test-amend: match output using conditional test case name
D466 (
6cc8f848b4c3) allows output to be conditionally matched by test name.
This patch changes test-amend.t to use that feature, instead of duplicating
`hg amend` command or use `-q` to silence its output.
Differential Revision: https://phab.mercurial-scm.org/D601
{
"conduit_uri": "https://phab.mercurial-scm.org/api",
"repository.callsign": "HG",
"arc.land.onto.default": "@",
"base": "hg:.^"
}