Add test

tests/conftest.py

@@ -46,3 +46,11 @@ 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

tests/test_settings.py

@@ -0,0 +1,58 @@
+import json
+import typing
+
+import pytest
+
+from src.edge_proxy.settings import AppConfig
+
+
+@pytest.mark.parametrize(
+    "config_file_raw_json, settings_tests",
+    (
+        (
+            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",
+                },
+            ),
+            {"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",
+                }
+            ),
+            {"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],
+) -> None:
+    """
+    Parametrized test which accepts a raw json config file, and a dictionary representing the
+    specific tests that are required against the resulting config.
+    """
+
+    # Given
+    mock_json_config_file(config_file_raw_json)
+
+    # When
+    config = AppConfig()
+
+    # Then
+    for key, value in settings_tests.items():
+        assert getattr(config, key) == value