=A4=EC=A0=95?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 README.md                                     |  4 +--
 .../courses/domain/session/SessionState.java  | 11 ++++++++
 .../domain/session/SessionStateTest.java      | 27 +++++++++++++++++++
 3 files changed, 40 insertions(+), 2 deletions(-)
 create mode 100644 src/main/java/nextstep/courses/domain/session/SessionState.java
 create mode 100644 src/test/java/nextstep/courses/domain/session/SessionStateTest.java

diff --git a/README.md b/README.md
index 85e34d4bd1..2262724312 100644
--- a/README.md
+++ b/README.md
@@ -17,8 +17,8 @@
     - [ ] 무료 강의는 최대 수강 인원 제한이 없다.
     - [x] 유료 강의는 강의 최대 수강 인원을 초과할 수 없다.
     - [ ] 유료 강의는 수강생이 결제한 금액과 수강료가 일치할 때 수강 신청이 가능하다.
-  - [ ] 강의 상태는 준비중, 모집중, 종료 3가지 상태를 가진다.
-  - [ ] 강의 수강신청은 강의 상태가 모집중일 때만 가능하다.
+  - [x] 강의 상태는 준비중, 모집중, 종료 3가지 상태를 가진다.
+  - [x] 강의 수강신청은 강의 상태가 모집중일 때만 가능하다.
   - [ ] 유료 강의의 경우 결제는 이미 완료한 것으로 가정하고 이후 과정을 구현한다.
   
 - 이미지
diff --git a/src/main/java/nextstep/courses/domain/session/SessionState.java b/src/main/java/nextstep/courses/domain/session/SessionState.java
new file mode 100644
index 0000000000..973c431ab9
--- /dev/null
+++ b/src/main/java/nextstep/courses/domain/session/SessionState.java
@@ -0,0 +1,11 @@
+package nextstep.courses.domain.session;
+
+public enum SessionState {
+    PREPARING,
+    RECRUITING,
+    CLOSED;
+
+    public boolean canRecruit(){
+        return this == RECRUITING;
+    }
+}
diff --git a/src/test/java/nextstep/courses/domain/session/SessionStateTest.java b/src/test/java/nextstep/courses/domain/session/SessionStateTest.java
new file mode 100644
index 0000000000..167cb448ca
--- /dev/null
+++ b/src/test/java/nextstep/courses/domain/session/SessionStateTest.java
@@ -0,0 +1,27 @@
+package nextstep.courses.domain.session;
+
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.EnumSource;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+class SessionStateTest {
+
+    @Test
+    @DisplayName("준비중 상태에는 등록할 수 있다.")
+    void canApply() {
+        SessionState state = SessionState.RECRUITING;
+        assertTrue(state.canRecruit());
+    }
+
+    @ParameterizedTest
+    @EnumSource(value = SessionState.class, mode = EnumSource.Mode.EXCLUDE, names = {"RECRUITING"})
+    @DisplayName("준비중이 아닌 상태에서는 등록할 수 없다.")
+    void cannotApply(SessionState state) {
+        assertFalse(state.canRecruit());
+    }
+
+}
\ No newline at end of file

From c26c840a86ce92841730abbc71c365ff0f1f4b15 Mon Sep 17 00:00:00 2001
From: yang Jiyoung <0112jyoung@naver.com>
Date: Sat, 12 Apr 2025 15:52:17 +0900
Subject: [PATCH 06/15] =?UTF-8?q?[feat]=20=EA=B0=95=EC=9D=98=20=EB=82=A0?=
 =?UTF-8?q?=EC=A7=9C=20=EC=84=A4=EC=A0=95?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 README.md                                       |  4 ++--
 .../courses/domain/session/SessionDate.java     | 17 +++++++++++++++++
 2 files changed, 19 insertions(+), 2 deletions(-)
 create mode 100644 src/main/java/nextstep/courses/domain/session/SessionDate.java

diff --git a/README.md b/README.md
index 2262724312..3752031aab 100644
--- a/README.md
+++ b/README.md
@@ -11,8 +11,8 @@
 ## 2단계 요구사항
 - 강의
 - [ ] 과정(Course)은 기수 단위로 운영하며, 여러 개의 강의(Session)를 가질 수 있다.
-  - [ ] 강의는 시작일과 종료일을 가진다.
-  - [ ] 강의는 강의 커버 이미지 정보를 가진다.
+  - [x] 강의는 시작일과 종료일을 가진다.
+  - [x] 강의는 강의 커버 이미지 정보를 가진다.
   - [ ] 강의는 무료 강의와 유료 강의로 나뉜다.
     - [ ] 무료 강의는 최대 수강 인원 제한이 없다.
     - [x] 유료 강의는 강의 최대 수강 인원을 초과할 수 없다.
diff --git a/src/main/java/nextstep/courses/domain/session/SessionDate.java b/src/main/java/nextstep/courses/domain/session/SessionDate.java
new file mode 100644
index 0000000000..c3ed184630
--- /dev/null
+++ b/src/main/java/nextstep/courses/domain/session/SessionDate.java
@@ -0,0 +1,17 @@
+package nextstep.courses.domain.session;
+
+import java.time.LocalDate;
+
+public class SessionDate {
+    private final LocalDate startDate;
+    private final LocalDate endDate;
+
+    public SessionDate(LocalDate startDate, LocalDate endDate) {
+        this.startDate = startDate;
+        this.endDate = endDate;
+    }
+
+    public boolean isBefore(LocalDate date) {
+        return date.isBefore(startDate);
+    }
+}

From 62b16733c6a43046f852d98fe7835480ae18b61b Mon Sep 17 00:00:00 2001
From: yang Jiyoung <0112jyoung@naver.com>
Date: Sat, 12 Apr 2025 15:54:39 +0900
Subject: [PATCH 07/15] =?UTF-8?q?[feat]=20=EC=9C=A0=EB=A3=8C=20/=20?=
 =?UTF-8?q?=EB=AC=B4=EB=A3=8C=20=EC=A0=84=EB=9E=B5=20=ED=8C=A8=ED=84=B4=20?=
 =?UTF-8?q?=EC=84=A4=EC=A0=95?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 README.md                                      |  2 +-
 .../courses/strategy/FreePaymentStrategy.java  | 10 ++++++++++
 .../courses/strategy/PaidPaymentStrategy.java  | 18 ++++++++++++++++++
 .../courses/strategy/PaymentStrategy.java      |  7 +++++++
 .../java/nextstep/payments/domain/Payment.java |  4 ++++
 5 files changed, 40 insertions(+), 1 deletion(-)
 create mode 100644 src/main/java/nextstep/courses/strategy/FreePaymentStrategy.java
 create mode 100644 src/main/java/nextstep/courses/strategy/PaidPaymentStrategy.java
 create mode 100644 src/main/java/nextstep/courses/strategy/PaymentStrategy.java

diff --git a/README.md b/README.md
index 3752031aab..0532101524 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,7 @@
   - [ ] 강의는 무료 강의와 유료 강의로 나뉜다.
     - [ ] 무료 강의는 최대 수강 인원 제한이 없다.
     - [x] 유료 강의는 강의 최대 수강 인원을 초과할 수 없다.
-    - [ ] 유료 강의는 수강생이 결제한 금액과 수강료가 일치할 때 수강 신청이 가능하다.
+    - [x] 유료 강의는 수강생이 결제한 금액과 수강료가 일치할 때 수강 신청이 가능하다.
   - [x] 강의 상태는 준비중, 모집중, 종료 3가지 상태를 가진다.
   - [x] 강의 수강신청은 강의 상태가 모집중일 때만 가능하다.
   - [ ] 유료 강의의 경우 결제는 이미 완료한 것으로 가정하고 이후 과정을 구현한다.
diff --git a/src/main/java/nextstep/courses/strategy/FreePaymentStrategy.java b/src/main/java/nextstep/courses/strategy/FreePaymentStrategy.java
new file mode 100644
index 0000000000..be3ce88741
--- /dev/null
+++ b/src/main/java/nextstep/courses/strategy/FreePaymentStrategy.java
@@ -0,0 +1,10 @@
+package nextstep.courses.strategy;
+
+import nextstep.payments.domain.Payment;
+
+public class FreePaymentStrategy implements PaymentStrategy {
+    @Override
+    public boolean payable(Payment payment) {
+        return true;
+    }
+}
diff --git a/src/main/java/nextstep/courses/strategy/PaidPaymentStrategy.java b/src/main/java/nextstep/courses/strategy/PaidPaymentStrategy.java
new file mode 100644
index 0000000000..8edd701325
--- /dev/null
+++ b/src/main/java/nextstep/courses/strategy/PaidPaymentStrategy.java
@@ -0,0 +1,18 @@
+package nextstep.courses.strategy;
+
+import nextstep.payments.domain.Payment;
+
+public class PaidPaymentStrategy implements PaymentStrategy {
+    private final long price;
+
+    public PaidPaymentStrategy(long price) {
+        this.price = price;
+    }
+
+    @Override
+    public boolean payable(Payment payment) {
+        if (payment.isSameAmount(price))
+            return false;
+        return true;
+    }
+}
diff --git a/src/main/java/nextstep/courses/strategy/PaymentStrategy.java b/src/main/java/nextstep/courses/strategy/PaymentStrategy.java
new file mode 100644
index 0000000000..0ee22fe4df
--- /dev/null
+++ b/src/main/java/nextstep/courses/strategy/PaymentStrategy.java
@@ -0,0 +1,7 @@
+package nextstep.courses.strategy;
+
+import nextstep.payments.domain.Payment;
+
+public interface PaymentStrategy {
+    boolean payable(Payment payment);
+}
diff --git a/src/main/java/nextstep/payments/domain/Payment.java b/src/main/java/nextstep/payments/domain/Payment.java
index 57d833f851..5733696bf9 100644
--- a/src/main/java/nextstep/payments/domain/Payment.java
+++ b/src/main/java/nextstep/payments/domain/Payment.java
@@ -26,4 +26,8 @@ public Payment(String id, Long sessionId, Long nsUserId, Long amount) {
         this.amount = amount;
         this.createdAt = LocalDateTime.now();
     }
+
+    public boolean isSameAmount(long amount){
+        return amount == this.amount;
+    }
 }

From eb4aecdd023f3abf0cfcfc89f6a5bbabe24c3330 Mon Sep 17 00:00:00 2001
From: yang Jiyoung <0112jyoung@naver.com>
Date: Sat, 12 Apr 2025 16:01:55 +0900
Subject: [PATCH 08/15] =?UTF-8?q?[refactor]=20=ED=8C=A8=ED=82=A4=EC=A7=80?=
 =?UTF-8?q?=20=EC=9D=B4=EB=8F=99?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../java/nextstep/courses/domain/{ => course}/Course.java     | 2 +-
 .../courses/domain/{ => course}/CourseRepository.java         | 2 +-
 .../nextstep/courses/infrastructure/JdbcCourseRepository.java | 4 ++--
 .../nextstep/courses/infrastructure/CourseRepositoryTest.java | 4 ++--
 4 files changed, 6 insertions(+), 6 deletions(-)
 rename src/main/java/nextstep/courses/domain/{ => course}/Course.java (96%)
 rename src/main/java/nextstep/courses/domain/{ => course}/CourseRepository.java (71%)

diff --git a/src/main/java/nextstep/courses/domain/Course.java b/src/main/java/nextstep/courses/domain/course/Course.java
similarity index 96%
rename from src/main/java/nextstep/courses/domain/Course.java
rename to src/main/java/nextstep/courses/domain/course/Course.java
index 0f69716043..1c935f2fcc 100644
--- a/src/main/java/nextstep/courses/domain/Course.java
+++ b/src/main/java/nextstep/courses/domain/course/Course.java
@@ -1,4 +1,4 @@
-package nextstep.courses.domain;
+package nextstep.courses.domain.course;
 
 import java.time.LocalDateTime;
 
diff --git a/src/main/java/nextstep/courses/domain/CourseRepository.java b/src/main/java/nextstep/courses/domain/course/CourseRepository.java
similarity index 71%
rename from src/main/java/nextstep/courses/domain/CourseRepository.java
rename to src/main/java/nextstep/courses/domain/course/CourseRepository.java
index 6aaeb638d1..28180d25e0 100644
--- a/src/main/java/nextstep/courses/domain/CourseRepository.java
+++ b/src/main/java/nextstep/courses/domain/course/CourseRepository.java
@@ -1,4 +1,4 @@
-package nextstep.courses.domain;
+package nextstep.courses.domain.course;
 
 public interface CourseRepository {
     int save(Course course);
diff --git a/src/main/java/nextstep/courses/infrastructure/JdbcCourseRepository.java b/src/main/java/nextstep/courses/infrastructure/JdbcCourseRepository.java
index f9122cbe33..7489afc31d 100644
--- a/src/main/java/nextstep/courses/infrastructure/JdbcCourseRepository.java
+++ b/src/main/java/nextstep/courses/infrastructure/JdbcCourseRepository.java
@@ -1,7 +1,7 @@
 package nextstep.courses.infrastructure;
 
-import nextstep.courses.domain.Course;
-import nextstep.courses.domain.CourseRepository;
+import nextstep.courses.domain.course.Course;
+import nextstep.courses.domain.course.CourseRepository;
 import org.springframework.jdbc.core.JdbcOperations;
 import org.springframework.jdbc.core.RowMapper;
 import org.springframework.stereotype.Repository;
diff --git a/src/test/java/nextstep/courses/infrastructure/CourseRepositoryTest.java b/src/test/java/nextstep/courses/infrastructure/CourseRepositoryTest.java
index f087fc0ad2..530375d3e1 100644
--- a/src/test/java/nextstep/courses/infrastructure/CourseRepositoryTest.java
+++ b/src/test/java/nextstep/courses/infrastructure/CourseRepositoryTest.java
@@ -1,7 +1,7 @@
 package nextstep.courses.infrastructure;
 
-import nextstep.courses.domain.Course;
-import nextstep.courses.domain.CourseRepository;
+import nextstep.courses.domain.course.Course;
+import nextstep.courses.domain.course.CourseRepository;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 import org.slf4j.Logger;

From 1acc6f13c0c0d5880d14d3286f33b15ee4eab0c5 Mon Sep 17 00:00:00 2001
From: yang Jiyoung <0112jyoung@naver.com>
Date: Sat, 12 Apr 2025 16:18:22 +0900
Subject: [PATCH 09/15] =?UTF-8?q?[feat]=20=EB=93=B1=EB=A1=9D=20=ED=96=89?=
 =?UTF-8?q?=EC=9C=84=20=EC=84=A4=EC=A0=95?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../courses/domain/session/Enrollment.java    | 51 +++++++++++++++++++
 .../domain/session/EnrollmentTest.java        | 30 +++++++++++
 2 files changed, 81 insertions(+)
 create mode 100644 src/main/java/nextstep/courses/domain/session/Enrollment.java
 create mode 100644 src/test/java/nextstep/courses/domain/session/EnrollmentTest.java

diff --git a/src/main/java/nextstep/courses/domain/session/Enrollment.java b/src/main/java/nextstep/courses/domain/session/Enrollment.java
new file mode 100644
index 0000000000..f57d740335
--- /dev/null
+++ b/src/main/java/nextstep/courses/domain/session/Enrollment.java
@@ -0,0 +1,51 @@
+package nextstep.courses.domain.session;
+
+import nextstep.users.domain.NsUser;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Objects;
+
+public class Enrollment {
+    private final List<NsUser> users;
+    private final SessionCapacity sessionCapacity;
+
+    public Enrollment(List<NsUser> users, SessionCapacity sessionCapacity) {
+        this.users = users;
+        this.sessionCapacity = sessionCapacity;
+    }
+
+    public Enrollment(SessionCapacity sessionCapacity) {
+        this(new ArrayList<>(), sessionCapacity);
+    }
+
+    public Enrollment(int capacity) {
+        this(new ArrayList<>(), new SessionCapacity(capacity));
+    }
+
+    public Enrollment(List<NsUser> users) {
+        this(users, new SessionCapacity(0));
+    }
+
+    public void enroll(NsUser user) {
+        sessionCapacity.increase();
+        this.users.add(user);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hashCode(users);
+    }
+
+    @Override
+    public boolean equals(Object object) {
+        if (object == this) {
+            return true;
+        }
+        if (object == null || getClass() != object.getClass()) {
+            return false;
+        }
+        Enrollment enrollment = (Enrollment) object;
+        return Objects.equals(enrollment.users, this.users);
+    }
+}
diff --git a/src/test/java/nextstep/courses/domain/session/EnrollmentTest.java b/src/test/java/nextstep/courses/domain/session/EnrollmentTest.java
new file mode 100644
index 0000000000..2e32695b9e
--- /dev/null
+++ b/src/test/java/nextstep/courses/domain/session/EnrollmentTest.java
@@ -0,0 +1,30 @@
+package nextstep.courses.domain.session;
+
+import nextstep.users.domain.NsUserTest;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class EnrollmentTest {
+
+    @Test
+    @DisplayName("등록에 성공한다.")
+    void enroll() {
+        Enrollment enrollment = new Enrollment(10);
+        enrollment.enroll(NsUserTest.JAVAJIGI);
+        assertEquals(enrollment, new Enrollment(List.of(NsUserTest.JAVAJIGI), new SessionCapacity(10)));
+    }
+
+    @Test
+    @DisplayName("인원 초과로 인해 등록에 실패한다.")
+    void enroll_fail() {
+        Enrollment enrollment = new Enrollment(1);
+        enrollment.enroll(NsUserTest.JAVAJIGI);
+        assertThatThrownBy(() -> enrollment.enroll(NsUserTest.SANJIGI))
+                .isInstanceOf(IllegalArgumentException.class);
+    }
+}
\ No newline at end of file

From eeeae9090b571b1158e2fb1a839576b89dce8418 Mon Sep 17 00:00:00 2001
From: yang Jiyoung <0112jyoung@naver.com>
Date: Sat, 12 Apr 2025 19:58:13 +0900
Subject: [PATCH 10/15] =?UTF-8?q?[feat]=20=EA=B2=B0=EC=A0=9C=20=EB=B0=A9?=
 =?UTF-8?q?=EC=8B=9D=20=EC=88=98=EC=A0=95=20=EB=B0=8F=20=ED=85=8C=EC=8A=A4?=
 =?UTF-8?q?=ED=8A=B8=20=EC=B6=94=EA=B0=80?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../courses/strategy/PaidPaymentStrategy.java |  4 ++--
 .../courses/strategy/PaymentStrategyTest.java | 24 +++++++++++++++++++
 2 files changed, 26 insertions(+), 2 deletions(-)
 create mode 100644 src/test/java/nextstep/courses/strategy/PaymentStrategyTest.java

diff --git a/src/main/java/nextstep/courses/strategy/PaidPaymentStrategy.java b/src/main/java/nextstep/courses/strategy/PaidPaymentStrategy.java
index 8edd701325..640a89fc7b 100644
--- a/src/main/java/nextstep/courses/strategy/PaidPaymentStrategy.java
+++ b/src/main/java/nextstep/courses/strategy/PaidPaymentStrategy.java
@@ -12,7 +12,7 @@ public PaidPaymentStrategy(long price) {
     @Override
     public boolean payable(Payment payment) {
         if (payment.isSameAmount(price))
-            return false;
-        return true;
+            return true;
+        return false;
     }
 }
diff --git a/src/test/java/nextstep/courses/strategy/PaymentStrategyTest.java b/src/test/java/nextstep/courses/strategy/PaymentStrategyTest.java
new file mode 100644
index 0000000000..927fe2bd61
--- /dev/null
+++ b/src/test/java/nextstep/courses/strategy/PaymentStrategyTest.java
@@ -0,0 +1,24 @@
+package nextstep.courses.strategy;
+
+import nextstep.payments.domain.Payment;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class PaymentStrategyTest {
+
+    @Test
+    @DisplayName("무료인 경기는 금액을 내지 않아도 된다.")
+    public void free(){
+        FreePaymentStrategy freePaymentStrategy = new FreePaymentStrategy();
+        assertTrue(freePaymentStrategy.payable(new Payment()));
+    }
+
+    @Test
+    @DisplayName("유료인 경기는 낸 가격과 동일한 가격이다.")
+    public void paid() {
+        PaidPaymentStrategy paidPaymentStrategy = new PaidPaymentStrategy(1000L);
+        assertTrue(paidPaymentStrategy.payable(new Payment("1", 1L, 1L, 1000L)));
+    }
+}
\ No newline at end of file

From 5a0bb9f833f63ae78fee0e6f9e8017c6ecfed785 Mon Sep 17 00:00:00 2001
From: yang Jiyoung <0112jyoung@naver.com>
Date: Sat, 12 Apr 2025 21:38:13 +0900
Subject: [PATCH 11/15] =?UTF-8?q?[feat]=20=EA=B0=95=EC=9D=98=20=EA=B5=AC?=
 =?UTF-8?q?=ED=98=84=20=EC=84=A4=EC=A0=95?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../courses/domain/session/Session.java       | 42 +++++++++++
 .../courses/domain/session/SessionTest.java   | 71 +++++++++++++++++++
 2 files changed, 113 insertions(+)
 create mode 100644 src/main/java/nextstep/courses/domain/session/Session.java
 create mode 100644 src/test/java/nextstep/courses/domain/session/SessionTest.java

diff --git a/src/main/java/nextstep/courses/domain/session/Session.java b/src/main/java/nextstep/courses/domain/session/Session.java
new file mode 100644
index 0000000000..8e211b9289
--- /dev/null
+++ b/src/main/java/nextstep/courses/domain/session/Session.java
@@ -0,0 +1,42 @@
+package nextstep.courses.domain.session;
+
+import nextstep.courses.strategy.PaymentStrategy;
+import nextstep.payments.domain.Payment;
+import nextstep.users.domain.NsUser;
+
+import java.time.LocalDate;
+
+public class Session {
+    private final SessionImage image;
+    private final SessionDate date;
+    private final SessionState state;
+    private final Enrollment enrollment;
+    private final PaymentStrategy paymentStrategy;
+
+    public Session(SessionImage image, SessionDate date, SessionState state, Enrollment enrollment, PaymentStrategy paymentStrategy) {
+        this.image = image;
+        this.date = date;
+        this.state = state;
+        this.enrollment = enrollment;
+        this.paymentStrategy = paymentStrategy;
+    }
+
+    public void applySession(NsUser user, LocalDate enrollDate, Payment payment) {
+        if (!canApply(enrollDate, payment)) {
+            throw new IllegalArgumentException("등록 불가능한 상태입니다.");
+        }
+        this.enrollment.enroll(user);
+    }
+
+    private boolean canApply(LocalDate enrollDate, Payment payment) {
+        if (!state.canRecruit()) {
+            return false;
+        }
+
+        if (!date.isBefore(enrollDate)) {
+            return false;
+        }
+
+        return paymentStrategy.payable(payment);
+    }
+}
diff --git a/src/test/java/nextstep/courses/domain/session/SessionTest.java b/src/test/java/nextstep/courses/domain/session/SessionTest.java
new file mode 100644
index 0000000000..ae1af06805
--- /dev/null
+++ b/src/test/java/nextstep/courses/domain/session/SessionTest.java
@@ -0,0 +1,71 @@
+package nextstep.courses.domain.session;
+
+import nextstep.courses.strategy.FreePaymentStrategy;
+import nextstep.courses.strategy.PaidPaymentStrategy;
+import nextstep.payments.domain.Payment;
+import nextstep.users.domain.NsUserTest;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+import java.time.LocalDate;
+
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+
+class SessionTest {
+    private SessionImage image;
+    private SessionDate date;
+    private SessionState state;
+    private Enrollment enrollment;
+
+    @BeforeEach
+    void init() {
+        image = new SessionImage(300, 200, 10, "jpg");
+        date = new SessionDate(LocalDate.now(), LocalDate.now().plusDays(7));
+        state = SessionState.RECRUITING;
+        enrollment = new Enrollment(10);
+    }
+
+    @Test
+    @DisplayName("무료 강의를 등록한다.")
+    void applyFreeSession() {
+        FreePaymentStrategy freePaymentStrategy = new FreePaymentStrategy();
+        Session session = new Session(image, date, state, enrollment, freePaymentStrategy);
+        session.applySession(NsUserTest.JAVAJIGI, LocalDate.now().minusDays(1), new Payment());
+    }
+
+    @Test
+    @DisplayName("유료 강의를 등록한다.")
+    void applyPaidSession() {
+        PaidPaymentStrategy paidPaymentStrategy = new PaidPaymentStrategy(1000L);
+        Session session = new Session(image, date, state, enrollment, paidPaymentStrategy);
+        session.applySession(NsUserTest.JAVAJIGI, LocalDate.now().minusDays(1), new Payment("1L", 1L, 1L, 1000L));
+    }
+
+    @Test
+    @DisplayName("모집 상태가 아니면 등록할 수 없다.")
+    void applySessionFailByState() {
+        FreePaymentStrategy freePaymentStrategy = new FreePaymentStrategy();
+        Session session = new Session(image, date, SessionState.PREPARING, enrollment, freePaymentStrategy);
+        assertThatThrownBy(() -> session.applySession(NsUserTest.JAVAJIGI, LocalDate.now(), new Payment()))
+                .isInstanceOf(IllegalArgumentException.class);
+    }
+
+    @Test
+    @DisplayName("강의 시작 중에는 등록할 수 없다.")
+    void applySessionFailByDate() {
+        FreePaymentStrategy freePaymentStrategy = new FreePaymentStrategy();
+        Session session = new Session(image, date, state, enrollment, freePaymentStrategy);
+        assertThatThrownBy(() -> session.applySession(NsUserTest.JAVAJIGI, LocalDate.now().plusDays(10), new Payment()))
+                .isInstanceOf(IllegalArgumentException.class);
+    }
+
+    @Test
+    @DisplayName("돈이 맞지 않으면 유료 강의에 등록할 수 없다.")
+    void applySessionFailByPayment() {
+        PaidPaymentStrategy paidPaymentStrategy = new PaidPaymentStrategy(1000L);
+        Session session = new Session(image, date, state, enrollment, paidPaymentStrategy);
+        assertThatThrownBy(() -> session.applySession(NsUserTest.JAVAJIGI, LocalDate.now(), new Payment("1L", 1L, 1L, 2000L)))
+                .isInstanceOf(IllegalArgumentException.class);
+    }
+}
\ No newline at end of file

From d8f480f6b6b527c09ce1de5b2d14a19373c062a1 Mon Sep 17 00:00:00 2001
From: yang Jiyoung <0112jyoung@naver.com>
Date: Sun, 13 Apr 2025 08:31:55 +0900
Subject: [PATCH 12/15] =?UTF-8?q?[refactor]=20=EB=AF=B8=EC=82=AC=EC=9A=A9?=
 =?UTF-8?q?=20=ED=95=A8=EC=88=98=20=EC=A0=9C=EA=B1=B0?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 src/main/java/nextstep/qna/domain/Question.java | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/src/main/java/nextstep/qna/domain/Question.java b/src/main/java/nextstep/qna/domain/Question.java
index ed79697773..256e185328 100644
--- a/src/main/java/nextstep/qna/domain/Question.java
+++ b/src/main/java/nextstep/qna/domain/Question.java
@@ -42,13 +42,6 @@ public Long getId() {
         return id;
     }
 
-    public String getTitle() {
-        return title;
-    }
-
-    public String getContents() {
-        return contents;
-    }
 
     public NsUser getWriter() {
         return writer;
@@ -90,4 +83,6 @@ private void checkValidDeleteUser(NsUser loginUser) throws CannotDeleteException
             throw new CannotDeleteException("다른 사람이 쓴 답변이 있어 삭제할 수 없습니다.");
         }
     }
+
+
 }

From f249b5d344c9330db59e3ace41cf556612909797 Mon Sep 17 00:00:00 2001
From: yang Jiyoung <0112jyoung@naver.com>
Date: Sun, 13 Apr 2025 08:39:04 +0900
Subject: [PATCH 13/15] =?UTF-8?q?[refactor]=20=EC=A0=95=EC=A0=81=20?=
 =?UTF-8?q?=ED=8C=A9=ED=86=A0=EB=A6=AC=20=EB=A9=94=EC=86=8C=EB=93=9C=20?=
 =?UTF-8?q?=EC=B6=94=EA=B0=80?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 src/main/java/nextstep/qna/domain/Answer.java        | 2 +-
 src/main/java/nextstep/qna/domain/DeleteHistory.java | 8 ++++++++
 src/main/java/nextstep/qna/domain/Question.java      | 2 +-
 3 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/src/main/java/nextstep/qna/domain/Answer.java b/src/main/java/nextstep/qna/domain/Answer.java
index ccf00f8e3f..a9ccc9d2c1 100644
--- a/src/main/java/nextstep/qna/domain/Answer.java
+++ b/src/main/java/nextstep/qna/domain/Answer.java
@@ -70,6 +70,6 @@ public String toString() {
 
     public DeleteHistory delete() {
         this.deleted = true;
-        return new DeleteHistory(ContentType.ANSWER, id, writer, LocalDateTime.now());
+        return DeleteHistory.deleteAnswer(id, writer);
     }
 }
diff --git a/src/main/java/nextstep/qna/domain/DeleteHistory.java b/src/main/java/nextstep/qna/domain/DeleteHistory.java
index 43c37e5e5c..28df822498 100644
--- a/src/main/java/nextstep/qna/domain/DeleteHistory.java
+++ b/src/main/java/nextstep/qna/domain/DeleteHistory.java
@@ -47,4 +47,12 @@ public String toString() {
         return "DeleteHistory [id=" + id + ", contentType=" + contentType + ", contentId=" + contentId + ", deletedBy="
                 + deletedBy + ", createdDate=" + createdDate + "]";
     }
+
+    public static DeleteHistory deleteAnswer(Long id, NsUser writer) {
+        return new DeleteHistory(ContentType.ANSWER, id, writer, LocalDateTime.now());
+    }
+
+    public static DeleteHistory deleteQuestion(Long id, NsUser writer) {
+        return new DeleteHistory(ContentType.QUESTION, id, writer, LocalDateTime.now());
+    }
 }
diff --git a/src/main/java/nextstep/qna/domain/Question.java b/src/main/java/nextstep/qna/domain/Question.java
index 256e185328..02cf57e004 100644
--- a/src/main/java/nextstep/qna/domain/Question.java
+++ b/src/main/java/nextstep/qna/domain/Question.java
@@ -69,7 +69,7 @@ public List<DeleteHistory> delete(NsUser loginUser) throws CannotDeleteException
         checkValidDeleteUser(loginUser);
         this.deleted = true;
         List<DeleteHistory> deleteHistories = new ArrayList<>();
-        deleteHistories.add(new DeleteHistory(ContentType.QUESTION, id, writer, LocalDateTime.now()));
+        deleteHistories.add(DeleteHistory.deleteQuestion(id, writer));
         deleteHistories.addAll(answers.deleteAll());
         return deleteHistories;
     }

From 1b7b8abbc05dc6d4d74bd34068018f3349b2c574 Mon Sep 17 00:00:00 2001
From: yang Jiyoung <0112jyoung@naver.com>
Date: Sun, 13 Apr 2025 09:04:34 +0900
Subject: [PATCH 14/15] =?UTF-8?q?[refactor]=20=EC=A7=88=EB=AC=B8=20?=
 =?UTF-8?q?=EC=82=AD=EC=A0=9C=20=EC=8B=9C=20validation=20=EC=B6=94?=
 =?UTF-8?q?=EA=B0=80?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 src/main/java/nextstep/qna/domain/Answer.java   | 12 ++++++++++--
 src/main/java/nextstep/qna/domain/Answers.java  | 17 +++++++----------
 src/main/java/nextstep/qna/domain/Question.java |  8 +-------
 .../java/nextstep/qna/domain/AnswerTest.java    |  5 +++--
 .../java/nextstep/qna/domain/AnswersTest.java   | 12 +++++++-----
 5 files changed, 28 insertions(+), 26 deletions(-)

diff --git a/src/main/java/nextstep/qna/domain/Answer.java b/src/main/java/nextstep/qna/domain/Answer.java
index a9ccc9d2c1..0f8afb8bd9 100644
--- a/src/main/java/nextstep/qna/domain/Answer.java
+++ b/src/main/java/nextstep/qna/domain/Answer.java
@@ -1,5 +1,6 @@
 package nextstep.qna.domain;
 
+import nextstep.qna.CannotDeleteException;
 import nextstep.qna.NotFoundException;
 import nextstep.qna.UnAuthorizedException;
 import nextstep.users.domain.NsUser;
@@ -51,7 +52,7 @@ public boolean isDeleted() {
         return deleted;
     }
 
-    public boolean isOwner(NsUser writer) {
+    private boolean isOwner(NsUser writer) {
         return this.writer.equals(writer);
     }
 
@@ -68,8 +69,15 @@ public String toString() {
         return "Answer [id=" + getId() + ", writer=" + writer + ", contents=" + contents + "]";
     }
 
-    public DeleteHistory delete() {
+    public DeleteHistory delete(NsUser loginUser) throws CannotDeleteException {
+        canDeleteBy(loginUser);
         this.deleted = true;
         return DeleteHistory.deleteAnswer(id, writer);
     }
+
+    private void canDeleteBy(NsUser loginUser) throws CannotDeleteException {
+        if (!isOwner(loginUser)) {
+            throw new CannotDeleteException("다른 사람이 쓴 답변이 있어 삭제할 수 없습니다.");
+        }
+    }
 }
diff --git a/src/main/java/nextstep/qna/domain/Answers.java b/src/main/java/nextstep/qna/domain/Answers.java
index e074a2354a..a41addb555 100644
--- a/src/main/java/nextstep/qna/domain/Answers.java
+++ b/src/main/java/nextstep/qna/domain/Answers.java
@@ -1,10 +1,10 @@
 package nextstep.qna.domain;
 
+import nextstep.qna.CannotDeleteException;
 import nextstep.users.domain.NsUser;
 
 import java.util.ArrayList;
 import java.util.List;
-import java.util.stream.Collectors;
 
 public class Answers {
     private List<Answer> answers;
@@ -21,14 +21,11 @@ public void add(Answer answer) {
         answers.add(answer);
     }
 
-    public boolean isAllAnswerOwner(NsUser loginUser) {
-        return answers.stream()
-                .allMatch(answer -> answer.isOwner(loginUser));
-    }
-
-    public List<DeleteHistory> deleteAll() {
-        return answers.stream()
-                .map(Answer::delete)
-                .collect(Collectors.toList());
+    public List<DeleteHistory> deleteAll(NsUser loginUser) throws CannotDeleteException {
+        List<DeleteHistory> deleteHistories = new ArrayList<>();
+        for (Answer answer : answers) {
+            deleteHistories.add(answer.delete(loginUser));
+        }
+        return deleteHistories;
     }
 }
diff --git a/src/main/java/nextstep/qna/domain/Question.java b/src/main/java/nextstep/qna/domain/Question.java
index 02cf57e004..c276d5310f 100644
--- a/src/main/java/nextstep/qna/domain/Question.java
+++ b/src/main/java/nextstep/qna/domain/Question.java
@@ -70,7 +70,7 @@ public List<DeleteHistory> delete(NsUser loginUser) throws CannotDeleteException
         this.deleted = true;
         List<DeleteHistory> deleteHistories = new ArrayList<>();
         deleteHistories.add(DeleteHistory.deleteQuestion(id, writer));
-        deleteHistories.addAll(answers.deleteAll());
+        deleteHistories.addAll(answers.deleteAll(loginUser));
         return deleteHistories;
     }
 
@@ -78,11 +78,5 @@ private void checkValidDeleteUser(NsUser loginUser) throws CannotDeleteException
         if (!isOwner(loginUser)) {
             throw new CannotDeleteException("질문을 삭제할 권한이 없습니다.");
         }
-
-        if (!answers.isAllAnswerOwner(loginUser)) {
-            throw new CannotDeleteException("다른 사람이 쓴 답변이 있어 삭제할 수 없습니다.");
-        }
     }
-
-
 }
diff --git a/src/test/java/nextstep/qna/domain/AnswerTest.java b/src/test/java/nextstep/qna/domain/AnswerTest.java
index e5b5da8292..eceb9f1f95 100644
--- a/src/test/java/nextstep/qna/domain/AnswerTest.java
+++ b/src/test/java/nextstep/qna/domain/AnswerTest.java
@@ -1,5 +1,6 @@
 package nextstep.qna.domain;
 
+import nextstep.qna.CannotDeleteException;
 import nextstep.users.domain.NsUserTest;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.DisplayName;
@@ -20,8 +21,8 @@ public void init() {
 
     @Test
     @DisplayName("delete를 통해 answer은 삭제 상태가 된다.")
-    public void delete() {
-        A1.delete();
+    public void delete() throws CannotDeleteException {
+        A1.delete(NsUserTest.JAVAJIGI);
         assertThat(A1.isDeleted()).isTrue();
     }
 }
diff --git a/src/test/java/nextstep/qna/domain/AnswersTest.java b/src/test/java/nextstep/qna/domain/AnswersTest.java
index 352ebfee4c..02f66b82ab 100644
--- a/src/test/java/nextstep/qna/domain/AnswersTest.java
+++ b/src/test/java/nextstep/qna/domain/AnswersTest.java
@@ -1,5 +1,6 @@
 package nextstep.qna.domain;
 
+import nextstep.qna.CannotDeleteException;
 import nextstep.users.domain.NsUserTest;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.DisplayName;
@@ -7,7 +8,7 @@
 
 import java.util.List;
 
-import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
 
 class AnswersTest {
     Answer A1;
@@ -24,16 +25,17 @@ public void init() {
     }
 
     @Test
-    @DisplayName("답변의 작성자가 전부 같지 않으면 false을 반환한다.")
+    @DisplayName("답변의 작성자가 전부 같지 않으면 에러를 반환한다.")
     void isAllAnswerOwner_false() {
         Answers answers = new Answers(List.of(A1, A2, A3));
-        assertThat(answers.isAllAnswerOwner(NsUserTest.JAVAJIGI)).isFalse();
+        assertThatThrownBy(() -> answers.deleteAll(NsUserTest.JAVAJIGI))
+                .isInstanceOf(CannotDeleteException.class);
     }
 
     @Test
     @DisplayName("답변의 작성자가 전부 같으면 true 반환한다.")
-    void isAllAnswerOwner_true() {
+    void isAllAnswerOwner_true() throws CannotDeleteException {
         Answers answers = new Answers(List.of(A1, A3));
-        assertThat(answers.isAllAnswerOwner(NsUserTest.JAVAJIGI)).isTrue();
+        answers.deleteAll(NsUserTest.JAVAJIGI);
     }
 }
\ No newline at end of file

From 460de6b39b7b15d5e97ebf8b0e6877ea3af63547 Mon Sep 17 00:00:00 2001
From: yang Jiyoung <0112jyoung@naver.com>
Date: Sun, 13 Apr 2025 09:16:17 +0900
Subject: [PATCH 15/15] =?UTF-8?q?[refactor]=20=EC=9D=B4=EB=AF=B8=EC=A7=80,?=
 =?UTF-8?q?=20=EB=93=B1=EB=A1=9D=20=EC=8B=9C=20=EC=98=88=EC=99=B8=20?=
 =?UTF-8?q?=EC=B6=94=EA=B0=80?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../java/nextstep/courses/CannotEnrollException.java  |  7 +++++++
 .../java/nextstep/courses/InvalidImageException.java  | 11 +++++++++++
 .../java/nextstep/courses/domain/session/Session.java |  3 ++-
 .../courses/domain/session/SessionCapacity.java       |  4 +++-
 .../nextstep/courses/domain/session/SessionImage.java |  8 +++++---
 .../courses/domain/session/SessionImageType.java      |  4 +++-
 .../courses/domain/session/EnrollmentTest.java        |  3 ++-
 .../courses/domain/session/SessionCapacityTest.java   |  5 +++--
 .../courses/domain/session/SessionImageTest.java      |  7 ++++---
 .../courses/domain/session/SessionImageTypeTest.java  |  3 ++-
 .../nextstep/courses/domain/session/SessionTest.java  |  7 ++++---
 11 files changed, 46 insertions(+), 16 deletions(-)
 create mode 100644 src/main/java/nextstep/courses/CannotEnrollException.java
 create mode 100644 src/main/java/nextstep/courses/InvalidImageException.java

diff --git a/src/main/java/nextstep/courses/CannotEnrollException.java b/src/main/java/nextstep/courses/CannotEnrollException.java
new file mode 100644
index 0000000000..4bea8e801c
--- /dev/null
+++ b/src/main/java/nextstep/courses/CannotEnrollException.java
@@ -0,0 +1,7 @@
+package nextstep.courses;
+
+public class CannotEnrollException extends RuntimeException {
+    public CannotEnrollException(String message) {
+        super(message);
+    }
+}
diff --git a/src/main/java/nextstep/courses/InvalidImageException.java b/src/main/java/nextstep/courses/InvalidImageException.java
new file mode 100644
index 0000000000..417c1d74f2
--- /dev/null
+++ b/src/main/java/nextstep/courses/InvalidImageException.java
@@ -0,0 +1,11 @@
+package nextstep.courses;
+
+public class InvalidImageException extends RuntimeException {
+    public InvalidImageException(String message) {
+        super(message);
+    }
+
+    public InvalidImageException(){
+
+    }
+}
diff --git a/src/main/java/nextstep/courses/domain/session/Session.java b/src/main/java/nextstep/courses/domain/session/Session.java
index 8e211b9289..5704d53917 100644
--- a/src/main/java/nextstep/courses/domain/session/Session.java
+++ b/src/main/java/nextstep/courses/domain/session/Session.java
@@ -1,5 +1,6 @@
 package nextstep.courses.domain.session;
 
+import nextstep.courses.CannotEnrollException;
 import nextstep.courses.strategy.PaymentStrategy;
 import nextstep.payments.domain.Payment;
 import nextstep.users.domain.NsUser;
@@ -23,7 +24,7 @@ public Session(SessionImage image, SessionDate date, SessionState state, Enrollm
 
     public void applySession(NsUser user, LocalDate enrollDate, Payment payment) {
         if (!canApply(enrollDate, payment)) {
-            throw new IllegalArgumentException("등록 불가능한 상태입니다.");
+            throw new CannotEnrollException("등록 불가능한 상태입니다.");
         }
         this.enrollment.enroll(user);
     }
diff --git a/src/main/java/nextstep/courses/domain/session/SessionCapacity.java b/src/main/java/nextstep/courses/domain/session/SessionCapacity.java
index f39804aba2..55203bc996 100644
--- a/src/main/java/nextstep/courses/domain/session/SessionCapacity.java
+++ b/src/main/java/nextstep/courses/domain/session/SessionCapacity.java
@@ -1,5 +1,7 @@
 package nextstep.courses.domain.session;
 
+import nextstep.courses.CannotEnrollException;
+
 import java.util.Objects;
 
 public class SessionCapacity {
@@ -49,7 +51,7 @@ public boolean equals(Object object) {
 
     private void isValidCapacity(){
         if(this.capacity > this.maxCapacity) {
-            throw new IllegalArgumentException("최대 수용 인원을 현재 인원이 초과할 수 없다.");
+            throw new CannotEnrollException("최대 수용 인원을 현재 인원이 초과할 수 없다.");
         }
     }
 }
diff --git a/src/main/java/nextstep/courses/domain/session/SessionImage.java b/src/main/java/nextstep/courses/domain/session/SessionImage.java
index 69954155fb..6ea79ab1ae 100644
--- a/src/main/java/nextstep/courses/domain/session/SessionImage.java
+++ b/src/main/java/nextstep/courses/domain/session/SessionImage.java
@@ -1,5 +1,7 @@
 package nextstep.courses.domain.session;
 
+import nextstep.courses.InvalidImageException;
+
 import java.util.Objects;
 
 public class SessionImage {
@@ -27,14 +29,14 @@ public SessionImage(int width, int height, int size, SessionImageType imageType)
 
     private void checkValidSessionImage() {
         if (this.width < MIN_WIDTH || this.height < MIN_HEIGHT) {
-            throw new IllegalArgumentException("이미지의 width는 300픽셀, height는 200픽셀 이상이어야 한다.");
+            throw new InvalidImageException("이미지의 width는 300픽셀, height는 200픽셀 이상이어야 한다.");
         }
         if ((double) this.width / this.height != WIDTH_PER_HEIGHT) {
-            throw new IllegalArgumentException("이미지의 width, height의 비율은 3:2여야 한다.");
+            throw new InvalidImageException("이미지의 width, height의 비율은 3:2여야 한다.");
         }
 
         if (this.size > MAX_IMAGE_SIZE) {
-            throw new IllegalArgumentException("이미지의 크기는 1MB 이하여야 한다.");
+            throw new InvalidImageException("이미지의 크기는 1MB 이하여야 한다.");
         }
     }
 
diff --git a/src/main/java/nextstep/courses/domain/session/SessionImageType.java b/src/main/java/nextstep/courses/domain/session/SessionImageType.java
index c52bdef779..28fbe90d32 100644
--- a/src/main/java/nextstep/courses/domain/session/SessionImageType.java
+++ b/src/main/java/nextstep/courses/domain/session/SessionImageType.java
@@ -1,5 +1,7 @@
 package nextstep.courses.domain.session;
 
+import nextstep.courses.InvalidImageException;
+
 import java.util.Arrays;
 
 public enum SessionImageType {
@@ -15,7 +17,7 @@ public static SessionImageType of(String name) {
         return Arrays.stream(values())
                 .filter(type -> type.name.equals(name))
                 .findFirst()
-                .orElseThrow(IllegalArgumentException::new);
+                .orElseThrow(InvalidImageException::new);
 
     }
 }
diff --git a/src/test/java/nextstep/courses/domain/session/EnrollmentTest.java b/src/test/java/nextstep/courses/domain/session/EnrollmentTest.java
index 2e32695b9e..f28f1f645e 100644
--- a/src/test/java/nextstep/courses/domain/session/EnrollmentTest.java
+++ b/src/test/java/nextstep/courses/domain/session/EnrollmentTest.java
@@ -1,5 +1,6 @@
 package nextstep.courses.domain.session;
 
+import nextstep.courses.CannotEnrollException;
 import nextstep.users.domain.NsUserTest;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
@@ -25,6 +26,6 @@ void enroll_fail() {
         Enrollment enrollment = new Enrollment(1);
         enrollment.enroll(NsUserTest.JAVAJIGI);
         assertThatThrownBy(() -> enrollment.enroll(NsUserTest.SANJIGI))
-                .isInstanceOf(IllegalArgumentException.class);
+                .isInstanceOf(CannotEnrollException.class);
     }
 }
\ No newline at end of file
diff --git a/src/test/java/nextstep/courses/domain/session/SessionCapacityTest.java b/src/test/java/nextstep/courses/domain/session/SessionCapacityTest.java
index af32322567..b8c956f610 100644
--- a/src/test/java/nextstep/courses/domain/session/SessionCapacityTest.java
+++ b/src/test/java/nextstep/courses/domain/session/SessionCapacityTest.java
@@ -1,5 +1,6 @@
 package nextstep.courses.domain.session;
 
+import nextstep.courses.CannotEnrollException;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
 
@@ -21,13 +22,13 @@ void increase_success() {
     void increase_fail() {
         SessionCapacity capacity = new SessionCapacity(10, 10);
         assertThatThrownBy(capacity::increase)
-                .isInstanceOf(IllegalArgumentException.class);
+                .isInstanceOf(CannotEnrollException.class);
     }
 
     @Test
     @DisplayName("초기화 시 수강인원이 최대 인원보다 크면 에러를 반환한다.")
     void init() {
         assertThatThrownBy(() -> new SessionCapacity(11, 10))
-                .isInstanceOf(IllegalArgumentException.class);
+                .isInstanceOf(CannotEnrollException.class);
     }
 }
\ No newline at end of file
diff --git a/src/test/java/nextstep/courses/domain/session/SessionImageTest.java b/src/test/java/nextstep/courses/domain/session/SessionImageTest.java
index 05cfcff19c..8bc07d7e15 100644
--- a/src/test/java/nextstep/courses/domain/session/SessionImageTest.java
+++ b/src/test/java/nextstep/courses/domain/session/SessionImageTest.java
@@ -1,5 +1,6 @@
 package nextstep.courses.domain.session;
 
+import nextstep.courses.InvalidImageException;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
 
@@ -19,20 +20,20 @@ public void init() {
     @DisplayName("이미지의 최소 크기를 넘지 못하면 에러가 발생한다.")
     public void init_invalid_heightwidth() {
         assertThatThrownBy(() -> new SessionImage(30, 20, 10, "jgp"))
-                .isInstanceOf(IllegalArgumentException.class);
+                .isInstanceOf(InvalidImageException.class);
     }
 
     @Test
     @DisplayName("이미지의 비율이 맞지 않으면 에러가 발생한다.")
     public void init_invalid_ratio() {
         assertThatThrownBy(() -> new SessionImage(20, 20, 10, "jpg"))
-                .isInstanceOf(IllegalArgumentException.class);
+                .isInstanceOf(InvalidImageException.class);
     }
 
     @Test
     @DisplayName("이미지의 크기가 1mb보다 크면 에러가 발생한다.")
     public void init_invalid_size() {
         assertThatThrownBy(() -> new SessionImage(30, 20, 10000000, "jgp"))
-                .isInstanceOf(IllegalArgumentException.class);
+                .isInstanceOf(InvalidImageException.class);
     }
 }
\ No newline at end of file
diff --git a/src/test/java/nextstep/courses/domain/session/SessionImageTypeTest.java b/src/test/java/nextstep/courses/domain/session/SessionImageTypeTest.java
index 860d024f32..2668aa1d1b 100644
--- a/src/test/java/nextstep/courses/domain/session/SessionImageTypeTest.java
+++ b/src/test/java/nextstep/courses/domain/session/SessionImageTypeTest.java
@@ -1,5 +1,6 @@
 package nextstep.courses.domain.session;
 
+import nextstep.courses.InvalidImageException;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
 
@@ -19,6 +20,6 @@ void of() {
     @DisplayName("등록되지 않은 확장자를 넣으면 에러를 반환한다.")
     void of_fail() {
         assertThatThrownBy(() -> SessionImageType.of("xls"))
-                .isInstanceOf(IllegalArgumentException.class);
+                .isInstanceOf(InvalidImageException.class);
     }
 }
\ No newline at end of file
diff --git a/src/test/java/nextstep/courses/domain/session/SessionTest.java b/src/test/java/nextstep/courses/domain/session/SessionTest.java
index ae1af06805..2d05d568aa 100644
--- a/src/test/java/nextstep/courses/domain/session/SessionTest.java
+++ b/src/test/java/nextstep/courses/domain/session/SessionTest.java
@@ -1,5 +1,6 @@
 package nextstep.courses.domain.session;
 
+import nextstep.courses.CannotEnrollException;
 import nextstep.courses.strategy.FreePaymentStrategy;
 import nextstep.courses.strategy.PaidPaymentStrategy;
 import nextstep.payments.domain.Payment;
@@ -48,7 +49,7 @@ void applySessionFailByState() {
         FreePaymentStrategy freePaymentStrategy = new FreePaymentStrategy();
         Session session = new Session(image, date, SessionState.PREPARING, enrollment, freePaymentStrategy);
         assertThatThrownBy(() -> session.applySession(NsUserTest.JAVAJIGI, LocalDate.now(), new Payment()))
-                .isInstanceOf(IllegalArgumentException.class);
+                .isInstanceOf(CannotEnrollException.class);
     }
 
     @Test
@@ -57,7 +58,7 @@ void applySessionFailByDate() {
         FreePaymentStrategy freePaymentStrategy = new FreePaymentStrategy();
         Session session = new Session(image, date, state, enrollment, freePaymentStrategy);
         assertThatThrownBy(() -> session.applySession(NsUserTest.JAVAJIGI, LocalDate.now().plusDays(10), new Payment()))
-                .isInstanceOf(IllegalArgumentException.class);
+                .isInstanceOf(CannotEnrollException.class);
     }
 
     @Test
@@ -66,6 +67,6 @@ void applySessionFailByPayment() {
         PaidPaymentStrategy paidPaymentStrategy = new PaidPaymentStrategy(1000L);
         Session session = new Session(image, date, state, enrollment, paidPaymentStrategy);
         assertThatThrownBy(() -> session.applySession(NsUserTest.JAVAJIGI, LocalDate.now(), new Payment("1L", 1L, 1L, 2000L)))
-                .isInstanceOf(IllegalArgumentException.class);
+                .isInstanceOf(CannotEnrollException.class);
     }
 }
\ No newline at end of file