fix：表情包识别失败问题

pytests/image_sys_test/test_image_data_model.py

@@ -0,0 +1,74 @@
+from pathlib import Path
+from types import SimpleNamespace
+
+import io
+
+from PIL import Image as PILImage
+import pytest
+
+from src.common.data_models.image_data_model import MaiEmoji, MaiImage
+
+
+def _build_test_image_bytes(image_format: str) -> bytes:
+    image = PILImage.new("RGB", (8, 8), color="white")
+    buffer = io.BytesIO()
+    image.save(buffer, format=image_format)
+    return buffer.getvalue()
+
+
+@pytest.mark.asyncio
+async def test_calculate_hash_format_updates_runtime_path_metadata(tmp_path: Path) -> None:
+    image_bytes = _build_test_image_bytes("JPEG")
+    tmp_file_path = tmp_path / "emoji.tmp"
+    tmp_file_path.write_bytes(image_bytes)
+
+    emoji = MaiEmoji(full_path=tmp_file_path, image_bytes=image_bytes)
+
+    assert await emoji.calculate_hash_format() is True
+    assert emoji.image_format == "jpeg"
+    assert emoji.full_path.suffix == ".jpeg"
+    assert emoji.file_name == emoji.full_path.name
+    assert emoji.dir_path == tmp_path.resolve()
+
+
+@pytest.mark.parametrize(
+    ("model_cls", "extra_fields"),
+    [
+        (
+            MaiEmoji,
+            {
+                "description": "",
+                "last_used_time": None,
+                "query_count": 0,
+                "register_time": None,
+            },
+        ),
+        (
+            MaiImage,
+            {
+                "description": "",
+                "vlm_processed": False,
+            },
+        ),
+    ],
+)
+def test_from_db_instance_restores_image_format_from_path(
+    tmp_path: Path,
+    model_cls: type[MaiEmoji] | type[MaiImage],
+    extra_fields: dict[str, object],
+) -> None:
+    image_path = tmp_path / "cached.png"
+    image_path.write_bytes(_build_test_image_bytes("PNG"))
+
+    record = SimpleNamespace(
+        no_file_flag=False,
+        image_hash="hash",
+        full_path=str(image_path),
+        **extra_fields,
+    )
+
+    image = model_cls.from_db_instance(record)
+
+    assert image.full_path == image_path.resolve()
+    assert image.file_name == image_path.name
+    assert image.image_format == "png"