# Add a code block here, if required

# test_subject_encoding.py
from email.message import EmailMessage
from email.policy import SMTPUTF8
import sys

# Use one of the subject strings that caused issues
# Make sure this is the exact string causing Mojibake
subject = 'Vectorsentinel与Drone Volt合作共赢，探索无人机安防新机遇'

print(f"Python Version: {sys.version}")
print(f"Testing subject: {repr(subject)}")

msg = EmailMessage(policy=SMTPUTF8)
msg['From'] = 'sender@example.com'
msg['To'] = 'recipient@example.com'
# Use standard assignment
msg['Subject'] = subject
msg.set_content('Test body content.')

print("\n--- Message As String ---")
try:
    # Use as_string() which should also trigger encoding
    print(msg.as_string())
except Exception as e:
    print(f"Error during as_string(): {e}\n")

print("\n--- Message As Bytes (Decoded) ---")
try:
    # Use as_bytes() and decode for printing
    # We are primarily interested in the Subject: line format
    message_bytes = msg.as_bytes()
    print(message_bytes.decode('utf-8', 'replace')) # Use utf-8 decode
except Exception as e:
    print(f"Error during as_bytes(): {e}\n")