diff --git a/tests/conftest.py b/tests/conftest.py
index f4464de..622117c 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -1,23 +1,20 @@
 import logging
 import os
-from typing import List
+from copy import deepcopy
+from pathlib import Path
+from typing import Any, Dict, List
 
 import pytest  # type: ignore
 from _pytest.monkeypatch import MonkeyPatch  # type: ignore
 from fastapi.testclient import TestClient
-from pytest_mock import mocker  # type: ignore
+from pytest_mock import MockerFixture
 
-# from inboard.app.base.main import App as base_app
+from inboard import gunicorn_conf as gunicorn_conf_module
+from inboard import logging_conf as logging_conf_module
 from inboard.app.fastapibase.main import app as fastapi_app
 from inboard.app.starlettebase.main import app as starlette_app
 
 
-@pytest.fixture
-def clients() -> List[TestClient]:
-    """Instantiate test client classes."""
-    return [TestClient(fastapi_app), TestClient(starlette_app)]
-
-
 @pytest.fixture
 def basic_auth(
     monkeypatch: MonkeyPatch,
@@ -33,12 +30,42 @@ def basic_auth(
 
 
 @pytest.fixture
-def mock_logger(mocker: mocker) -> logging.Logger:
+def clients() -> List[TestClient]:
+    """Instantiate test client classes."""
+    return [TestClient(fastapi_app), TestClient(starlette_app)]
+
+
+@pytest.fixture
+def gunicorn_conf_path(mocker: MockerFixture, monkeypatch: MonkeyPatch) -> Path:
+    """Set path to default Gunicorn configuration file."""
+    path = Path(gunicorn_conf_module.__file__)
+    monkeypatch.setenv("GUNICORN_CONF", str(path))
+    assert os.getenv("GUNICORN_CONF") == str(path)
+    return path
+
+
+@pytest.fixture
+def logging_conf_dict() -> Dict[str, Any]:
+    """Load logging configuration dictionary from logging configuration module."""
+    return deepcopy(logging_conf_module.LOGGING_CONFIG)
+
+
+@pytest.fixture
+def logging_conf_path(mocker: MockerFixture, monkeypatch: MonkeyPatch) -> Path:
+    """Set path to default logging configuration file."""
+    path = Path(logging_conf_module.__file__)
+    monkeypatch.setenv("LOGGING_CONF", str(path))
+    assert os.getenv("LOGGING_CONF") == str(path)
+    return path
+
+
+@pytest.fixture
+def mock_logger(mocker: MockerFixture) -> logging.Logger:
     """Mock the logger with pytest-mock and a pytest fixture.
     - https://github.com/pytest-dev/pytest-mock
     - https://docs.pytest.org/en/latest/fixture.html
     """
-    logger = logging.getLogger("pytest")
+    logger = logging.getLogger()
     mocker.patch.object(logger, "debug")
     mocker.patch.object(logger, "error")
     mocker.patch.object(logger, "info")
diff --git a/tests/test_start.py b/tests/test_start.py
new file mode 100644
index 0000000..f2325df
--- /dev/null
+++ b/tests/test_start.py
@@ -0,0 +1,21 @@
+from pathlib import Path
+
+from inboard import start
+
+
+class TestConfPaths:
+    """Test paths to configuration files.
+    ---
+    """
+
+    def test_set_default_conf_path_gunicorn(self, gunicorn_conf_path: Path) -> None:
+        """Test default Gunicorn configuration file path (different without Docker)."""
+        assert "inboard/gunicorn_conf.py" in str(gunicorn_conf_path)
+        assert "logging" not in str(gunicorn_conf_path)
+        assert start.set_conf_path("gunicorn") == gunicorn_conf_path
+
+    def test_set_default_conf_path_logging(self, logging_conf_path: Path) -> None:
+        """Test default logging configuration file path (different without Docker)."""
+        assert "inboard/logging_conf.py" in str(logging_conf_path)
+        assert "gunicorn" not in str(logging_conf_path)
+        assert start.set_conf_path("logging") == logging_conf_path