diff --git a/fpdf/image_parsing.py b/fpdf/image_parsing.py
index 031dc1efb..6fec6d187 100644
--- a/fpdf/image_parsing.py
+++ b/fpdf/image_parsing.py
@@ -269,8 +269,10 @@ def get_img_info(filename, img=None, image_filter="AUTO", dims=None):
             elif img.mode == "CMYK":
                 dpn, bpc, colspace = 4, 8, "DeviceCMYK"
                 jpeg_inverted = True
-            if img.mode == "L":
+            elif img.mode == "L":
                 dpn, bpc, colspace = 1, 8, "DeviceGray"
+            else:
+                raise ValueError(f"Unsupported image mode: {img.mode}")
             img_raw_data.seek(0)
             info.update(
                 {
diff --git a/fpdf/text_region.py b/fpdf/text_region.py
index 5c3e24b1b..90a1ccea3 100644
--- a/fpdf/text_region.py
+++ b/fpdf/text_region.py
@@ -194,6 +194,8 @@ def render(self, col_left, col_width, max_height):
                 "ImageParagraph.build_line() must be called before render()."
             )
         is_svg = isinstance(self.info, VectorImageInfo)
+
+        # pylint: disable=possibly-used-before-assignment
         if self.height:
             h = self.height
         else:
diff --git a/test/text_shaping/test_bidirectional.py b/test/text_shaping/test_bidirectional.py
index 5a25953ef..3ee8f14a8 100644
--- a/test/text_shaping/test_bidirectional.py
+++ b/test/text_shaping/test_bidirectional.py
@@ -127,13 +127,14 @@ def test_bidi_character():
         string = ""
         for char in test_data[0].split(" "):
             string += chr(int(char, 16))
-        assert test_data[1] in ("0", "1", "2")
         if test_data[1] == "0":
             base_direction = TextDirection.LTR
         elif test_data[1] == "1":
             base_direction = TextDirection.RTL
         elif test_data[1] == "2":
             base_direction = None  # auto
+        else:
+            raise ValueError(f"Invalid base direction {test_data[1]}")
 
         if not base_direction:
             # test the auto detect direction algorithm