Add specs for Rex::MIME::Encoding
Add specs for Rex::MIME::Header
Add specs for Rex::MIME::Part
Add first specs for Rex::MIME::Message
Add specs for add_part and add_part_attachment
Add specs for add_part_inline_attachment
Add some Message specs
Fix Rex::MIME::Header#parse
Fix Rex::MIME::Message#initialize boundaries parsing
Add @jlee-r7's feedback
Use a part subject to describe #add_part
Describe setters just expecting how assignement to properties should happen
Move let helpers to describe groups
Move once more let into describe
Land #3680, add specs for Rex::MIME