This tests that group should fail:

https://github.com/mongodb/mongo/blob/r2.6.0-rc0/jstests/replsets/maintenance2.js#L51

However, the group command actually succeeds but the test still passes anyway because db here is undefined:

https://github.com/mongodb/mongo/blob/r2.6.0-rc0/jstests/replsets/maintenance2.js#L4

Note: the count command below actually fails with:

{ "note" : "from execCommand", "ok" : 0, "errmsg" : "node is recovering" }