diff --git a/src/depiction/misc/integration_test_utils.py b/src/depiction/misc/integration_test_utils.py
index 5b7e2eb..14fbd52 100644
--- a/src/depiction/misc/integration_test_utils.py
+++ b/src/depiction/misc/integration_test_utils.py
@@ -1,4 +1,3 @@
-import warnings
 from typing import Optional
 
 from numpy.typing import ArrayLike
@@ -20,12 +19,3 @@ def populate_test_file(
         with ImzmlWriteFile(path, imzml_mode).writer() as writer:
             for mz_arr, int_arr, coordinates in zip(mz_arr_list, int_arr_list, coordinates_list):
                 writer.add_spectrum(mz_arr, int_arr, coordinates)
-
-    @staticmethod
-    def treat_warnings_as_error(test_case) -> None:
-        """To be called from setUp."""
-        # TODO reuse or refactor (and move out of integration_test_utils and rather a more general test_utils?)
-        warnings_ctx = warnings.catch_warnings()
-        warnings_ctx.__enter__()
-        warnings.simplefilter("error")
-        test_case.addCleanup(warnings_ctx.__exit__, None, None, None)
diff --git a/tests/unit/image/test_spatial_smoothing_sparse_aware.py b/tests/unit/image/test_spatial_smoothing_sparse_aware.py
index 0bb5f0d..22aba68 100644
--- a/tests/unit/image/test_spatial_smoothing_sparse_aware.py
+++ b/tests/unit/image/test_spatial_smoothing_sparse_aware.py
@@ -1,4 +1,5 @@
 import unittest
+import warnings
 from datetime import timedelta
 from functools import cached_property
 
@@ -8,7 +9,15 @@
 from xarray import DataArray
 
 from depiction.image.spatial_smoothing_sparse_aware import SpatialSmoothingSparseAware
-from depiction.misc.integration_test_utils import IntegrationTestUtils
+
+
+def _treat_warnings_as_error(test_case) -> None:
+    """To be called from setUp."""
+    # TODO reuse or refactor (and move out of integration_test_utils and rather a more general test_utils?)
+    warnings_ctx = warnings.catch_warnings()
+    warnings_ctx.__enter__()
+    warnings.simplefilter("error")
+    test_case.addCleanup(warnings_ctx.__exit__, None, None, None)
 
 
 class TestSpatialSmoothingSparseAware(unittest.TestCase):
@@ -16,7 +25,7 @@ def setUp(self) -> None:
         self.mock_kernel_size = 5
         self.mock_kernel_std = 1.0
         self.mock_use_interpolation = False
-        IntegrationTestUtils.treat_warnings_as_error(self)
+        _treat_warnings_as_error(self)
 
     @cached_property
     def mock_smooth(self) -> SpatialSmoothingSparseAware: