minetest.register_abm({
    label = "Sponge Loop",
    nodenames = {"pyutest_core:sponge"},
    neighbors = {"group:liquid"},
    interval = 0,
    chance = 1,
    action = function (pos)
      local range = 4

      local function replace(npos)
	local node = minetest.get_node(npos)
	if node.name == "air" then return end
	local def = minetest.registered_nodes[node.name]

	if def.groups["liquid"] == 1 then
	  minetest.remove_node(npos)
	end
      end

      PyuTestCore.dorange(pos, range, function(p)
	  replace(p)
      end)
    end
})

minetest.register_abm({
    label = "Contagious Acid Spread",
    nodenames = {"group:acid_vulnerable"},
    neighbors = {"pyutest_core:contagious_acid"},
    interval = 3.4,
    chance = 3.7,
    catchup = true,
    action = function (pos)
      minetest.set_node(pos, {
	  name = "pyutest_core:contagious_acid"
      })
    end
})

minetest.register_abm({
    label = "Fire Spread",
    nodenames = {"group:flammable"},
    neighbors = {"pyutest_core:fire"},
    interval = 1,
    chance = 4,
    action = function (pos)
      minetest.set_node(pos, {
	  name = "pyutest_core:fire"
      })
    end
})