diff --git a/pyproject.toml b/pyproject.toml
index 6fcbd31..2f0c047 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -77,7 +77,7 @@ disallow_any_unimported = false
 [tool.ruff]
 fix = true
 line-length = 88
-include = ["mailchimp_api/**/*.py", "mailchimp_api/**/*.pyi", "pyproject.toml"]
+include = ["mailchimp_api/**/*.py", "mailchimp_api/**/*.pyi", "tests/**/*.py", "pyproject.toml"]
 exclude = []
 
 [tool.ruff.lint]
diff --git a/tests/test_mailchimp_openapi_spec.py b/tests/test_mailchimp_openapi_spec.py
index ade7074..6771c51 100644
--- a/tests/test_mailchimp_openapi_spec.py
+++ b/tests/test_mailchimp_openapi_spec.py
@@ -1,31 +1,38 @@
-from collections.abc import Iterator
+from unittest.mock import MagicMock, patch
 
+import pytest
 from autogen import UserProxyAgent
 from fastagency.api.openapi.client import OpenAPI
 
 from mailchimp_api.utils.create_api import create_api
 
-from unittest.mock import MagicMock, patch
-import pytest
+
+@pytest.fixture(scope="class")
+def setup_api() -> OpenAPI:
+    return create_api(mailchimp_api_key="test Key")  # pragma: allowlist secret
+
 
 class TestMailchimpOpenapiSpec:
     @pytest.fixture(autouse=True)
-    def setup(
+    def _setup(
         self,
-    ) -> Iterator[None]:
-        self.api = create_api(mailchimp_api_key="test Key")
-        yield
-
+    ) -> None:
+        self.headers = {
+            "Content-Type": "application/json",
+            "Authorization": "Basic YW55c3RyaW5nOnRlc3QgS2V5",
+        }
+        return
 
-    def test_create_api(self) -> None:
-        assert isinstance(self.api, OpenAPI)
-        url = self.api.servers[0]["url"]
+    def test_create_api(self, setup_api: OpenAPI) -> None:
+        assert isinstance(setup_api, OpenAPI)
+        url = setup_api.servers[0]["url"]
         assert url == "https://us14.api.mailchimp.com/3.0", url
 
-    @patch("fastagency.api.openapi.client.requests.get")
-    def test_mailchimp_api(
+    def _test_mailchimp_api(
         self,
         mock_post: MagicMock,
+        setup_api: OpenAPI,
+        function: str,
     ) -> None:
         mock_response = MagicMock()
         mock_response.status_code = 200
@@ -38,19 +45,45 @@ def test_mailchimp_api(
             code_execution_config=False,
         )
 
-        functions = ["get_ping"]
-        self.api._register_for_execution(user_proxy, functions=functions)
+        setup_api._register_for_execution(user_proxy, functions=[function])
+
+        assert tuple(user_proxy._function_map.keys()) == (function,)
 
-        assert tuple(user_proxy._function_map.keys()) == ("get_ping",)
+        func = user_proxy._function_map[function]
+        func(body={})
 
-        get_ping = user_proxy._function_map["get_ping"]
-        get_ping(body={})
+    @patch("fastagency.api.openapi.client.requests.get")
+    def test_mailchimp_api_ping(
+        self,
+        mock_post: MagicMock,
+        setup_api: OpenAPI,
+    ) -> None:
+        self._test_mailchimp_api(
+            mock_post=mock_post,
+            setup_api=setup_api,
+            function="get_ping",
+        )
+
+        mock_post.assert_called_once_with(
+            f"{setup_api.servers[0]['url']}/ping",
+            params={},
+            headers=self.headers,
+        )
+
+    @patch("fastagency.api.openapi.client.requests.get")
+    def test_mailchimp_api_get_lists(
+        self,
+        mock_post: MagicMock,
+        setup_api: OpenAPI,
+    ) -> None:
+        self._test_mailchimp_api(
+            mock_post=mock_post,
+            setup_api=setup_api,
+            function="get_lists",
+        )
 
         mock_post.assert_called_once_with(
-            f"{self.api.servers[0]['url']}/ping",
+            f"{setup_api.servers[0]['url']}/lists",
             params={},
-            headers={
-                'Content-Type': 'application/json',
-                'Authorization': 'Basic YW55c3RyaW5nOnRlc3QgS2V5',
-            },
+            headers=self.headers,
         )