IMAP单元测试用例

该测试用例基于OpenHarmony系统下，进行单元测试

单元测试用例覆盖情况

接口名	是否通过	备注
serverSupports	pass
getBoxes	pass
addBox	pass
dexBox	pass
renameBox	pass
subscribeBox	pass
unsubscribeBox	pass
getSubscribeBox	pass
status	pass
openBox_closeBox	pass
fetch_closeBox	pass
addFlags_closeBox	pass
setFlags_closeBox	pass
delFlags_closeBox	pass
addKeywords_closeBox	pass
setKeywords_closeBox	pass
delKeywords_closeBox	pass
expunge_closeBox	pass
search_closeBox	pass
sort_closeBox	pass
copy_closeBox	pass
move_closeBox	pass
append_closeBox	pass
end	pass