From 75cb1c1b87ae4be028f3e15141c14c28dd0d04a0 Mon Sep 17 00:00:00 2001
From: Andrew Murray <radarhere@users.noreply.github.com>
Date: Sat, 21 Sep 2024 16:02:23 +1000
Subject: [PATCH] Test unsupported image mode

---
 Tests/test_file_webp.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Tests/test_file_webp.py b/Tests/test_file_webp.py
index e7c887279..79f6bb4e0 100644
--- a/Tests/test_file_webp.py
+++ b/Tests/test_file_webp.py
@@ -127,6 +127,11 @@ class TestFileWebp:
             reloaded.seek(1)
             assert_image_similar(im2, reloaded, 1)
 
+    def test_unsupported_image_mode(self) -> None:
+        im = Image.new("1", (1, 1))
+        with pytest.raises(ValueError):
+            _webp.WebPEncode(im.getim(), False, 0, 0, "", 4, 0, b"", "")
+
     def test_icc_profile(self, tmp_path: Path) -> None:
         self._roundtrip(tmp_path, self.rgb_mode, 12.5, {"icc_profile": None})
         self._roundtrip(