You can now push to your own mozharness repository (even a specific branch) and have it be tested on Try.
Few weeks ago we developed mozharness pinning (aka mozharness.json) and recently we have enabled it for Try. Read the blog post to learn how to make use of it.

NOTE: This currently only works for desktop, mobile and b2g test jobs. More to come.
NOTE: We only support named branches, tags or specific revisions. Do not use bookmarks as it doesn't work.

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This work by Zambrano Gasparnian, Armen is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported License.

http://feedproxy.google.com/~r/armenzg_mozilla/~3/_B3LTVbxLj0/test-mozharness-changes-on-try.html