Can post to jenkins modify the branch of the SCM?

[John Cary]

I would like developers to be able to fire off a test of
their branch of the project. So, e.g., I have a project,
myproj, and jenkins is ordinarily set up to run the builds
and test, e.g.,

myproj/branches/test

by executing a top-level test script, e.g., tst.sh.

Is there a way to remotely (through a post) tell jenkins
to switch to to a new branch, e.g.,

myproj/branches/joe-dev

before running the tests?

Thx....

[Michael Neale]

Looks like with parametrized build someone has done it: 

http://www.sourceprojects.org/jenkins-and-the-git-branch-selection

https://wiki.jenkins-ci.org/display/JENKINS/Git+Parameter+Plugin looks like a formalisation of this.