neovim/test/functional/options/tabstop_spec.lua

local helpers = require('test.functional.helpers')(after_each)

local clear = helpers.clear
local feed = helpers.feed
local eq = helpers.eq
local eval = helpers.eval

describe("'tabstop' option", function()
  before_each(function()
    clear()
  end)

  -- NOTE: Setting 'tabstop' to a big number reproduces crash #2838.
  -- Disallowing big 'tabstop' would not fix #2838, only hide it.
  it("tabstop=<big-number> does not crash #2838", function()
    -- Insert a <Tab> character for 'tabstop' to work with.
    feed('i<Tab><Esc>')
    -- Set 'tabstop' to a very high value.
    -- Use feed(), not command(), to provoke crash.
    feed(':set tabstop=3000000000<CR>')
    eq(2, eval("1+1"))  -- Still alive?
  end)
end)