Use monkeypatch for environment variable test

Author: beemeeupnow

alchemy_sdk_py/evm_node.py

@@ -2,7 +2,7 @@
 import requests
 from dotenv import load_dotenv
 from typing import List, Optional, Union
-from utils import HexIntStringNumber
+from .utils import HexIntStringNumber
 from .errors import NO_API_KEY_ERROR
 from .networks import Network
 

tests/integration/test_alchemy_setup.py

@@ -1,6 +1,7 @@
-from alchemy_sdk_py import Alchemy
 import os
 import pytest
+from alchemy_sdk_py import Alchemy
+from _pytest.monkeypatch import MonkeyPatch
 
 
 def test_initialize_empty_network(dummy_api_key, mock_env_missing):
@@ -38,10 +39,8 @@ def test_api_key_property(dummy_api_key):
     assert alchemy.key == dummy_api_key
 
 
-def test_key_with_environment_variable():
+def test_key_with_environment_variable(monkeypatch: MonkeyPatch):
     test_key = "test_key"
-    original_value = os.environ["ALCHEMY_API_KEY"]
-    os.environ["ALCHEMY_API_KEY"] = test_key
+    monkeypatch.setenv("ALCHEMY_API_KEY", test_key)
     alchemy = Alchemy()
     assert alchemy.key == test_key
-    os.environ["ALCHEMY_API_KEY"] = original_value