1 - create a repository on git
2 - create a branch named "a/b"
3 - create a Jenkinsfile into branch "a/b"
4 - create a multibrach pipeline project for this repository
5 - The name of brach is changed for URLEncode name "a%2Fb" in some places and "a%252Fb" in the URL.

example repository https://github.com/kuisathaverat/test.git