diff --git a/tests/app/test_dependencies.py b/tests/app/test_dependencies.py
index 67d3e05..9d1ce93 100644
--- a/tests/app/test_dependencies.py
+++ b/tests/app/test_dependencies.py
@@ -44,6 +44,7 @@
     LiteratureSearchTool,
     MorphologyFeatureTool,
 )
+from sqlalchemy import create_engine
 from sqlalchemy.exc import SQLAlchemyError
 from sqlalchemy.orm import Session
 
@@ -469,7 +470,8 @@ def test_get_engine_error(create_engine_mock, monkeypatch):
 
 @patch("sqlalchemy.orm.Session")
 def test_get_session_success(_):
-    engine = Mock()
+    database_url = "sqlite:///:memory:"
+    engine = create_engine(database_url)
     result = next(get_session(engine))
     assert isinstance(result, Session)
 
diff --git a/tests/tools/test_base_tool.py b/tests/tools/test_base_tool.py
index 1add1eb..fb9ab17 100644
--- a/tests/tools/test_base_tool.py
+++ b/tests/tools/test_base_tool.py
@@ -1,12 +1,10 @@
 from typing import Literal, Type
-from unittest.mock import Mock
 
-import pytest
 from langchain_core.language_models.fake_chat_models import FakeMessagesListChatModel
 from langchain_core.messages import AIMessage, HumanMessage
 from langchain_core.tools import ToolException
 from langgraph.prebuilt import create_react_agent
-from neuroagent.tools.base_tool import BasicTool, process_validation_error
+from neuroagent.tools.base_tool import BasicTool
 from pydantic import BaseModel
 
 
@@ -105,42 +103,3 @@ def bind_tools(self, functions: list):
         'unable to parse string as an integer"}]'
     )
     assert response["messages"][7].content == "fake answer"
-
-
-@pytest.mark.parametrize(
-    "title, errors, expected",
-    [
-        (
-            "ValidationError",
-            [{"type": "literal_error", "input": "distinct", "loc": ["led"]}],
-            '[{"Validation error": "Wrong value: provided distinct for input led. Try again and change this problematic input."}]',
-        ),
-        (
-            "ValidationError",
-            [{"type": "missing", "loc": ["led"]}],
-            '[{"Validation error": "Missing input : led. Try again and add this input."}]',
-        ),
-        (
-            "ValidationError",
-            [
-                {
-                    "type": "other_error",
-                    "loc": ["led"],
-                    "msg": "This is a test error message",
-                }
-            ],
-            '[{"Validation error": "led. This is a test error message"}]',
-        ),
-        (
-            "ValidationError",
-            [{}],
-            '[{"Validation error": "Error in ValidationError : \'type\'"}]',
-        ),
-    ],
-)
-def test_process_validation_error(title, errors, expected):
-    error = Mock()
-    error.title = title
-    error.errors.return_value = errors
-    result = process_validation_error(error)
-    assert result == expected