case: alpha\t\n\nbeta
node: [Text(alpha), ParagraphBreak, Text(beta)]
warn: []

case: alpha\n\t\nbeta
node: [Text(alpha), ParagraphBreak, Text(beta)]
warn: []

case: alpha\n\n\t beta
node: [Text(alpha), ParagraphBreak, Text(beta)]
warn: []

case: alpha\n\n\tbeta
node: [Text(alpha), ParagraphBreak, Text(beta)]
warn: []

case: alpha\n\n\n\nbeta
node: [Text(alpha), ParagraphBreak, Text(beta)]
warn: [Warning(RepeatedEmptyLine), Warning(RepeatedEmptyLine)]

case: alpha\n\n\nbeta
node: [Text(alpha), ParagraphBreak, Text(beta)]
warn: [Warning(RepeatedEmptyLine)]

case: alpha\n\nbeta
node: [Text(alpha), ParagraphBreak, Text(beta)]
warn: []

case: alpha\n \nbeta
node: [Text(alpha), ParagraphBreak, Text(beta)]
warn: []

case: alpha \n\nbeta
node: [Text(alpha), ParagraphBreak, Text(beta)]
warn: []