Add tests for out of range negative index

Author: Dan-Flores

test/test_decoders.py

@@ -487,6 +487,9 @@ def test_get_frame_at_tuple_unpacking(self, device):
     def test_get_frame_at_fails(self, device, seek_mode):
         decoder = VideoDecoder(NASA_VIDEO.path, device=device, seek_mode=seek_mode)
 
+        with pytest.raises(IndexError, match="out of bounds"):
+            frame = decoder.get_frame_at(-10000)  # noqa
+
         with pytest.raises(IndexError, match="out of bounds"):
             frame = decoder.get_frame_at(10000)  # noqa
 
@@ -546,6 +549,12 @@ def test_get_frames_at(self, device, seek_mode):
     def test_get_frames_at_fails(self, device, seek_mode):
         decoder = VideoDecoder(NASA_VIDEO.path, device=device, seek_mode=seek_mode)
 
+        expected_converted_index = -10000 + len(decoder)
+        with pytest.raises(
+            RuntimeError, match=f"Invalid frame index={expected_converted_index}"
+        ):
+            decoder.get_frames_at([-10000])
+
         with pytest.raises(RuntimeError, match="Invalid frame index=390"):
             decoder.get_frames_at([390])