How to use the aiosmtplib.email.extract_sender function in aiosmtplib

def test_extract_sender_valueerror_on_multiple_resent_message():
    message = EmailMessage()
    message["Resent-Date"] = "Mon, 20 Nov 2016 21:04:27 -0000"
    message["Resent-Date"] = "Mon, 20 Nov 2017 21:04:27 -0000"

    with pytest.raises(ValueError):
        extract_sender(message)

def test_extract_sender(mime_header, compat32_header, expected_sender):
    mime_message = EmailMessage()
    mime_message["From"] = mime_header

    mime_sender = extract_sender(mime_message)

    assert mime_sender == expected_sender

    compat32_message = Message()
    compat32_message["From"] = compat32_header

    compat32_sender = extract_sender(compat32_message)

    assert compat32_sender == expected_sender

def test_extract_sender(mime_header, compat32_header, expected_sender):
    mime_message = EmailMessage()
    mime_message["From"] = mime_header

    mime_sender = extract_sender(mime_message)

    assert mime_sender == expected_sender

    compat32_message = Message()
    compat32_message["From"] = compat32_header

    compat32_sender = extract_sender(compat32_message)

    assert compat32_sender == expected_sender

def test_extract_sender_resent_message():
    message = EmailMessage()
    message["From"] = "alice@example.com"

    message["Resent-Date"] = "Mon, 20 Nov 2017 21:04:27 -0000"
    message["Resent-From"] = "hubert@example.com"

    sender = extract_sender(message)

    assert sender == message["Resent-From"]
    assert sender != message["From"]

def test_extract_sender_prefers_sender_header():
    message = EmailMessage()
    message["From"] = "bob@example.com"
    message["Sender"] = "alice@example.com"

    sender = extract_sender(message)

    assert sender != message["From"]
    assert sender == message["Sender"]

so rather than guess we raise a ``ValueError`` in that case.

        :raises ValueError:
            on more than one Resent header block
            on no sender kwarg or From header in message
            on no recipients kwarg or To, Cc or Bcc header in message
        :raises SMTPRecipientsRefused: delivery to all recipients failed
        :raises SMTPResponseException: on invalid response
        """
        if mail_options is None:
            mail_options = []
        else:
            mail_options = list(mail_options)

        if sender is None:
            sender = extract_sender(message)
        if not sender:
            raise ValueError("No From header provided in message")

        if isinstance(recipients, str):
            recipients = [recipients]
        elif recipients is None:
            recipients = extract_recipients(message)
        if not recipients:
            raise ValueError("No recipient headers provided in message")

        # Make sure we've done an EHLO for extension checks
        await self._ehlo_or_helo_if_needed()

        try:
            sender.encode("ascii")
            "".join(recipients).encode("ascii")