epublib 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
getSpine()	pass
setSpine()	pass
getMetadata()	pass
setMetadata()	pass
addResource()	pass
createResource()	pass
createStrResource()	pass
decode()	pass
readEpubLazy()	pass
readEpubFile()	pass
readEpubToBook()	pass
isEmpty()	pass
getHref()	pass
loadResources()	pass
loadResourcesZip()	pass
outFile()	pass
addAuthor()	pass
addTitle()	pass
getAuthors()	pass
setLanguage()	pass
write()	pass