diff --git a/brainles_preprocessing/brain_extraction/brain_extractor.py b/brainles_preprocessing/brain_extraction/brain_extractor.py
index a7f86aa..de9cac5 100644
--- a/brainles_preprocessing/brain_extraction/brain_extractor.py
+++ b/brainles_preprocessing/brain_extraction/brain_extractor.py
@@ -1,16 +1,10 @@
 # TODO add typing and docs
 from abc import abstractmethod
-import os
-
-import nibabel as nib
-import numpy as np
-from brainles_hd_bet import run_hd_bet
+from shutil import copyfile
 
 from auxiliary.nifti.io import read_nifti, write_nifti
 from auxiliary.turbopath import name_extractor
-
-
-from shutil import copyfile
+from brainles_hd_bet import run_hd_bet
 
 
 class BrainExtractor:
@@ -68,6 +62,8 @@ def extract(
         log_file_path: str = None,
         # TODO convert mode to enum
         mode: str = "accurate",
+        device: int | str = 0,
+        do_tta: bool = True,
     ) -> None:
         # GPU + accurate + TTA
         """skullstrips images with HD-BET generates a skullstripped file and mask"""
@@ -78,9 +74,9 @@ def extract(
             # TODO consider postprocessing
             # postprocess=False,
             mode=mode,
-            device=0,
+            device=device,
             postprocess=False,
-            do_tta=True,
+            do_tta=do_tta,
             keep_mask=True,
             overwrite=True,
         )
@@ -89,7 +85,7 @@ def extract(
             masked_image_path.parent
             + "/"
             + name_extractor(masked_image_path)
-            + "_masked.nii.gz"
+            + "_mask.nii.gz"
         )
 
         copyfile(
diff --git a/pyproject.toml b/pyproject.toml
index 4c10ad0..4df8f63 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -55,7 +55,7 @@ BrainLes-HD-BET = ">=0.0.5"
 
 # utils
 tqdm = "^4.64.1"
-auxiliary = "^0.0.38"
+auxiliary = "^0.0.40"
 rich = "^13.6.0"
 
 [tool.poetry.dev-dependencies]
@@ -65,7 +65,7 @@ pytest = "^6.2"
 optional = true
 
 [tool.poetry.group.docs.dependencies]
-Sphinx  = ">=7.0.0"
+Sphinx = ">=7.0.0"
 sphinx-copybutton = ">=0.5.2"
 sphinx-rtd-theme = ">=1.3.0"
-myst-parser = ">=2.0.0"
\ No newline at end of file
+myst-parser = ">=2.0.0"
diff --git a/tests/test_brain_extractor.py b/tests/test_brain_extractor.py
new file mode 100644
index 0000000..54ca6d7
--- /dev/null
+++ b/tests/test_brain_extractor.py
@@ -0,0 +1,57 @@
+import os
+import shutil
+import unittest
+
+from auxiliary.turbopath import turbopath
+
+from brainles_preprocessing.brain_extraction import HDBetExtractor
+
+
+class TestHDBetExtractor(unittest.TestCase):
+    def setUp(self):
+        test_data_dir = turbopath(__file__).parent + "/test_data"
+        input_dir = test_data_dir + "/input"
+        self.output_dir = test_data_dir + "/temp_output"
+        os.makedirs(self.output_dir, exist_ok=True)
+
+        self.brain_extractor = HDBetExtractor()
+        self.input_image_path = input_dir + "/tcia_example_t1c.nii.gz"
+        self.masked_image_path = self.output_dir + "/bet_tcia_example_t1c.nii.gz"
+        self.brain_mask_path = self.output_dir + "/bet_tcia_example_t1c_masked.nii.gz"
+
+        print(self.input_image_path)
+        print(self.masked_image_path)
+
+    def tearDown(self):
+        # Clean up created files if they exist
+        shutil.rmtree(self.output_dir)
+
+    def test_extract_creates_output_files(self):
+        # we try to run the fastest possible skullstripping on GPU
+        self.brain_extractor.extract(
+            input_image_path=self.input_image_path,
+            masked_image_path=self.masked_image_path,
+            brain_mask_path=self.brain_mask_path,
+            mode="fast",
+            device="cpu",
+            do_tta=False,
+            # TODO generate and also test for presence of log file
+        )
+
+        self.assertTrue(
+            os.path.exists(self.masked_image_path), "Masked image file was not created."
+        )
+        self.assertTrue(
+            os.path.exists(self.brain_mask_path),
+            "Brain mask image file was not created.",
+        )
+
+    def test_apply_mask_creates_output_file(self):
+        # self.brain_extractor.apply_mask(
+        #     self.input_image, self.mask_image, self.output_image
+        # )
+        # self.assertTrue(
+        #     os.path.exists(self.output_image_path),
+        #     "Output image file was not created in apply_mask.",
+        # )
+        ...
diff --git a/tests/test_data/input/tcia_example_t1c.nii.gz b/tests/test_data/input/tcia_example_t1c.nii.gz
new file mode 100644
index 0000000..9979cb9
Binary files /dev/null and b/tests/test_data/input/tcia_example_t1c.nii.gz differ