Revert branch or merge revert from trunk?

Is there a commonly accepted practice on how to propaga开发者_如何学运维te a revert from trunk to test/stage and production branches?

My scenario should be quite common:

• rev 1 start test branch
• rev 2 start prod branch
• rev 3 commit change to trunk
• rev 4 merge trunk to test
• rev 5 revert trunk to rev 1

Would I now

a) merge trunk to test

or

b) revert test to rev 1

?

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I don't know about "commonly accepted", but since it doesn't matter, for simplicity, I personally would want my test branch rev to be no further from the main rev than necessary, so I would merge trunk to test.