如何使用Robot Framework获取电子邮件？

Question

我尝试使用robotframework-imaplibrary中的示例：

Open Mailbox    host=imap.domain.com    user=${mail}    password=${PW}
${LATEST} =    Wait For Email    sender=${sender}    timeout=300
${parts} =    Walk Multipart Email    ${LATEST}
:FOR    ${i}    IN RANGE    ${parts}
\\    Walk Multipart Email    ${LATEST}
\\    ${content-type} =    Get Multipart Content Type
\\    Continue For Loop If    '${content-type}' != 'text/html'
\\    ${payload} =    Get Multipart Payload    decode=True
\\    Should Contain    ${payload}    your email
\\    ${HTML} =    Open Link From Email    ${LATEST}
\\    Should Contain    ${HTML}    Your email
Close Mailbox

在测试运行后，我收到第三行的错误（$ {parts} =遍历多部电子邮件$ {LATEST}）：

  

TypeError：initial_value必须为str或None，而不是字节

有人知道电子邮件检查的有效示例吗？