diff --git a/tests/unit_tests/test_base_camera.py b/tests/unit_tests/test_base_camera.py
index aba5b4ea..c8b64274 100644
--- a/tests/unit_tests/test_base_camera.py
+++ b/tests/unit_tests/test_base_camera.py
@@ -5,6 +5,8 @@ test_simulated_camera.py and for testing the consistency of camera APIs see
 test_cameras.py.
 """
 
+import tempfile
+
 import numpy as np
 import pytest
 from PIL import Image
@@ -19,7 +21,8 @@ from ..shared_utils.lt_test_utils import LabThingsTestEnv
 def test_env() -> LabThingsTestEnv:
     """Yield a test environment with the Simulated Camera and Dummy Stage."""
     thing_conf = {"camera": SimulatedCamera, "stage": DummyStage}
-    with LabThingsTestEnv(things=thing_conf) as env:
+    app_config = {"data_folder": tempfile.gettempdir()}
+    with LabThingsTestEnv(things=thing_conf, application_config=app_config) as env:
         yield env
 
 
diff --git a/tests/unit_tests/test_metadata.py b/tests/unit_tests/test_metadata.py
index 7c5f87b6..4b158e5a 100644
--- a/tests/unit_tests/test_metadata.py
+++ b/tests/unit_tests/test_metadata.py
@@ -1,6 +1,7 @@
 """Tests that captures have the expected metadata."""
 
 import json
+import tempfile
 from datetime import datetime
 from pathlib import Path
 
@@ -99,7 +100,8 @@ def test_env() -> LabThingsTestEnv:
         "stage": DummyStage,
         "bg_channel_deviations_luv": ChannelDeviationLUV,
     }
-    with LabThingsTestEnv(things=thing_conf) as env:
+    app_config = {"data_folder": tempfile.gettempdir()}
+    with LabThingsTestEnv(things=thing_conf, application_config=app_config) as env:
         yield env
 
 
diff --git a/tests/unit_tests/test_simulated_camera.py b/tests/unit_tests/test_simulated_camera.py
index dd499fc9..8b76106c 100644
--- a/tests/unit_tests/test_simulated_camera.py
+++ b/tests/unit_tests/test_simulated_camera.py
@@ -1,6 +1,7 @@
 """Test the functionality specific to the simulated camera."""
 
 import logging
+import tempfile
 import time
 
 import numpy as np
@@ -27,7 +28,10 @@ def test_env() -> LabThingsTestEnv:
         "stage": DummyStage,
         "bg_channel_deviations_luv": ChannelDeviationLUV,
     }
-    with LabThingsTestEnv(things=thing_conf) as env:
+
+    app_config = {"data_folder": tempfile.gettempdir()}
+
+    with LabThingsTestEnv(things=thing_conf, application_config=app_config) as env:
         yield env
 
 
diff --git a/tests/unit_tests/test_stage.py b/tests/unit_tests/test_stage.py
index f922ef65..a699b65f 100644
--- a/tests/unit_tests/test_stage.py
+++ b/tests/unit_tests/test_stage.py
@@ -2,6 +2,7 @@
 
 import itertools
 import logging
+import tempfile
 import threading
 import time
 from dataclasses import dataclass
@@ -176,7 +177,8 @@ def test_direction_inversion(dummy_stage):
 def test_direction_errors_local_and_http():
     """Check for expected errors both locally and over http."""
     thing_conf = {"camera": SimulatedCamera, "stage": DummyStage}
-    with LabThingsTestEnv(things=thing_conf) as test_env:
+    app_config = {"data_folder": tempfile.gettempdir()}
+    with LabThingsTestEnv(things=thing_conf, application_config=app_config) as test_env:
         dummy_stage = test_env.get_thing_by_type(DummyStage)
         stage_client = test_env.get_thing_client("stage")