--------------------------------------------------------------------------------
-- Lua 5.2 compat

if not setfenv then -- Lua 5.2
  -- based on http://lua-users.org/lists/lua-l/2010-06/msg00314.html
  -- this assumes f is a function
  local function findenv(f)
    local level = 1
    repeat
      local name, value = debug.getupvalue(f, level)
      if name == '_ENV' then return level, value end
      level = level + 1
    until name == nil
    return nil end
  getfenv = function (f) return(select(2, findenv(f)) or _G) end
  setfenv = function (f, t)
    local level = findenv(f)
    if level then debug.setupvalue(f, level, t) end
    return f end
end

--------------------------------------------------------------------------------

local SUITE = require('TestSuite').new('resilience')
SUITE:setEnviroment{
    pretty  = require('pretty'),
    setfenv = setfenv,
}

--------------------------------------------------------------------------------
-- Prevent usage of unknown options.

SUITE:addTest('Dont allow unknown options', function ()
    local error_msg = bad_call(pretty, 'Hello World', { some_random_option = true })
    assert(error_msg)
end)

SUITE:addTest('Dont allow bad types in options', function ()
    local error_msg = bad_call(pretty, 'Hello World', { max_depth = "hello world" })
    assert(error_msg)
end)

SUITE:addTest('Dont allow bad values in recursion', function ()
    local error_msg = bad_call(pretty, 'Hello World', { recursion = "hello world" })
    assert(error_msg)
end)

--------------------------------------------------------------------------------
-- Survive not loading libs


-- TODO: Find a way to test this.


--------------------------------------------------------------------------------
-- Strange standard libs

SUITE:addTest('no_std_lib', function ()
    -- This tests whether one could load the library with an empty env, without
    -- an error.
    local env = {}
    local library = setfenv(loadfile('./library.lua'), env)()

    for func, func_info in pairs(library) do
        error(('For some reason %s is defined in the library'):format(func_info.name))
    end
end)

SUITE:addTest('a_very_small_part_of_math', function ()
    -- This tests whether one could load the library with an empty env, without
    -- an error.
    local env = { debug = debug, math = { abs = math.abs } }
    local library = setfenv(loadfile('./library.lua'), env)()

    assert( library[math.abs], 'Why is math.abs not defined in the library?' )
end)

SUITE:addTest('redefined part of math', function ()
    -- This tests whether the library ignores a redefined function of an
    -- builtin, when defining documentation.
    local env  =  { debug = debug, setfenv = setfenv, loadfile = function() end }
    local library = setfenv(loadfile('./library.lua'), env)()

    assert(     library[env.setfenv],  'Why is setfenv not defined in the library?' )
    assert( not library[env.loadfile], 'Why is loadfile defined in the library?' )
end)

SUITE:addTest('redefined part of math 2', function ()
    -- This tests whether the library allows a redefined function of an
    -- builtin, when defining documentation, due to not being able to determine
    -- the origin of the function.
    local env  =  { setfenv = setfenv, loadfile = function() end }
    local library = setfenv(loadfile('./library.lua'), env)()

    assert( library[env.setfenv],  'Why is setfenv not defined in the library?' )
    assert( library[env.loadfile], 'Why is loadfile not defined in the library?' )
end)

--------------------------------------------------------------------------------

return SUITE