diff --git a/tests/test_mask.py b/tests/test_mask.py
index e5ae03e..19698d5 100644
--- a/tests/test_mask.py
+++ b/tests/test_mask.py
@@ -1,4 +1,6 @@
+import cv2
 import numpy as np
+import pytest
 from PIL import Image, ImageDraw
 
 from adetailer.mask import dilate_erode, has_intersection, is_all_black, offset
@@ -78,6 +80,24 @@ def test_is_all_black_2():
     assert not is_all_black(img)
 
 
+def test_is_all_black_rgb_image_pil():
+    img = Image.new("RGB", (10, 10), color="red")
+    assert not is_all_black(img)
+
+    img = Image.new("RGBA", (10, 10), color="red")
+    assert not is_all_black(img)
+
+
+def test_is_all_black_rgb_image_numpy():
+    img = np.full((10, 10, 4), 127, dtype=np.uint8)
+    with pytest.raises(cv2.error):
+        is_all_black(img)
+
+    img = np.full((4, 10, 10), 0.5, dtype=np.float32)
+    with pytest.raises(cv2.error):
+        is_all_black(img)
+
+
 def test_has_intersection_1():
     arr1 = np.array(
         [
diff --git a/tests/test_ultralytics.py b/tests/test_ultralytics.py
index 1a75d7a..c772607 100644
--- a/tests/test_ultralytics.py
+++ b/tests/test_ultralytics.py
@@ -11,8 +11,10 @@ from adetailer.ultralytics import ultralytics_predict
         "face_yolov8n.pt",
         "face_yolov8n_v2.pt",
         "face_yolov8s.pt",
+        "face_yolov9c.pt",
         "hand_yolov8n.pt",
         "hand_yolov8s.pt",
+        "hand_yolov9c.pt",
         "person_yolov8n-seg.pt",
         "person_yolov8s-seg.pt",
         "person_yolov8m-seg.pt",