mtn_setup()
revs = {}

addfile("foo", "blah")
commit()
revs.base = base_revision()

for i = 1,4 do
  revert_to(revs.base)
  addfile(tostring(i), tostring(i))
  commit()
  revs[i] = base_revision()
end
table.sort(revs)
for _,x in ipairs(revs) do append("wanted_heads", x.."\n") end
canonicalize("wanted_heads")


check(mtn("automate", "heads", "testbranch"), 0, true, false)
canonicalize("stdout")
check(samefile("wanted_heads", "stdout"))

check(mtn("automate", "heads", "nosuchbranch"), 0, true, false)
writefile("empty")
check(samefile("empty", "stdout"))