diff --git a/.github/workflows/test-ci.yaml b/.github/workflows/test-ci.yaml
index 200ec0f..41d0804 100644
--- a/.github/workflows/test-ci.yaml
+++ b/.github/workflows/test-ci.yaml
@@ -45,6 +45,16 @@ jobs:
           echo "SECRET_KEY=adsfgdsftrgdfsvdf" >> .env
           echo "DEBUG=True" >> .env
           echo "DATABASE_URL=sqlite:///db.sqlite3" >> .env
+          echo "AES_KEY_0=${{ secrets.AES_KEY_0 }}" >> .env
+          echo "AES_KEY_1=${{ secrets.AES_KEY_1 }}" >> .env
+          echo "AES_KEY_2=${{ secrets.AES_KEY_2 }}" >> .env
+          echo "AES_KEY_3=${{ secrets.AES_KEY_3 }}" >> .env
+          echo "AES_KEY_4=${{ secrets.AES_KEY_4 }}" >> .env
+          echo "AES_KEY_5=${{ secrets.AES_KEY_5 }}" >> .env
+          echo "AES_KEY_6=${{ secrets.AES_KEY_6 }}" >> .env
+          echo "AES_KEY_7=${{ secrets.AES_KEY_7 }}" >> .env
+          echo "AES_KEY_8=${{ secrets.AES_KEY_8 }}" >> .env
+          echo "AES_KEY_9=${{ secrets.AES_KEY_9 }}" >> .env
 
       - name: Run migrations
         run: poetry run python manage.py migrate
diff --git a/scraping/main.py b/scraping/main.py
index ebf98ec..24e5890 100644
--- a/scraping/main.py
+++ b/scraping/main.py
@@ -36,6 +36,10 @@ async def update_old_tokens(
         """토큰 만료로 인한 토큰 업데이트"""
         current_access_token = aes_encryption.decrypt(user.access_token)
         current_refresh_token = aes_encryption.decrypt(user.refresh_token)
+
+        if current_access_token is None or current_refresh_token is None:
+            return False
+    
         try:
             # 복호화된 토큰과 새 토큰을 비교
             if new_user_cookies["access_token"] != current_access_token:
diff --git a/scraping/tests/test_main.py b/scraping/tests/test_main.py
new file mode 100644
index 0000000..c3e1c71
--- /dev/null
+++ b/scraping/tests/test_main.py
@@ -0,0 +1,303 @@
+from unittest.mock import AsyncMock, MagicMock, patch
+from django.db import transaction
+
+import pytest
+import uuid
+
+from users.models import User
+from posts.models import Post
+from scraping.main import Scraper
+
+
+class TestScraper:
+    @pytest.fixture
+    def scraper(self):
+        """Scraper 인스턴스 생성"""
+        return Scraper(group_range=range(1, 10), max_connections=10)
+
+    @pytest.fixture
+    def user(self, db):
+        """테스트용 User 객체 생성"""
+        return User.objects.create(
+            velog_uuid=uuid.uuid4(),
+            access_token="encrypted-access-token",
+            refresh_token="encrypted-refresh-token",
+            group_id=1,
+            email="test@example.com",
+            is_active=True,
+        )
+
+    @patch("scraping.main.AESEncryption")
+    @pytest.mark.asyncio
+    async def test_update_old_tokens_success(self, mock_aes, scraper, user):
+        """토큰 업데이트 성공 테스트"""
+        mock_encryption = mock_aes.return_value
+        mock_encryption.decrypt.side_effect = lambda token: f"decrypted-{token}"
+        mock_encryption.encrypt.side_effect = lambda token: f"encrypted-{token}"
+
+        new_tokens = {
+            "access_token": "new-access-token",
+            "refresh_token": "new-refresh-token",
+        }
+
+        with patch.object(user, "asave", new_callable=AsyncMock) as mock_asave:
+            result = await scraper.update_old_tokens(user, mock_encryption, new_tokens)
+
+        assert result is True
+        mock_asave.assert_called_once()
+        assert user.access_token == "encrypted-new-access-token"
+        assert user.refresh_token == "encrypted-new-refresh-token"
+        mock_encryption.decrypt.assert_any_call("encrypted-access-token")
+        mock_encryption.decrypt.assert_any_call("encrypted-refresh-token")
+
+    @patch("scraping.main.AESEncryption")
+    @pytest.mark.asyncio
+    async def test_update_old_tokens_no_change(self, mock_aes, scraper, user):
+        """토큰 업데이트 없음 테스트"""
+        mock_encryption = mock_aes.return_value
+        mock_encryption.decrypt.side_effect = lambda token: token
+        mock_encryption.encrypt.side_effect = lambda token: f"encrypted-{token}"
+
+        new_tokens = {
+            "access_token": "encrypted-access-token",
+            "refresh_token": "encrypted-refresh-token",
+        }
+
+        with patch.object(user, "asave", new_callable=AsyncMock) as mock_asave:
+            result = await scraper.update_old_tokens(user, mock_encryption, new_tokens)
+
+        assert result is False
+        mock_asave.assert_not_called()
+
+    @patch("scraping.main.AESEncryption")
+    @pytest.mark.asyncio
+    async def test_update_old_tokens_expired_failure(self, mock_aes, scraper, user):
+        """토큰이 만료되었을 때 업데이트 실패 테스트"""
+        mock_encryption = mock_aes.return_value
+        mock_encryption.decrypt.side_effect = lambda token: f"decrypted-{token}"
+        mock_encryption.encrypt.side_effect = lambda token: f"encrypted-{token}"
+
+        new_tokens = {
+            "access_token": "decrypted-encrypted-access-token",
+            "refresh_token": "decrypted-encrypted-refresh-token",
+        }
+
+        with patch.object(user, "asave", new_callable=AsyncMock) as mock_asave:
+            result = await scraper.update_old_tokens(user, mock_encryption, new_tokens)
+
+        assert result is False
+        mock_asave.assert_not_called()
+
+    @patch("scraping.main.AESEncryption")
+    @pytest.mark.asyncio
+    async def test_update_old_tokens_with_mocked_decryption_failure(
+        self, mock_aes, scraper, user
+    ):
+        """복호화가 제대로 되지 않았을 경우 업데이트 실패 테스트"""
+        mock_encryption = mock_aes.return_value
+        mock_encryption.decrypt.side_effect = lambda token: None
+        mock_encryption.encrypt.side_effect = lambda token: f"encrypted-{token}"
+
+        new_tokens = {"access_token": "valid_token", "refresh_token": "valid_token"}
+
+        with patch.object(user, "asave", new_callable=AsyncMock) as mock_asave:
+            result = await scraper.update_old_tokens(user, mock_encryption, new_tokens)
+
+        assert result is False
+        mock_asave.assert_not_called()
+
+    @patch("scraping.main.Post.objects.bulk_create", new_callable=AsyncMock)
+    @pytest.mark.asyncio
+    async def test_bulk_insert_posts_success(self, mock_bulk_create, scraper, user):
+        """Post 객체 배치 분할 삽입 성공 테스트"""
+        posts_data = [
+            {
+                "id": f"post-{i}",
+                "title": f"Title {i}",
+                "url_slug": f"slug-{i}",
+                "released_at": "2025-03-07",
+            }
+            for i in range(50)
+        ]
+
+        result = await scraper.bulk_insert_posts(user, posts_data, batch_size=10)
+
+        assert result is True
+        mock_bulk_create.assert_called()
+        assert mock_bulk_create.call_count == 5
+
+    @patch("scraping.main.Post.objects.bulk_create", side_effect=Exception("DB 에러"))
+    @pytest.mark.asyncio
+    async def test_bulk_insert_posts_failure(self, mock_bulk_create, scraper, user):
+        """Post 객체 배치 분할 삽입 실패 테스트"""
+        posts_data = [
+            {
+                "id": f"post-{i}",
+                "title": f"Title {i}",
+                "url_slug": f"slug-{i}",
+                "released_at": "2025-03-07",
+            }
+            for i in range(10)
+        ]
+
+        result = await scraper.bulk_insert_posts(user, posts_data, batch_size=5)
+
+        assert result is False
+        mock_bulk_create.assert_called()
+
+    @pytest.mark.asyncio
+    async def test_update_daily_statistics_success(self, scraper):
+        """데일리 통계 업데이트 또는 생성 성공 테스트"""
+        post_data = {"id": "post-123"}
+        stats_data = {"data": {"getStats": {"total": 100}}, "likes": 5}
+
+        with patch(
+            "scraping.main.sync_to_async", new_callable=MagicMock
+        ) as mock_sync_to_async:
+            mock_async_func = AsyncMock()
+            mock_sync_to_async.return_value = mock_async_func
+
+            await scraper.update_daily_statistics(post_data, stats_data)
+
+            mock_sync_to_async.assert_called()
+            mock_async_func.assert_called_once()
+
+            for call_args in mock_sync_to_async.call_args_list:
+                args, kwargs = call_args
+
+                assert callable(args[0])
+
+                if kwargs:
+                    assert "post-123" in str(kwargs.get("post_data", ""))
+                    assert 100 in str(kwargs.get("stats_data", ""))
+
+    @patch("scraping.main.sync_to_async", new_callable=MagicMock)
+    @pytest.mark.asyncio
+    async def test_update_daily_statistics_exception(self, mock_sync_to_async, scraper):
+        """데일리 통계 업데이트 실패 테스트"""
+        post_data = {"id": "post-123"}
+        stats_data = {"data": {"getStats": {"total": 100}}, "likes": 5}
+
+        mock_async_func = AsyncMock(side_effect=Exception("Database error"))
+        mock_sync_to_async.return_value = mock_async_func
+
+        try:
+            await scraper.update_daily_statistics(post_data, stats_data)
+        except Exception:
+            pass
+
+        mock_sync_to_async.assert_called()
+        mock_async_func.assert_called_once()
+
+    @patch("scraping.main.fetch_post_stats")
+    @pytest.mark.asyncio
+    async def test_fetch_post_stats_limited_success(self, mock_fetch, scraper):
+        """fetch_post_stats 성공 테스트"""
+        mock_fetch.side_effect = [None, None, {"data": {"getStats": {"total": 100}}}]
+
+        result = await scraper.fetch_post_stats_limited(
+            "post-123", "token-1", "token-2"
+        )
+
+        assert result is not None
+        mock_fetch.assert_called()
+        assert mock_fetch.call_count == 3
+
+        for call_args in mock_fetch.call_args_list:
+            args, kwargs = call_args
+            assert "post-123" in str(args) or "post-123" in str(kwargs)
+            assert (
+                "token-1" in str(args)
+                or "token-1" in str(kwargs)
+                or "token-2" in str(args)
+                or "token-2" in str(kwargs)
+            )
+
+    @patch("scraping.main.fetch_post_stats")
+    @pytest.mark.asyncio
+    async def test_fetch_post_stats_limited_max_retries(self, mock_fetch, scraper):
+        """최대 재시도 횟수 초과 테스트"""
+        mock_fetch.return_value = None
+
+        result = await scraper.fetch_post_stats_limited(
+            "post-123", "token-1", "token-2"
+        )
+
+        assert result is None
+        assert mock_fetch.call_count >= 3
+
+    @patch("scraping.main.fetch_post_stats", new_callable=AsyncMock)
+    @pytest.mark.asyncio
+    async def test_fetch_post_stats_limited_failure(self, mock_fetch, scraper):
+        """fetch_post_stats 실패 테스트"""
+        mock_fetch.side_effect = [None, None, None]
+
+        result = await scraper.fetch_post_stats_limited(
+            "post-123", "token-1", "token-2"
+        )
+
+        assert result is None
+        assert mock_fetch.call_count == 3
+
+    @patch("scraping.main.fetch_velog_user_chk")
+    @patch("scraping.main.fetch_all_velog_posts")
+    @patch("scraping.main.AESEncryption")
+    @pytest.mark.asyncio
+    async def test_process_user_success(
+        self, mock_aes, mock_fetch_posts, mock_fetch_user_chk, scraper, user
+    ):
+        """유저 데이터 전체 처리 성공 테스트"""
+        mock_encryption = mock_aes.return_value
+        mock_encryption.decrypt.side_effect = lambda token: f"decrypted-{token}"
+        mock_encryption.encrypt.side_effect = lambda token: f"encrypted-{token}"
+
+        mock_fetch_user_chk.return_value = (
+            {"access_token": "new-token"},
+            {"data": {"currentUser": {"username": "testuser"}}},
+        )
+        mock_fetch_posts.return_value = []
+
+        with patch.object(
+            scraper, "update_old_tokens", new_callable=AsyncMock
+        ) as mock_update_tokens:
+            await scraper.process_user(user, MagicMock())
+
+        mock_update_tokens.assert_called_once()
+
+    @patch("scraping.main.transaction.atomic")
+    @pytest.mark.django_db(transaction=True)
+    async def test_process_user_failure_rollback(self, mock_atomic, scraper, user):
+        """유저 데이터 처리 실패 시 롤백 확인 테스트"""
+        mock_session = AsyncMock()
+        mock_atomic.side_effect = (
+            transaction.atomic
+        )  # 실제 트랜잭션을 패치한 형태로 유지
+
+        with patch(
+            "scraping.main.fetch_velog_user_chk",
+            side_effect=Exception("Failed to fetch user data"),
+        ):
+            try:
+                await scraper.process_user(user, mock_session)
+            except Exception:
+                pass
+
+        assert Post.objects.filter(user=user).count() == 0
+
+    @pytest.mark.django_db(transaction=True)
+    async def test_process_user_partial_failure_rollback(self, scraper, user):
+        """통계 업데이트 중 실패 시 롤백 확인 테스트"""
+        mock_session = AsyncMock()
+
+        with patch(
+            "scraping.main.fetch_post_stats_limited",
+            side_effect=Exception("Failed to fetch post stats limited"),
+        ):
+            try:
+                async with transaction.atomic():
+                    await scraper.process_user(user, mock_session)
+            except Exception:
+                pass
+
+        assert Post.objects.filter(user=user).exists()
+        assert not any(post.statistics for post in Post.objects.filter(user=user))
diff --git a/scraping/tests/test_sample.py b/scraping/tests/test_sample.py
deleted file mode 100644
index c6ae8a8..0000000
--- a/scraping/tests/test_sample.py
+++ /dev/null
@@ -1,6 +0,0 @@
-def add_nums(a: int, b: int) -> int:
-    return a + b
-
-
-def test_add_nums() -> None:
-    assert add_nums(1, 2) == 3