$ . $TESTDIR/wireprotohelpers.sh

  $ hg init server

  $ enablehttpv2 server

  $ cd server

  $ hg debugdrawdag << EOF

  > C D

  > |/

  > B

  > |

  > A

  > EOF

  $ hg up B

  2 files updated, 0 files merged, 0 files removed, 0 files unresolved

  $ hg branch branch1

  marked working directory as branch branch1

  (branches are permanent and global, did you want a bookmark?)

  $ echo b1 > foo

  $ hg -q commit -A -m 'branch 1'

  $ hg up B

  0 files updated, 0 files merged, 1 files removed, 0 files unresolved

  $ hg branch branch2

  marked working directory as branch branch2

  $ echo b2 > foo

  $ hg -q commit -A -m 'branch 2'

  $ hg log -T '{rev}:{node} {branch} {desc}\n'

  5:224161c7589aa48fa83a48feff5e95b56ae327fc branch2 branch 2

  4:b5faacdfd2633768cb3152336cc0953381266688 branch1 branch 1

  3:be0ef73c17ade3fc89dc41701eb9fc3a91b58282 default D

  2:26805aba1e600a82e93661149f2313866a221a7b default C

  1:112478962961147124edd43549aedd1a335e44bf default B

  0:426bada5c67598ca65036d57d9e4b64b0c1ce7a0 default A

  $ hg serve -p $HGPORT -d --pid-file hg.pid -E error.log

  $ cat hg.pid > $DAEMON_PIDS

No arguments returns something reasonable

  $ sendhttpv2peer << EOF

  > command branchmap

  > EOF

  creating http peer for wire protocol version 2

  sending branchmap command

  response: {

    b'branch1': [

      b'\xb5\xfa\xac\xdf\xd2c7h\xcb1R3l\xc0\x953\x81&f\x88'

    ],

    b'branch2': [

      b'"Aa\xc7X\x9a\xa4\x8f\xa8:H\xfe\xff^\x95\xb5j\xe3\'\xfc'

    ],

    b'default': [

      b'&\x80Z\xba\x1e`\n\x82\xe96a\x14\x9f#\x13\x86j"\x1a{',

      b'\xbe\x0e\xf7<\x17\xad\xe3\xfc\x89\xdcAp\x1e\xb9\xfc:\x91\xb5\x82\x82'

    ]

  }

  $ cat error.log