test: 워크스페이스 서비스 유닛 테스트 추가

- import userModel
- 중복 가입 에러에 대한 테스트 케이스 추가

Author: se030

server/apis/workspace/service.test.ts

@@ -1,3 +1,4 @@
+const userModel = require('@apis/user/model');
 const workspaceModel = require('./model');
 const workspaceService = require('./service');
 const { default: InvalidJoinError } = require('@errors/invalid-join-error');
@@ -57,18 +58,18 @@ describe('create', () => {
 
 describe('join', () => {
   const USER_ID = 1;
+  const WORKSPACE_ID = 1;
+  const WORKSPACE_NAME = 'Wab';
 
   it('유효한 참여코드가 주어진 경우 성공한다.', async () => {
-    const WORKSPACE_ID = 1;
-    const WORKSPACE_NAME = 'Wab';
-
     workspaceModel.findOne.mockResolvedValueOnce({
       id: WORKSPACE_ID,
       name: WORKSPACE_NAME,
       code: VALID_CODE,
       users: [],
       moms: [],
     });
+    userModel.find.mockResolvedValueOnce([{ workspaces: [] }]);
 
     expect(workspaceService.join(USER_ID, VALID_CODE)).resolves.toEqual({
       id: WORKSPACE_ID,
@@ -91,6 +92,21 @@ describe('join', () => {
     ).rejects.toThrow(InvalidJoinError);
   });
 
+  it('이미 참여한 워크스페이스인 경우 실패한다.', async () => {
+    workspaceModel.findOne.mockResolvedValueOnce({
+      id: WORKSPACE_ID,
+      name: WORKSPACE_NAME,
+      code: VALID_CODE,
+      users: [],
+      moms: [],
+    });
+    userModel.find.mockResolvedValueOnce([{ workspaces: [WORKSPACE_ID] }]);
+
+    expect(() => workspaceService.join(USER_ID, VALID_CODE)).rejects.toThrow(
+      InvalidJoinError,
+    );
+  });
+
   it('db 업데이트 중 에러가 발생하면 실패한다.', async () => {
     workspaceModel.updateOne.mockRejectedValueOnce(
       new Error('Some error in database operation'),

server/apis/workspace/service.ts

@@ -32,7 +32,7 @@ export const join = async (userId: number, code: string) => {
   )[0].workspaces;
 
   if (userWorkspaces.includes(id)) {
-    throw new Error('이미 참여한 워크스페이스에요 ^^');
+    throw new InvalidJoinError('이미 참여한 워크스페이스에요 ^^');
   }
 
   await workspaceModel.updateOne({ id }, { $addToSet: { users: userId } });