diff --git a/src/aki_prj23_transparenzregister/utils/news_mongo_service.py b/src/aki_prj23_transparenzregister/utils/news_mongo_service.py
index 1bc6239..a2ea4ec 100644
--- a/src/aki_prj23_transparenzregister/utils/news_mongo_service.py
+++ b/src/aki_prj23_transparenzregister/utils/news_mongo_service.py
@@ -38,7 +38,7 @@ class MongoNewsService:
         """
         result = list(self.collection.find({"_id": id}))
         if len(result) == 1:
-            return MongoEntryTransformer.transform_outgoing(list(result)[0])
+            return MongoEntryTransformer.transform_outgoing(result[0])
         return None
 
     def insert(self, news: News):
diff --git a/tests/utils/news_mongo_service_test.py b/tests/utils/news_mongo_service_test.py
index 4fb5d08..0d337d6 100644
--- a/tests/utils/news_mongo_service_test.py
+++ b/tests/utils/news_mongo_service_test.py
@@ -1,8 +1,12 @@
-from unittest.mock import Mock
+from unittest.mock import Mock, patch
 
 import pytest
 
-from aki_prj23_transparenzregister.utils.news_mongo_service import MongoNewsService
+from aki_prj23_transparenzregister.models.news import News
+from aki_prj23_transparenzregister.utils.news_mongo_service import (
+    MongoEntryTransformer,
+    MongoNewsService,
+)
 
 
 @pytest.fixture()
@@ -42,3 +46,70 @@ def test_init(mock_mongo_connector, mock_collection):
     mock_mongo_connector.database = {"news": mock_collection}
     service = MongoNewsService(mock_mongo_connector)
     assert service.collection == mock_collection
+
+
+def test_get_all(mock_mongo_connector, mock_collection):
+    mock_mongo_connector.database = {"news": mock_collection}
+    service = MongoNewsService(mock_mongo_connector)
+
+    mock_collection.find.return_value = []
+    assert service.get_all() == []
+
+
+def test_get_by_id_with_result(mock_mongo_connector, mock_collection):
+    mock_mongo_connector.database = {"news": mock_collection}
+    service = MongoNewsService(mock_mongo_connector)
+
+    with patch(
+        "aki_prj23_transparenzregister.utils.news_mongo_service.MongoEntryTransformer.transform_outgoing"
+    ) as mock_out:
+        mock_collection.find.return_value = [{}]
+        mock_out.return_value = {}
+        assert service.get_by_id("foadh") == {}
+
+
+def test_get_by_id_no_result(mock_mongo_connector, mock_collection):
+    mock_mongo_connector.database = {"news": mock_collection}
+    service = MongoNewsService(mock_mongo_connector)
+
+    mock_collection.find.return_value = []
+    assert service.get_by_id("foadh") is None
+
+
+def test_insert(mock_mongo_connector, mock_collection):
+    mock_mongo_connector.database = {"news": mock_collection}
+    service = MongoNewsService(mock_mongo_connector)
+
+    with patch(
+        "aki_prj23_transparenzregister.utils.news_mongo_service.MongoEntryTransformer.transform_ingoing"
+    ) as mock_in:
+        mock_collection.insert_one.return_value = {}
+        mock_in.return_value = {}
+        assert service.insert({}) == {}
+
+
+def test_transform_ingoing():
+    news = News("42", None, None, None, None)
+    result = MongoEntryTransformer.transform_ingoing(news)
+    assert result["_id"] == "42"
+    assert "id" not in result
+
+
+def test_transform_outgoing():
+    data = {
+        "_id": "4711",
+        "title": "Hello",
+        "date": "Today",
+        "text": "World",
+        "source_url": "chat.openai.com",
+    }
+    expected_result = News(
+        **{
+            "id": "4711",
+            "title": "Hello",
+            "date": "Today",
+            "text": "World",
+            "source_url": "chat.openai.com",
+        }
+    )
+    assert MongoEntryTransformer.transform_outgoing(data) == expected_result