peppelinux
commented
2 years ago https://www.aleksey.com/xmlsec/download.html
anyway it's present in the setup section of the readme, here https://github.com/italia/spid-sp-test#setup
not at last, you can use spid-sp-test attaching a bash in a running spid-saml-cehck docker container
you can also update it using pip install --upgrade spid-sp-test
any contribution to improve readme will be appreciated and merged! :) thank you @MdreW
xmlsec1 is required for all certificate tests. the xmlsec1 is available in all major linux dist but is not available in Windows, Macos and some minimal linux dist.