Example of a working Vagrantfile running MacOSX on MacOS, Windows & Linux hosts
Just run a vagrant up and you should be able to see something like:
There are no official boxes, but some home brewn ones - like: https://app.vagrantup.com/yzgyyang/boxes/macOS-10.14
Running MacOS in VirtualBox: https://techsviewer.com/install-macos-10-14-mojave-virtualbox-windows/
https://wiki.archlinux.org/index.php/VirtualBox/Tips_and_tricks#Install_MacOS_guest