diff --git a/internal/service/tests/chat_service_test.go b/internal/service/tests/chat_service_test.go
new file mode 100644
index 00000000..7e4fffa2
--- /dev/null
+++ b/internal/service/tests/chat_service_test.go
@@ -0,0 +1,186 @@
+package service
+
+import (
+	"context"
+	"testing"
+
+	"github.com/pet-sitter/pets-next-door-api/internal/domain/chat"
+	"github.com/pet-sitter/pets-next-door-api/internal/domain/media"
+	"github.com/pet-sitter/pets-next-door-api/internal/tests"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestCreateRoom(t *testing.T) {
+	t.Run("채팅방을 생성한다", func(t *testing.T) {
+		db, tearDown := tests.SetUp(t)
+		defer tearDown(t)
+		ctx := context.Background()
+		chatService := tests.NewMockChatService(db)
+
+		// Given
+		roomName := "Test Room"
+		roomType := chat.RoomType(chat.RoomTypePersonal)
+
+		// When
+		createdRoom, err := chatService.CreateRoom(ctx, roomName, roomType)
+
+		// Then
+		assert.NoError(t, err)
+		assert.Equal(t, roomName, createdRoom.Name)
+		assert.Equal(t, roomType, createdRoom.RoomType)
+	})
+}
+
+func TestJoinRoom(t *testing.T) {
+	t.Run("채팅방에 입장한다", func(t *testing.T) {
+		db, tearDown := tests.SetUp(t)
+		defer tearDown(t)
+		ctx := context.Background()
+		chatService := tests.NewMockChatService(db)
+		mediaService := tests.NewMockMediaService(db)
+		userService := tests.NewMockUserService(db)
+
+		// Given
+		profileImage, _ := mediaService.UploadMedia(ctx, nil, media.TypeImage, "profile_image.jpg")
+
+		userRequest := tests.NewDummyRegisterUserRequest(&profileImage.ID)
+		createdUser, _ := userService.RegisterUser(ctx, userRequest)
+
+		roomName := "Test Room"
+		roomType := chat.RoomType(chat.RoomTypePersonal)
+		createdRoom, _ := chatService.CreateRoom(ctx, roomName, roomType)
+
+		// When
+		joinRoomView, err := chatService.JoinRoom(ctx, createdRoom.ID, createdUser.FirebaseUID)
+
+		// Then
+		assert.NoError(t, err)
+		assert.Equal(t, createdRoom.ID, joinRoomView.RoomID)
+		assert.Equal(t, createdUser.ID, joinRoomView.UserID)
+	})
+}
+
+func TestLeaveRoom(t *testing.T) {
+	t.Run("채팅방을 떠난다", func(t *testing.T) {
+		db, tearDown := tests.SetUp(t)
+		defer tearDown(t)
+		ctx := context.Background()
+		chatService := tests.NewMockChatService(db)
+		mediaService := tests.NewMockMediaService(db)
+		userService := tests.NewMockUserService(db)
+
+		// Given
+		profileImage, _ := mediaService.UploadMedia(ctx, nil, media.TypeImage, "profile_image.jpg")
+
+		userRequest := tests.NewDummyRegisterUserRequest(&profileImage.ID)
+		createdUser, _ := userService.RegisterUser(ctx, userRequest)
+
+		roomName := "Test Room"
+		roomType := chat.RoomType(chat.RoomTypePersonal)
+		createdRoom, _ := chatService.CreateRoom(ctx, roomName, roomType)
+		_, _ = chatService.JoinRoom(ctx, createdRoom.ID, createdUser.FirebaseUID)
+
+		// When
+		leaveRoomErr := chatService.LeaveRoom(ctx, createdRoom.ID, createdUser.FirebaseUID)
+
+		// Then
+		assert.NoError(t, leaveRoomErr)
+	})
+}
+
+func TestSaveMessage(t *testing.T) {
+	t.Run("메시지를 저장한다", func(t *testing.T) {
+		db, tearDown := tests.SetUp(t)
+		defer tearDown(t)
+		ctx := context.Background()
+		chatService := tests.NewMockChatService(db)
+		mediaService := tests.NewMockMediaService(db)
+		userService := tests.NewMockUserService(db)
+
+		// Given
+		profileImage, _ := mediaService.UploadMedia(ctx, nil, media.TypeImage, "profile_image.jpg")
+
+		userRequest := tests.NewDummyRegisterUserRequest(&profileImage.ID)
+		createdUser, _ := userService.RegisterUser(ctx, userRequest)
+
+		roomName := "Test Room"
+		roomType := chat.RoomType(chat.RoomTypePersonal)
+		createdRoom, _ := chatService.CreateRoom(ctx, roomName, roomType)
+		_, _ = chatService.JoinRoom(ctx, createdRoom.ID, createdUser.FirebaseUID)
+
+		// When
+		message := "Hello, World!"
+		savedMessage, err := chatService.SaveMessage(
+			ctx, createdRoom.ID, createdUser.FirebaseUID, message, chat.MessageTypeNormal,
+		)
+
+		// Then
+		assert.NoError(t, err)
+		assert.Equal(t, createdRoom.ID, savedMessage.RoomID)
+		assert.Equal(t, createdUser.ID, savedMessage.UserID)
+		assert.Equal(t, message, savedMessage.Content)
+	})
+}
+
+func TestFindRoomByID(t *testing.T) {
+	t.Run("채팅방을 ID로 조회한다", func(t *testing.T) {
+		db, tearDown := tests.SetUp(t)
+		defer tearDown(t)
+		ctx := context.Background()
+		chatService := tests.NewMockChatService(db)
+
+		// Given
+		roomName := "Test Room"
+		roomType := chat.RoomType(chat.RoomTypePersonal)
+		createdRoom, _ := chatService.CreateRoom(ctx, roomName, roomType)
+
+		// When
+		foundRoom, err := chatService.FindRoomByID(ctx, &createdRoom.ID)
+
+		// Then
+		assert.NoError(t, err)
+		assert.Equal(t, createdRoom.ID, foundRoom.ID)
+		assert.Equal(t, createdRoom.Name, foundRoom.Name)
+	})
+}
+
+func TestFindUserChatRoom(t *testing.T) {
+	t.Run("사용자의 채팅방 참여 목록을 조회한다", func(t *testing.T) {
+		db, tearDown := tests.SetUp(t)
+		defer tearDown(t)
+		ctx := context.Background()
+		chatService := tests.NewMockChatService(db)
+		mediaService := tests.NewMockMediaService(db)
+		userService := tests.NewMockUserService(db)
+
+		// Given
+		profileImage, _ := mediaService.UploadMedia(ctx, nil, media.TypeImage, "profile_image.jpg")
+
+		userRequest := tests.NewDummyRegisterUserRequest(&profileImage.ID)
+		createdUser, _ := userService.RegisterUser(ctx, userRequest)
+
+		roomName := "Test Room"
+		roomType := chat.RoomType(chat.RoomTypePersonal)
+		createdRoom, _ := chatService.CreateRoom(ctx, roomName, roomType)
+
+		_, _ = chatService.JoinRoom(ctx, createdRoom.ID, createdUser.FirebaseUID)
+
+		// When
+		userChatRooms, err := chatService.FindUserChatRoom(ctx)
+
+		// Then
+		assert.NoError(t, err)
+		assert.NotEmpty(t, userChatRooms)
+
+		for _, userChatRoom := range userChatRooms {
+			if userChatRoom.RoomID == createdRoom.ID && userChatRoom.UserID == createdUser.ID {
+				assert.Equal(t, createdRoom.ID, userChatRoom.RoomInfo.ID)
+				assert.Equal(t, roomName, userChatRoom.RoomInfo.Name)
+				assert.Equal(t, roomType, userChatRoom.RoomInfo.RoomType)
+				assert.Equal(t, createdUser.Email, userChatRoom.UserInfo.Email)
+				assert.Equal(t, createdUser.Nickname, userChatRoom.UserInfo.Nickname)
+				assert.Equal(t, profileImage.URL, *userChatRoom.UserInfo.ProfileImageURL)
+			}
+		}
+	})
+}
diff --git a/internal/tests/service.go b/internal/tests/service.go
index 5da877ea..8b1b8a17 100644
--- a/internal/tests/service.go
+++ b/internal/tests/service.go
@@ -38,6 +38,10 @@ func NewMockSOSPostService(db *database.DB) *service.SOSPostService {
 	return service.NewSOSPostService(db)
 }
 
+func NewMockChatService(db *database.DB) *service.ChatService {
+	return service.NewChatService(db)
+}
+
 func AddDummyPet(
 	t *testing.T,
 	ctx context.Context,