test_volume_utils: avoid rescaling data for test

tomoscan/test/test_volume_utils.py

@@ -101,6 +101,8 @@ def test_concatenate_volume(tmp_path, volume_class, axis):
         else:
             vol_params.update({"folder": os.path.join(raw_data_dir, f"volume_{i_vol}")})
         volume = volume_class(**vol_params)
+        if isinstance(volume, JP2KVolume):
+            volume.rescale_data = False  # simplify test
         volume.save()
         volumes.append(volume)
         volume.data = None
@@ -117,6 +119,8 @@ def test_concatenate_volume(tmp_path, volume_class, axis):
         final_volume = volume_class(
             folder=os.path.join(output_dir, "final_vol"),
         )
+        if isinstance(final_volume, JP2KVolume):
+            final_volume.rescale_data = False
 
     concatenate(output_volume=final_volume, volumes=volumes, axis=axis)
     if axis == 0: