diff --git a/gradle.properties b/gradle.properties
index 5dbe19dc28..4ee270c3ab 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,3 +1,4 @@
 org.gradle.jvmargs=-Dfile.encoding=UTF-8
 org.gradle.console=plain
-org.gradle.java.home=/opt/homebrew/Cellar/openjdk@11/11.0.26/libexec/openjdk.jdk/Contents/Home
\ No newline at end of file
+org.gradle.java.home=/opt/homebrew/Cellar/openjdk@11/11.0.26/libexec/openjdk.jdk/Contents/Home
+# 넵, 위 설정은 IDE 에서 Java 실행 환경을 위해 필요합니다.
\ No newline at end of file
diff --git a/src/main/java/nextstep/README.md b/src/main/java/nextstep/README.md
index 1bdd624aa3..b40185ac6f 100644
--- a/src/main/java/nextstep/README.md
+++ b/src/main/java/nextstep/README.md
@@ -9,3 +9,27 @@
 - [x] QnaService의 비지니스 로직을 도메인 모델로 이동하는 리팩터링을 진행할 때 TDD로 구현한다.
 - [x] QnaService의 deleteQuestion() 메서드에 대한 단위 테스트는 src/test/java 폴더 nextstep.qna.service.QnaServiceTest이다.
 - [x]도메인 모델로 로직을 이동한 후에도 QnaServiceTest의 모든 테스트는 통과해야 한다.
+
+## # Step1 피드백
+
+- [x] `gradle.properties` 의 "org.gradle.java.home" 문의
+- [x] "answers" 를 관리하는 일급컬렉션 추가
+- [x] 테스트 이름 구체적으로 명시
+
+## # Step2 요구사항
+
+- [x] 과정(Course)은 기수 단위로 운영하며, 여러 개의 강의(Session)를 가질 수 있다.
+- [x] 강의는 시작일과 종료일을 가진다.
+- [x] 강의는 강의 커버 이미지 정보를 가진다.
+  - [x] 이미지 크기는 1MB 이하여야 한다.
+  - [x] 이미지 타입은 gif, jpg(jpeg 포함), png, svg 만 허용한다.
+  - [x] 이미지의 width는 300픽셀, height는 200픽셀 이상이어야 하며, width와 height의 비율은 3:2여야 한다.
+- [x] 강의는 무료 강의와 유료 강으로 나뉜다.
+  - [x] 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] 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.
+  * 결제를 완료한 결제 정보는 payments 모듈을 통해 관리되며, 결제 정보는 Payment 객체에 담겨 반환된다.
diff --git a/src/main/java/nextstep/courses/domain/AttendeeList.java b/src/main/java/nextstep/courses/domain/AttendeeList.java
new file mode 100644
index 0000000000..8bb731462c
--- /dev/null
+++ b/src/main/java/nextstep/courses/domain/AttendeeList.java
@@ -0,0 +1,22 @@
+package nextstep.courses.domain;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import nextstep.users.domain.NsUser;
+
+public class AttendeeList {
+    private final List<NsUser> attendees;
+
+    public AttendeeList() {
+        this.attendees = new ArrayList<>();
+    }
+
+    public void add(NsUser attendee) {
+        attendees.add(attendee);
+    }    
+
+    public Long size() {
+        return (long) attendees.size();
+    }
+}
diff --git a/src/main/java/nextstep/courses/domain/Course.java b/src/main/java/nextstep/courses/domain/Course.java
index 0f69716043..df1f994e68 100644
--- a/src/main/java/nextstep/courses/domain/Course.java
+++ b/src/main/java/nextstep/courses/domain/Course.java
@@ -1,5 +1,6 @@
 package nextstep.courses.domain;
 
+import java.awt.image.BufferedImage;
 import java.time.LocalDateTime;
 
 public class Course {
@@ -13,19 +14,43 @@ public class Course {
 
     private LocalDateTime updatedAt;
 
+    private SessionList sessions;
+
+    private String courseCoverImageFilePath;
+
+    private CourseCoverImage courseCoverImage;
+
+    private Long maxAttendees;
+
+    private CourseStatus courseStatus;
+
+    private AttendeeList attendees = new AttendeeList();
+
     public Course() {
     }
 
-    public Course(String title, Long creatorId) {
-        this(0L, title, creatorId, LocalDateTime.now(), null);
+    public Course(String title, Long creatorId, String courseCoverImageFilePath, Long maxAttendees) {
+        this(0L, title, creatorId, LocalDateTime.now(), null, courseCoverImageFilePath, maxAttendees, CourseStatus.PREPARING);
+    }
+
+    public Course(String title, Long creatorId, String courseCoverImageFilePath, Long maxAttendees, CourseStatus courseStatus) {
+        this(0L, title, creatorId, LocalDateTime.now(), null, courseCoverImageFilePath, maxAttendees, courseStatus);
     }
 
-    public Course(Long id, String title, Long creatorId, LocalDateTime createdAt, LocalDateTime updatedAt) {
+    public Course(Long id, String title, Long creatorId, LocalDateTime createdAt, LocalDateTime updatedAt, String courseCoverImageFilePath, Long maxAttendees, CourseStatus courseStatus) {
         this.id = id;
         this.title = title;
         this.creatorId = creatorId;
         this.createdAt = createdAt;
         this.updatedAt = updatedAt;
+        this.courseCoverImageFilePath = courseCoverImageFilePath;
+        this.courseCoverImage = new CourseCoverImage(courseCoverImageFilePath);
+        this.maxAttendees = maxAttendees;
+        this.courseStatus = courseStatus;
+    }
+
+    public AttendeeList getAttendees() {
+        return attendees;
     }
 
     public String getTitle() {
@@ -40,6 +65,14 @@ public LocalDateTime getCreatedAt() {
         return createdAt;
     }
 
+    public Long getMaxAttendees() {
+        return maxAttendees;
+    }
+
+    public CourseStatus getCourseStatus() {
+        return courseStatus;
+    }
+
     @Override
     public String toString() {
         return "Course{" +
diff --git a/src/main/java/nextstep/courses/domain/CourseCoverImage.java b/src/main/java/nextstep/courses/domain/CourseCoverImage.java
new file mode 100644
index 0000000000..5e6a50e7eb
--- /dev/null
+++ b/src/main/java/nextstep/courses/domain/CourseCoverImage.java
@@ -0,0 +1,59 @@
+package nextstep.courses.domain;
+
+import java.awt.image.BufferedImage;
+import java.io.File;
+import java.io.IOException;
+import java.net.URI;
+import java.util.Arrays;
+
+import javax.imageio.ImageIO;
+
+public class CourseCoverImage {
+
+    private static final String[] SUPPORTED_IMAGE_EXTENSIONS = {".gif", ".jpg", ".jpeg", ".png", ".svg"};
+    private static final int MIN_WIDTH = 300;
+    private static final int MIN_HEIGHT = 200;
+    private static final String DEFAULT_IMAGE_FILE_PATH = "src/test/resources/images/default.jpg";
+
+    private String imageFilePath;
+    private File imageFile;
+
+    private BufferedImage courseCoverImageData;
+
+    public CourseCoverImage(String imageFilePath) {
+        validateImage(imageFilePath);
+        this.imageFilePath = imageFilePath;
+    }
+
+    private void validateImage(String imageFilePath) {
+        if (imageFilePath == null) {
+            imageFilePath = DEFAULT_IMAGE_FILE_PATH;
+        }
+
+        if (Arrays.stream(SUPPORTED_IMAGE_EXTENSIONS).noneMatch(imageFilePath::endsWith)) {
+            throw new IllegalArgumentException("지원하지 않는 이미지 형식입니다. (지원 형식: gif, jpg, jpeg, png, svg)");
+        }
+
+        try {
+            imageFile = new File(imageFilePath);
+            if (!imageFile.exists()) {
+                throw new IllegalArgumentException("강의 커버 이미지를 읽을 수 없습니다.");
+            }
+        } catch (Exception e) {
+            throw new IllegalArgumentException("강의 커버 이미지를 읽을 수 없습니다.");
+        }
+
+        try {
+            courseCoverImageData = ImageIO.read(imageFile);
+            if (courseCoverImageData == null) {
+                throw new IllegalArgumentException("강의 커버 이미지를 읽을 수 없습니다.");
+            }
+        } catch (Exception e) {
+            throw new IllegalArgumentException("강의 커버 이미지를 읽을 수 없습니다.");
+        }
+
+        if (courseCoverImageData.getWidth() < MIN_WIDTH || courseCoverImageData.getHeight() < MIN_HEIGHT) {
+            throw new IllegalArgumentException("강의 커버 이미지는 최소 300x200 픽셀 이상이어야 합니다.");
+        }
+    }
+}
diff --git a/src/main/java/nextstep/courses/domain/CourseFree.java b/src/main/java/nextstep/courses/domain/CourseFree.java
new file mode 100644
index 0000000000..2d4fcdf786
--- /dev/null
+++ b/src/main/java/nextstep/courses/domain/CourseFree.java
@@ -0,0 +1,20 @@
+package nextstep.courses.domain;
+
+import java.time.LocalDateTime;
+
+public class CourseFree extends Course {
+
+    public static final Long MAX_ATTENDEES = Long.MAX_VALUE;
+
+    public CourseFree(String title, Long creatorId, String courseCoverImageFilePath) {
+        super(title, creatorId, courseCoverImageFilePath, MAX_ATTENDEES);
+    }
+
+    public CourseFree(Long id, String title, Long creatorId, LocalDateTime createdAt, LocalDateTime updatedAt, String courseCoverImageFilePath) {
+        super(id, title, creatorId, createdAt, updatedAt, courseCoverImageFilePath, MAX_ATTENDEES, CourseStatus.PREPARING);
+    }
+
+    public CourseFree(Long id, String title, Long creatorId, LocalDateTime createdAt, LocalDateTime updatedAt, String courseCoverImageFilePath, CourseStatus courseStatus) {
+        super(id, title, creatorId, createdAt, updatedAt, courseCoverImageFilePath, MAX_ATTENDEES, courseStatus);
+    }
+}
diff --git a/src/main/java/nextstep/courses/domain/CoursePaid.java b/src/main/java/nextstep/courses/domain/CoursePaid.java
new file mode 100644
index 0000000000..da6461089b
--- /dev/null
+++ b/src/main/java/nextstep/courses/domain/CoursePaid.java
@@ -0,0 +1,19 @@
+package nextstep.courses.domain;
+
+import java.time.LocalDateTime;
+
+public class CoursePaid extends Course {
+
+    public CoursePaid(String title, Long creatorId, String courseCoverImageFilePath, Long maxAttendees) {
+        super(title, creatorId, courseCoverImageFilePath, maxAttendees);
+    }
+    
+    public CoursePaid(Long id, String title, Long creatorId, LocalDateTime createdAt, LocalDateTime updatedAt, String courseCoverImageFilePath, Long maxAttendees) {
+        super(id, title, creatorId, createdAt, updatedAt, courseCoverImageFilePath, maxAttendees, CourseStatus.PREPARING);
+    }
+
+    public CoursePaid(Long id, String title, Long creatorId, LocalDateTime createdAt, LocalDateTime updatedAt, String courseCoverImageFilePath, Long maxAttendees, CourseStatus courseStatus) {
+        super(id, title, creatorId, createdAt, updatedAt, courseCoverImageFilePath, maxAttendees, courseStatus);
+    }
+    
+}
diff --git a/src/main/java/nextstep/courses/domain/CourseStatus.java b/src/main/java/nextstep/courses/domain/CourseStatus.java
new file mode 100644
index 0000000000..6977655c8f
--- /dev/null
+++ b/src/main/java/nextstep/courses/domain/CourseStatus.java
@@ -0,0 +1,7 @@
+package nextstep.courses.domain;
+
+public enum CourseStatus {
+    PREPARING,
+    RECRUITING,
+    ENDED
+}
diff --git a/src/main/java/nextstep/courses/domain/Session.java b/src/main/java/nextstep/courses/domain/Session.java
new file mode 100644
index 0000000000..bb9db13a65
--- /dev/null
+++ b/src/main/java/nextstep/courses/domain/Session.java
@@ -0,0 +1,5 @@
+package nextstep.courses.domain;
+
+public class Session {
+    
+}
diff --git a/src/main/java/nextstep/courses/domain/SessionList.java b/src/main/java/nextstep/courses/domain/SessionList.java
new file mode 100644
index 0000000000..0a100317af
--- /dev/null
+++ b/src/main/java/nextstep/courses/domain/SessionList.java
@@ -0,0 +1,5 @@
+package nextstep.courses.domain;
+
+public class SessionList {
+    
+}
diff --git a/src/main/java/nextstep/courses/infrastructure/JdbcCourseRepository.java b/src/main/java/nextstep/courses/infrastructure/JdbcCourseRepository.java
index f9122cbe33..2e15d567b0 100644
--- a/src/main/java/nextstep/courses/infrastructure/JdbcCourseRepository.java
+++ b/src/main/java/nextstep/courses/infrastructure/JdbcCourseRepository.java
@@ -31,7 +31,11 @@ public Course findById(Long id) {
                 rs.getString(2),
                 rs.getLong(3),
                 toLocalDateTime(rs.getTimestamp(4)),
-                toLocalDateTime(rs.getTimestamp(5)));
+                toLocalDateTime(rs.getTimestamp(5)),
+                null, // courseCoverImageFilePath
+                null, // maxAttendees
+                null // courseStatus
+        );
         return jdbcTemplate.queryForObject(sql, rowMapper, id);
     }
 
diff --git a/src/main/java/nextstep/qna/domain/AnswerList.java b/src/main/java/nextstep/qna/domain/AnswerList.java
new file mode 100644
index 0000000000..9a85e7b281
--- /dev/null
+++ b/src/main/java/nextstep/qna/domain/AnswerList.java
@@ -0,0 +1,31 @@
+package nextstep.qna.domain;
+
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+
+public class AnswerList implements Iterable<Answer> {
+    
+    private final List<Answer> answers;
+
+    public AnswerList() {
+        this.answers = new ArrayList<>();
+    }
+
+    public AnswerList(List<Answer> answers) {
+        this.answers = answers;
+    }
+
+    public List<Answer> getAnswers() {
+        return answers;
+    }
+
+    public void add(Answer answer) {
+        answers.add(answer);
+    }
+    
+    @Override
+    public Iterator<Answer> iterator() {
+        return answers.iterator();
+    }
+}
diff --git a/src/main/java/nextstep/qna/domain/Question.java b/src/main/java/nextstep/qna/domain/Question.java
index a448b2b0a5..248ecc5fee 100644
--- a/src/main/java/nextstep/qna/domain/Question.java
+++ b/src/main/java/nextstep/qna/domain/Question.java
@@ -16,7 +16,8 @@ public class Question {
 
     private NsUser writer;
 
-    private List<Answer> answers = new ArrayList<>();
+    // private List<Answer> answers = new ArrayList<>();
+    private AnswerList answers = new AnswerList();
 
     private boolean deleted = false;
 
@@ -96,7 +97,7 @@ public List<DeleteHistory> delete(NsUser loginUser) throws CannotDeleteException
     }
 
     public List<Answer> getAnswers() {
-        return answers;
+        return answers.getAnswers();
     }
 
     @Override
diff --git a/src/main/java/nextstep/users/domain/NsUser.java b/src/main/java/nextstep/users/domain/NsUser.java
index 62ec5138cd..0e209b710b 100755
--- a/src/main/java/nextstep/users/domain/NsUser.java
+++ b/src/main/java/nextstep/users/domain/NsUser.java
@@ -1,10 +1,14 @@
 package nextstep.users.domain;
 
-import nextstep.qna.UnAuthorizedException;
-
 import java.time.LocalDateTime;
 import java.util.Objects;
 
+import nextstep.courses.domain.Course;
+import nextstep.courses.domain.CourseFree;
+import nextstep.courses.domain.CoursePaid;
+import nextstep.courses.domain.CourseStatus;
+import nextstep.qna.UnAuthorizedException;
+
 public class NsUser {
     public static final GuestNsUser GUEST_USER = new GuestNsUser();
 
@@ -124,6 +128,22 @@ public boolean isGuestUser() {
         }
     }
 
+    public void registerCourse(Course course) {
+        if (course.getCourseStatus() == CourseStatus.PREPARING) {
+            throw new IllegalArgumentException("강의가 준비중입니다.");
+        }
+        if (course.getAttendees().size() >= course.getMaxAttendees()) {
+            throw new IllegalArgumentException("강의 수강 인원이 초과되었습니다.");
+        }
+        if (course instanceof CoursePaid) {
+            // Payment...
+            course.getAttendees().add(this);
+        }
+        if (course instanceof CourseFree) {
+            course.getAttendees().add(this);
+        }            
+    }
+
     @Override
     public String toString() {
         return "NsUser{" +
diff --git a/src/test/java/nextstep/courses/domain/CourseCoverImageTest.java b/src/test/java/nextstep/courses/domain/CourseCoverImageTest.java
new file mode 100644
index 0000000000..1afeb79263
--- /dev/null
+++ b/src/test/java/nextstep/courses/domain/CourseCoverImageTest.java
@@ -0,0 +1,97 @@
+package nextstep.courses.domain;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+import javax.imageio.ImageIO;
+import java.awt.image.BufferedImage;
+import java.io.File;
+import java.io.IOException;
+
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.junit.jupiter.api.Assertions.*;
+
+class CourseCoverImageTest {
+
+    private static final String TEST_RESOURCES_PATH = "src/test/resources/images";
+    private File validImageFile;
+    private File smallImageFile;
+    private File invalidImageFile;
+
+    @BeforeEach
+    void setUp() throws IOException {
+        // Create test resources directory if it doesn't exist
+        File testDir = new File(TEST_RESOURCES_PATH);
+        if (!testDir.exists()) {
+            testDir.mkdirs();
+        }
+
+        // Create valid image (400x300)
+        validImageFile = createTestImage(400, 300, "valid.jpg");
+        
+        // Create small image (200x150)
+        smallImageFile = createTestImage(200, 150, "small.jpg");
+        
+        // Create invalid image file (not an image)
+        invalidImageFile = new File(TEST_RESOURCES_PATH, "invalid.jpg");
+        invalidImageFile.createNewFile();
+    }
+
+    @Test
+    @DisplayName("유효한 이미지 파일로 CourseCoverImage를 생성할 수 있다")
+    void createCourseCoverImageWithValidImage() {
+        // when
+        CourseCoverImage courseCoverImage = new CourseCoverImage(validImageFile.getAbsolutePath());
+
+        // then
+        assertNotNull(courseCoverImage);
+    }
+
+    @Test
+    @DisplayName("지원하지 않는 이미지 확장자면 예외가 발생한다")
+    void throwExceptionWhenImageExtensionIsNotSupported() {
+        // when & then
+        assertThatThrownBy(() -> {
+            new CourseCoverImage("invalid.txt");
+        }).isInstanceOf(IllegalArgumentException.class)
+        .hasMessage("지원하지 않는 이미지 형식입니다. (지원 형식: gif, jpg, jpeg, png, svg)");
+    }
+
+    @Test
+    @DisplayName("이미지 파일이 존재하지 않으면 예외가 발생한다")
+    void throwExceptionWhenImageFileDoesNotExist() {
+        // when & then
+        assertThatThrownBy(() -> {
+            new CourseCoverImage("nonexistent.jpg");
+        }).isInstanceOf(IllegalArgumentException.class)
+        .hasMessage("강의 커버 이미지를 읽을 수 없습니다.");
+    }
+
+    @Test
+    @DisplayName("이미지 크기가 최소 크기보다 작으면 예외가 발생한다")
+    void throwExceptionWhenImageSizeIsTooSmall() {
+        // when & then
+        assertThatThrownBy(() -> {
+            new CourseCoverImage(smallImageFile.getAbsolutePath());
+        }).isInstanceOf(IllegalArgumentException.class)
+        .hasMessage("강의 커버 이미지는 최소 300x200 픽셀 이상이어야 합니다.");
+    }
+
+    @Test
+    @DisplayName("유효하지 않은 이미지 파일이면 예외가 발생한다")
+    void throwExceptionWhenImageFileIsInvalid() {
+        // when & then
+        assertThatThrownBy(() -> {
+            new CourseCoverImage(invalidImageFile.getAbsolutePath());
+        }).isInstanceOf(IllegalArgumentException.class)
+        .hasMessage("강의 커버 이미지를 읽을 수 없습니다.");
+    }
+
+    private File createTestImage(int width, int height, String fileName) throws IOException {
+        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
+        File imageFile = new File(TEST_RESOURCES_PATH, fileName);
+        ImageIO.write(image, "jpg", imageFile);
+        return imageFile;
+    }
+} 
\ No newline at end of file
diff --git a/src/test/java/nextstep/courses/domain/CourseFreeTest.java b/src/test/java/nextstep/courses/domain/CourseFreeTest.java
new file mode 100644
index 0000000000..d91567fe23
--- /dev/null
+++ b/src/test/java/nextstep/courses/domain/CourseFreeTest.java
@@ -0,0 +1,60 @@
+package nextstep.courses.domain;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+import javax.imageio.ImageIO;
+import java.awt.image.BufferedImage;
+import java.io.File;
+import java.io.IOException;
+import java.time.LocalDateTime;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class CourseFreeTest {
+
+    private static final String TEST_TITLE = "자바 기초 강의";
+    private static final Long TEST_CREATOR_ID = 1L;
+    private static final String TEST_RESOURCES_PATH = "src/test/resources/images";
+    private static final String TEST_COVER_IMAGE_PATH = TEST_RESOURCES_PATH + "/valid.jpg";
+    
+    private CourseFree courseFree;
+
+    @BeforeEach
+    void setUp() throws IOException {
+        // Create test resources directory if it doesn't exist
+        File testDir = new File(TEST_RESOURCES_PATH);
+        if (!testDir.exists()) {
+            testDir.mkdirs();
+        }
+
+        // Create valid image (400x300)
+        createTestImage(400, 300, "valid.jpg");
+
+        courseFree = new CourseFree(TEST_TITLE, TEST_CREATOR_ID, TEST_COVER_IMAGE_PATH);
+    }
+
+    @Test
+    @DisplayName("무료 강의를 생성 테스트")
+    void createCourseFree() {
+        // then
+        assertThat(courseFree).isNotNull();
+        assertThat(courseFree.getTitle()).isEqualTo(TEST_TITLE);
+        assertThat(courseFree.getCreatorId()).isEqualTo(TEST_CREATOR_ID);
+    }
+
+    @Test
+    @DisplayName("무료 강의는 최대 수강 인원 제한이 없음")
+    void courseFreeHasNoMaxAttendeesLimit() {
+        // then
+        assertThat(courseFree.getMaxAttendees()).isEqualTo(Long.MAX_VALUE);
+    }
+
+    private File createTestImage(int width, int height, String fileName) throws IOException {
+        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
+        File imageFile = new File(TEST_RESOURCES_PATH, fileName);
+        ImageIO.write(image, "jpg", imageFile);
+        return imageFile;
+    }
+} 
\ No newline at end of file
diff --git a/src/test/java/nextstep/courses/infrastructure/CourseRepositoryTest.java b/src/test/java/nextstep/courses/infrastructure/CourseRepositoryTest.java
index f087fc0ad2..d2619c5709 100644
--- a/src/test/java/nextstep/courses/infrastructure/CourseRepositoryTest.java
+++ b/src/test/java/nextstep/courses/infrastructure/CourseRepositoryTest.java
@@ -28,7 +28,7 @@ void setUp() {
 
     @Test
     void crud() {
-        Course course = new Course("TDD, 클린 코드 with Java", 1L);
+        Course course = new Course("TDD, 클린 코드 with Java", 1L, null, null);
         int count = courseRepository.save(course);
         assertThat(count).isEqualTo(1);
         Course savedCourse = courseRepository.findById(1L);
diff --git a/src/test/java/nextstep/qna/domain/AnswerTest.java b/src/test/java/nextstep/qna/domain/AnswerTest.java
index 49029f497b..bd540006d9 100644
--- a/src/test/java/nextstep/qna/domain/AnswerTest.java
+++ b/src/test/java/nextstep/qna/domain/AnswerTest.java
@@ -23,7 +23,7 @@ public class AnswerTest {
     }
 
     @Test
-    @DisplayName("답변 삭제 실패")
+    @DisplayName("권한이 없는 경우 답변 삭제 실패")
     public void delete_실패() throws CannotDeleteException {
         assertThatThrownBy(() -> A2.delete(NsUserTest.JAVAJIGI))
             .isInstanceOf(CannotDeleteException.class)
diff --git a/src/test/java/nextstep/qna/domain/QuestionTest.java b/src/test/java/nextstep/qna/domain/QuestionTest.java
index 958271ae39..393d301f0a 100644
--- a/src/test/java/nextstep/qna/domain/QuestionTest.java
+++ b/src/test/java/nextstep/qna/domain/QuestionTest.java
@@ -25,7 +25,7 @@ public class QuestionTest {
     }
 
     @Test
-    @DisplayName("질문 삭제 실패")
+    @DisplayName("권한이 없는 경우 질문 삭제 실패")
     public void delete_실패() throws CannotDeleteException {
         assertThatThrownBy(() -> Q2.delete(NsUserTest.JAVAJIGI))
             .isInstanceOf(CannotDeleteException.class)
diff --git a/src/test/resources/images/default.jpg b/src/test/resources/images/default.jpg
new file mode 100644
index 0000000000..42e842efa2
Binary files /dev/null and b/src/test/resources/images/default.jpg differ
diff --git a/src/test/resources/images/invalid.jpg b/src/test/resources/images/invalid.jpg
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/src/test/resources/images/invalid.txt b/src/test/resources/images/invalid.txt
new file mode 100644
index 0000000000..e466dcbd8e
--- /dev/null
+++ b/src/test/resources/images/invalid.txt
@@ -0,0 +1 @@
+invalid
\ No newline at end of file
diff --git a/src/test/resources/images/small.jpg b/src/test/resources/images/small.jpg
new file mode 100644
index 0000000000..75dc009b78
Binary files /dev/null and b/src/test/resources/images/small.jpg differ
diff --git a/src/test/resources/images/valid.jpg b/src/test/resources/images/valid.jpg
new file mode 100644
index 0000000000..42e842efa2
Binary files /dev/null and b/src/test/resources/images/valid.jpg differ