🐛 补充主题渲染时遗漏的转发推文中的图片 (#554)

tests/platforms/utils.py

@@ -14,3 +14,8 @@ def get_file(file_name: str):
     with open(path / file_name, encoding="utf8") as f:
         file_text = f.read()
         return file_text
+
+
+def get_bytes(file_name: str):
+    with open(path / file_name, "rb") as f:
+        return f.read()