diff --git a/tests/conftest.py b/tests/conftest.py
index 2d88273..9a2df0f 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -68,11 +68,3 @@ def client():
 
     with TestClient(app) as c:
         yield c
-
-
-@pytest.fixture
-def mock_json_config_file(mocker: MockerFixture) -> typing.Callable[[str], None]:
-    def _inner(raw_json: str) -> None:
-        mocker.patch("edge_proxy.settings.Path.read_text", return_value=raw_json)
-
-    return _inner
diff --git a/tests/test_settings.py b/tests/test_settings.py
index 7b8c8d7..d649002 100644
--- a/tests/test_settings.py
+++ b/tests/test_settings.py
@@ -1,46 +1,42 @@
-import json
 import typing
 
 import pytest
+from pytest_mock import MockerFixture
 
-from src.edge_proxy.settings import AppConfig
+from edge_proxy.settings import get_settings
 
 
 @pytest.mark.parametrize(
-    "config_file_raw_json, settings_tests",
+    "config_file_json, expected_config",
     (
         (
-            json.dumps(
-                {
-                    "environment_key_pairs": [
-                        {"server_side_key": "abc123", "client_side_key": "ser.def456"}
-                    ],
-                    "api_poll_frequency": 10,
-                    "api_poll_timeout": 10,
-                    "api_url": "https://api.flagsmith.com/api/v1",
-                },
-            ),
+            {
+                "environment_key_pairs": [
+                    {"server_side_key": "abc123", "client_side_key": "ser.def456"}
+                ],
+                "api_poll_frequency": 10,
+                "api_poll_timeout": 10,
+                "api_url": "https://api.flagsmith.com/api/v1",
+            },
             {"api_poll_frequency_seconds": 10, "api_poll_timeout_seconds": 10},
         ),
         (
-            json.dumps(
-                {
-                    "environment_key_pairs": [
-                        {"server_side_key": "abc123", "client_side_key": "ser.def456"}
-                    ],
-                    "api_poll_frequency_seconds": 10,
-                    "api_poll_timeout_seconds": 10,
-                    "api_url": "https://api.flagsmith.com/api/v1",
-                }
-            ),
+            {
+                "environment_key_pairs": [
+                    {"server_side_key": "abc123", "client_side_key": "ser.def456"}
+                ],
+                "api_poll_frequency_seconds": 10,
+                "api_poll_timeout_seconds": 10,
+                "api_url": "https://api.flagsmith.com/api/v1",
+            },
             {"api_poll_frequency_seconds": 10, "api_poll_timeout_seconds": 10},
         ),
     ),
 )
 def test_settings_are_loaded_correctly(
-    mock_json_config_file: typing.Callable[[str], None],
-    config_file_raw_json: str,
-    settings_tests: dict[str, typing.Any],
+    mocker: MockerFixture,
+    config_file_json: dict[str, typing.Any],
+    expected_config: dict[str, typing.Any],
 ) -> None:
     """
     Parametrized test which accepts a raw json config file, and a dictionary representing the
@@ -48,11 +44,14 @@ def test_settings_are_loaded_correctly(
     """
 
     # Given
-    mock_json_config_file(config_file_raw_json)
+    mocker.patch(
+        "edge_proxy.settings.json_config_settings_source",
+        return_value=config_file_json,
+    )
 
     # When
-    config = AppConfig()
+    config = get_settings()
 
     # Then
-    for key, value in settings_tests.items():
+    for key, value in expected_config.items():
         assert getattr(config, key) == value