lib.lua

--------------------------------------------------------------------------
-- Moonshine - a Lua virtual machine.
--
-- Email: moonshine@gamesys.co.uk
-- http://moonshinejs.org
--
-- Copyright (c) 2013-2015 Gamesys Limited. All rights reserved.
--
-- Permission is hereby granted, free of charge, to any person obtaining
-- a copy of this software and associated documentation files (the
-- "Software"), to deal in the Software without restriction, including
-- without limitation the rights to use, copy, modify, merge, publish,
-- distribute, sublicense, and/or sell copies of the Software, and to
-- permit persons to whom the Software is furnished to do so, subject to
-- the following conditions:
--
-- The above copyright notice and this permission notice shall be
-- included in all copies or substantial portions of the Software.
--
-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
-- EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-- MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
-- IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
-- CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
-- TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
-- SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
--


-------------
-- LIBRARY --
-------------


-- MAIN FUNCTIONS


-- assert
local ass = function (test)
	return assert (test, 'error message')
end

a, b, c = pcall (ass, true)
assertTrue (a, 'Assert should not throw an error when passed true')
assertTrue (b, 'Assert should return the value passed in the first return value')
assertTrue (c == 'error message', 'Assert should return the message passed in the second return value')

a, b, c = pcall (ass, 0)
assertTrue (a, 'Assert should not throw an error when passed 0')

a, b, c = pcall (ass, 1)
assertTrue (a, 'Assert should not throw an error when passed 1')

a, b, c = pcall (ass, '')
assertTrue (a, 'Assert should not throw an error when passed an empty string')

a, b, c = pcall (ass, nil)
assertTrue (not a, 'Assert should throw an error when passed nil')
--assertTrue (b == 'error message', 'Assert should throw an error with the given message')

a, b, c = pcall (ass, false)
assertTrue (not a, 'Assert should throw an error when passed false')






-- getmetatable

local mt = {}
local t = {}
setmetatable(t, mt)

a = getmetatable(t)
b = getmetatable('moo')
c = getmetatable(123)
d = getmetatable({})
e = getmetatable(true)
f = getmetatable(function () end)
g = getmetatable('baa')

assertTrue (a == mt, 'getmetatable() should return a table\'s metatable if set')
assertTrue (type(b) == 'table', 'getmetatable() should return a metatable when passed a string')
assertTrue (b.__index == string, 'getmetatable() should return the string module as a prototype of string')
assertTrue (c == nil, 'getmetatable() should return nil when passed a number')
assertTrue (d == nil, 'getmetatable() should return nil when passed a table without a metatable')
assertTrue (e == nil, 'getmetatable() should return nil when passed a boolean')
assertTrue (f == nil, 'getmetatable() should return nil when passed a function')
assertTrue (g == b, 'The metatable of all strings should be the same table')






-- ipairs

local a = {2,4,8}
local b = ''

for i, v in ipairs(a) do
	b = b..'['..i..'='..v..']'
end

assertTrue (b == '[1=2][2=4][3=8]', 'ipairs() should iterate over table items [1]')


local t = {nil, 1, 2} 
local s = ''

for i, v in ipairs(t) do 
    s = s..tostring(i)..'='..tostring(v)..';'
end

assertTrue (s == '', 'ipairs() should not iterate over nil values in a table.')


t = {3, 4, nil, 1, 2} 
s = ''

for i, v in ipairs(t) do 
    s = s..tostring(i)..'='..tostring(v)..';'
end

assertTrue (s == '1=3;2=4;', 'ipairs() should iterate over values up to but not including nil values in a table.')


t = {
  [0] = "zero",
  [1] = "one",
  [2] = "two",
  [-1] = "negative",
  foo = "string",
  [0.5] = "half"
}

local r = {}

for i, v in ipairs(t) do 
    r[v] = true
end

assertTrue (not r.zero, 'ipairs() should not iterate over zero key')
assertTrue (r.one, 'ipairs() should iterate over positive integer keys [1]')
assertTrue (r.two, 'ipairs() should iterate over positive integer keys [2]')
assertTrue (not r.negative, 'ipairs() should not iterate over negative keys')
assertTrue (not r.string, 'ipairs() should not iterate over string keys')
assertTrue (not r.half, 'ipairs() should not iterate over non-integer numeric keys')




-- -- load

-- if (arg and arg[-1] == 'moonshine') then
-- 	src = '{"sourceName":"@test.lua","lineDefined":0,"lastLineDefined":0,"upvalueCount":0,"paramCount":0,"is_vararg":2,"maxStackSize":2,"instructions":[1,0,0,0,30,0,2,0,30,0,1,0],"constants":["hello"],"functions":[],"linePositions":[82,82,82],"locals":[],"upvalues":[],"sourcePath":"./test.lua"}'
-- else
	-- src = 'return "hello"'
-- end

-- local index = 0
-- local function getChar ()
-- 	index = index + 1
-- 	return string.sub(src, index, index)
-- end

-- local f = load(getChar)
-- assertTrue (type(f) == 'function', 'load() should return a function when passed a valid source string')

-- local result = f();
-- assertTrue (result == 'hello', 'The function returned from load() should return the value from the script')




-- -- loadfile

-- local f = loadfile('scripts/not-a-file.luac')
-- assertTrue (f == nil, 'loadfile() should return nil when passed an invalid filename')


-- mainGlobal1 = 'mainGlbl'
-- mainGlobal2 = 'mainGlbl'

-- local mainLocal = 'mainLoc'

-- f = loadfile('lib-loadfile.lua')
-- assertTrue (type(f) == 'function', 'loadfile() should return a function when passed a valid filename')

-- local result = f();

-- assertTrue (type(result) == 'table', 'The function returned from loadfile() should return the value from the script')
-- assertTrue (type(result.getValue) == 'function', 'The function returned from loadfile() should return the value that is returned from the script[1]')
-- assertTrue (result.getValue() == 'moo', 'The function returned from loadfile() should return the value that is returned from the script[2]')

-- assertTrue (mainGlobal1 == 'innerGlbl', 'The function returned from loadfile() should share the same global namespace as the outer script[1]')
-- assertTrue (mainGlobal2 == 'mainGlbl', 'The function returned from loadfile() should share the same global namespace as the outer script[2]')
-- assertTrue (innerLocal == nil, 'Function locals should not leak into outer environment in a loadfile() function call')




-- loadstring

local src = 'return "hello"'

local f = loadstring(src)
assertTrue (type(f) == 'function', 'loadstring() should return a function when passed a valid source string')

local result = f()
assertTrue (result == 'hello', 'The function returned from loadstring() should return the value from the script')

-- Note: loadstring() is also tested with binary 
-- strings in string.dump() tests.



-- pairs

local a, b = "", {foo=1}
b["bar"] = "Hello",
table.insert(b, 123)

for i, v in pairs(b) do
	a = a..i..':'..v..';'
end

assertTrue (#a == #'1:123;bar:Hello;foo:1;', 'pairs() should iterate over table items [2]')	-- Have to compare lengths because order is arbitrary


local t = {
  [0] = "zero",
  [1] = "one",
  [-1] = "negative",
  foo = "string",
  [0.5] = "half"
}
local r = {}

for i, v in pairs(t) do 
    r[v] = true
end

assertTrue (r.zero, 'pairs() should iterate over zero key')
assertTrue (r.one, 'pairs() should iterate over positive integer keys')
assertTrue (r.negative, 'pairs() should iterate over negative keys')
assertTrue (r.string, 'pairs() should iterate over string keys')
assertTrue (r.half, 'pairs() should iterate over non-integer numberic keys')


t = { nil, nil, 123 }
a = ''

for i, v in pairs(t) do
	a = a..i..':'..v..';'
end

assertTrue (a == '3:123;', 'pairs() should iterate over numeric table items')


t = {}
t[10] = {}
t[15] = {}
s = ''

for i in pairs(t) do
	s = s..i..';'
end

assertTrue (s == '10;15;', 'pairs() should return correct numeric keys')




-- pcall

function goodfunc (x) 
	return x + 1, x + 2
end 

function badfunc ()
	error ('I\'m bad.')
end 

a, b, c = pcall (goodfunc, 6)

assertTrue (a == true, 'pcall() should return true in the first item when a function executes successfully')
assertTrue (b == 7, 'pcall() should return the result of the function in the items following the first item returned, when a function executes successfully [1]')
assertTrue (c == 8, 'pcall() should return the result of the function in the items following the first item returned, when a function executes successfully [2]')


a, b, c = pcall (badfunc, 6)

assertTrue (a == false, 'pcall() should return false in the first item when the function errors during execution')
assertTrue (not (b == nil), 'pcall() should return an error message in the second item when the function error during execution')
assertTrue (c == nil, 'pcall() should only return 2 items when the function error during execution')





-- rawequal
-- rawget
-- rawset

-- TODO




-- require
	
mainGlobal1 = 'mainGlbl'
mainGlobal2 = 'mainGlbl'
moduleInitCount = 0

local mainLocal = 'mainLoc'

local result = require 'lib-require'

assertTrue (type(result) == 'table', 'require() should return a table')
assertTrue (type(result.getValue) == 'function', 'require() should return the value that is returned from the module[1]')
assertTrue (result.getValue() == 'modVal', 'require() should return the value that is returned from the module[2]')

assertTrue (package.loaded['lib-require'] == result, 'Module loaded by require() should also be available in package.loaded[modname]')

assertTrue (moduleInitCount == 1, 'require() should initialise module')
assertTrue (mainGlobal1 == 'innerGlbl', 'require() should pass the same global namespace into the module[1]')
assertTrue (mainGlobal2 == 'mainGlbl', 'require() should pass the same global namespace into the module[2]')
assertTrue (innerLocal == nil, 'Module locals should not leak into outer environment in a require() call')

local result2 = require 'lib-require'
assertTrue (moduleInitCount == 1, 'require() should only initialise a module once')
assertTrue (result == result2, 'require() should return the same value across multiple calls')




-- select

local a, b, c, d = select (3, 2, 4, 6, 8, 10)

assertTrue (a == 6, 'select() should return its own arguments from the (n + 1)th index, where n is the value of the first argument [1]')
assertTrue (b == 8, 'select() should return its own arguments from the (n + 1)th index, where n is the value of the first argument [2]')
assertTrue (c == 10, 'select() should return its own arguments from the (n + 1)th index, where n is the value of the first argument [3]')
assertTrue (d == nil, 'select() should return its own arguments from the (n + 1)th index, where n is the value of the first argument [4]')


local a, b = select ('#', 2, 4, 6, 8, 10)

assertTrue (a == 5, 'select() should return the total number of arguments - 1, when the first argument is "#" [1]')
assertTrue (b == nil, 'select() should return the total number of arguments - 1, when the first argument is "#" [2]')


local f = function ()
	local x, y = select ('moo', 2, 4, 6, 8, 10)
end

local a, b = pcall (f)

assertTrue (a == false, 'select() should error if the first argument is not a number or a string with the value of "#"')




-- setmetatable
-- TODO




-- tonumber

local a = tonumber ('1234')
local b = tonumber ('1234 ')
local c = tonumber (' 1234 ')
local d = tonumber ('1234abc')
local e = tonumber ('1234 12')
local f = tonumber ('1.234')
local g = tonumber ('1.234e+5')
local h = tonumber ('1.234e-5')

assertTrue (a == 1234, 'tonumber() should convert basic numeric strings to decimal and default to base 10')
assertTrue (b == 1234, 'tonumber() should convert numeric strings suffixed with spaces [1]')
assertTrue (c == 1234, 'tonumber() should convert numeric strings prefixed with spaces [1]')
assertTrue (d == nil, 'tonumber() should not convert strings containing letters [1]')
assertTrue (e == nil, 'tonumber() should not convert numeric strings containing spaces in the middle [1]')
assertTrue (f == 1.234, 'tonumber() should convert numeric strings of floating point numbers at base 10 [1]')
assertTrue (g == 123400, 'tonumber() should convert numeric strings of exponential (+ve) numbers at base 10 [1]')
assertTrue (h == 0.00001234, 'tonumber() should convert numeric strings of exponential (-ve) numbers at base 10 [1]')


local a = tonumber ('1234', 10)
local b = tonumber ('1234 ', 10)
local c = tonumber (' 1234 ', 10)
local d = tonumber ('1234abc', 10)
local e = tonumber ('1234 12', 10)
local f = tonumber ('1.234', 10)
local g = tonumber ('1.234e+5', 10)
local h = tonumber ('1.234e-5', 10)

assertTrue (a == 1234, 'tonumber() should convert basic numeric strings to decimal with base 10')
assertTrue (b == 1234, 'tonumber() should convert numeric strings suffixed with spaces [2]')
assertTrue (c == 1234, 'tonumber() should convert numeric strings prefixed with spaces [2]')
assertTrue (d == nil, 'tonumber() should not convert strings containing letters [2]')
assertTrue (e == nil, 'tonumber() should not convert numeric strings containing spaces in the middle [2]')
assertTrue (f == 1.234, 'tonumber() should convert numeric strings of floating point numbers at base 10 [2]')
assertTrue (g == 123400, 'tonumber() should convert numeric strings of exponential (+ve) numbers at base 10 [2]')
assertTrue (h == 0.00001234, 'tonumber() should convert numeric strings of exponential (-ve) numbers at base 10 [2]')


local a = tonumber ('101', 2)
local b = tonumber ('101 ', 2)
local c = tonumber (' 101 ', 2)
local d = tonumber ('101abc', 2)
local e = tonumber ('101 10', 2)
local f = tonumber ('101.10', 2)
local g = tonumber ('1.01e+10', 2)

assertTrue (a == 5, 'tonumber() should convert basic numeric strings to decimal with base 2')
assertTrue (b == 5, 'tonumber() should convert numeric strings suffixed with spaces with base 2')
assertTrue (c == 5, 'tonumber() should convert numeric strings prefixed with spaces with base 2')
assertTrue (d == nil, 'tonumber() should not convert strings containing letters with base 2')
assertTrue (e == nil, 'tonumber() should not convert numeric strings containing spaces in the middle with base 2')
assertTrue (f == nil, 'tonumber() should not convert numeric strings of floating point numbers at base 2')
assertTrue (g == nil, 'tonumber() should not convert numeric strings of exponential numbers at base 2')


local a = tonumber ('123', 16)
local b = tonumber ('1AF', 16)
local c = tonumber ('1AF ', 16)
local d = tonumber (' 1AF ', 16)
local e = tonumber ('123Axyz', 16)
local f = tonumber ('123 45', 16)
local g = tonumber ('123.4', 16)
local h = tonumber ('1.23e+10', 16)

assertTrue (a == 291, 'tonumber() should convert basic numeric strings to decimal with base 16')
assertTrue (b == 431, 'tonumber() should convert hexadecimal strings to decimal with base 16')
assertTrue (c == 431, 'tonumber() should convert hexadecimal strings suffixed with spaces with base 16')
assertTrue (d == 431, 'tonumber() should convert hexadecimal strings prefixed with spaces with base 16')
assertTrue (e == nil, 'tonumber() should not convert strings containing letters out of the range of hexadecimal, with base 16')
assertTrue (f == nil, 'tonumber() should not convert hexadecimal strings containing spaces in the middle with base 16')
assertTrue (g == nil, 'tonumber() should not convert hexadecimal strings of floating point numbers at base 16')
assertTrue (h == nil, 'tonumber() should not convert hexadecimal strings of exponential numbers at base 16')


local a = tonumber ('')
local b = tonumber ('', 2)
local c = tonumber ('', 10)
local d = tonumber ('', 16)
assertTrue (a == nil, 'tonumber() should return nil with passed an empty string')
assertTrue (b == nil, 'tonumber() should return nil with passed an empty string with base 2')
assertTrue (c == nil, 'tonumber() should return nil with passed an empty string with base 10')
assertTrue (d == nil, 'tonumber() should return nil with passed an empty string with base 16')

local a = tonumber (nil)
local b = tonumber (0/0)
local c = tonumber (math.huge)
local d = tonumber (-math.huge)
assertTrue (a == nil, 'tonumber() should return nil when passed nil')
assertTrue (b ~= b, 'tonumber() should return nan when passed nan')
assertTrue (c == math.huge, 'tonumber() should return a number when passed inf')
assertTrue (d == -math.huge, 'tonumber() should return a number when passed -inf')

local a = tonumber (123)
local b = tonumber (-123)
local c = tonumber (0)
local d = tonumber { value = 123 }
local e = tonumber (function () return 123 end)

assertTrue (a == 123, 'tonumber() should return a number when passed a number')
assertTrue (b == -123, 'tonumber() should return a negative number when passed a negative number')
assertTrue (c == 0, 'tonumber() should return a zero when passed a zero')
assertTrue (d == nil, 'tonumber() should return nil when passed a table')
assertTrue (e == nil, 'tonumber() should return nil when passed a function')

local a = tonumber ('0xa.2')
local b = tonumber ('0xa.2', 10)
local c = tonumber ('0xa.2', 16)
local d = tonumber ('0xa', 10)
local e = tonumber ('0xa', 16)
local f = tonumber ('0xa', 12)

assertTrue (a == 10.125, 'tonumber() should coerce string when using base 10 [1]')
assertTrue (b == 10.125, 'tonumber() should coerce string when using base 10 [2]')
assertTrue (c == nil, 'tonumber() should return nil when string is invalid [1]')
assertTrue (d == 10, 'tonumber() should coerce string when using base 10 [3]')
assertTrue (e == 10, 'tonumber() should ignore leading "0x" when converting to base 16.')
assertTrue (f == nil, 'tonumber() should return nil when string is invalid [2]')

local a = tonumber (10, 16)
local b = tonumber (0xa, 16)
local c = tonumber ('0xa', 34)
local d = tonumber ('inf')
local e = tonumber ('inf', 16)
local f = tonumber (math.huge, 16)

assertTrue (a == 16, 'tonumber() should coerce first argument to a string [1]')
assertTrue (b == 16, 'tonumber() should coerce first argument to a string [2]')
assertTrue (c == 1132, 'tonumber() should convert "x" correctly for bases greater than 33')
assertTrue (d == math.huge, 'tonumber() should coerce "inf" to inf with base 10')
assertTrue (e == nil, 'tonumber() should coerce "inf" to nil with bases other than 10')
assertTrue (f == nil, 'tonumber() should return nil when passed inf with bases other than 10')

local a = tonumber (0/0, 16)

assertTrue (a == nil, 'tonumber() should return nil when passed inf for bases other than 10')



-- tostring
-- TODO Check for use of __tostring metamethod

a = tostring (123)
b = tostring ({})
c = tostring ({1, 2, 3})
d = tostring (function () return true end)
e = tostring(math.huge)
f = tostring(-math.huge)
g = tostring(0/0)
h = tostring(true)
 
assertTrue (a == '123', 'tostring() should convert a number to a string')
assertTrue (string.sub(b, 1, 9) == 'table: 0x', 'tostring() should convert an empty table to a string')
assertTrue (string.sub(c, 1, 9) == 'table: 0x', 'tostring() should convert a table to a string')
assertTrue (string.sub(d, 1, 12) == 'function: 0x', 'tostring() should convert a function to a string')
assertTrue (e == 'inf', 'tostring() should convert infinity to "inf"')
assertTrue (f == '-inf', 'tostring() should convert negative infinity to "-inf"')
assertTrue (g == 'nan', 'tostring() should convert not-a-number to "nan"')
assertTrue (h == 'true', 'tostring() should convert a boolean to a string')

a = tostring ('')
b = tostring ('moo')
c = tostring (0)
d = tostring (false)

assertTrue (a == '', 'tostring() should convert a zero-length string to a string')
assertTrue (b == 'moo', 'tostring() should convert a non-zero-length string to a string')
assertTrue (c == '0', 'tostring() should convert zero to a string')
assertTrue (d == 'false', 'tostring() should convert false to a string')


a = {}
setmetatable(a, { __tostring = function () return 'Les Revenants' end })
b = tostring (a)

assertTrue (b == 'Les Revenants', 'tostring() should use __tostring function, if available on metatable')





-- type

local a = type (nil)
local b = type (123)
local c = type ('abc')
local d = type (true)
local e = type ({})
local f = type (function () return true end)

assertTrue (a == 'nil', 'type() should return "nil" for a variable with value of nil')
assertTrue (b == 'number', 'type() should return "number" for a variable with value of number')
assertTrue (c == 'string', 'type() should return "string" for a variable with value of type string')
assertTrue (d == 'boolean', 'type() should return "boolean" for a variable with value of type boolean')
assertTrue (e == 'table', 'type() should return "table" for a variable with value of type table')
assertTrue (f == 'function', 'type() should return "function" for a variable with value of type function')



-- unpack
do
	local a = {0, 1, 2, 4, 20, 50, 122}
	
	local b, c, d, e, f, g = unpack (a, 3);
	local h, i = unpack (a, 3, 2);
	local j, k, l, m = unpack (a, 3, 5);
	
	assertTrue (b == 2, 'unpack() should return the correct items of the given list [1]')
	assertTrue (c == 4, 'unpack() should return the correct items of the given list [2]')
	assertTrue (d == 20, 'unpack() should return the correct items of the given list [3]')
	assertTrue (e == 50, 'unpack() should return the correct items of the given list [4]')
	assertTrue (f == 122, 'unpack() should return the correct items of the given list [5]')
	assertTrue (g == nil, 'unpack() should return the correct items of the given list [6]')
	assertTrue (h == nil, 'unpack() should return the correct items of the given list [7]')
	assertTrue (i == nil, 'unpack() should return the correct items of the given list [8]')
	assertTrue (j == 2, 'unpack() should return the correct items of the given list [9]')
	assertTrue (k == 4, 'unpack() should return the correct items of the given list [10]')
	assertTrue (l == 20, 'unpack() should return the correct items of the given list [11]')
	assertTrue (m == nil, 'unpack() should return the correct items of the given list [12]')
	
	
	local a = {nil, nil, 180}
	local b, c, d, e = unpack (a);
	assertTrue (b == nil, 'unpack() should return the correct items of the given list [13]')
	assertTrue (c == nil, 'unpack() should return the correct items of the given list [14]')
	assertTrue (d == 180, 'unpack() should return the correct items of the given list [15]')
	assertTrue (e == nil, 'unpack() should return the correct items of the given list [16]')
	
	
	--Make sure binary searching is implemented the same way as C…
	local table1 = {true, nil, true, false, nil, true, nil}
	local table2 = {true, false, nil, false, nil, true, nil}
	local table3 = {true, false, false, false, true, true, nil}
	
	local a1, b1, c1, d1, e1, f1 = unpack (table1);
	local a2, b2, c2, d2, e2, f2 = unpack (table2);
	local a3, b3, c3, d3, e3, f3, g3 = unpack (table3);
	
	
	assertTrue (a1, 'unpack() should return the same items as the C implementation [1]')
	assertTrue (b1 == nil, 'unpack() should return the same items as the C implementation [2]')
	assertTrue (c1, 'unpack() should return the same items as the C implementation [3]')
	assertTrue (not d1, 'unpack() should return the same items as the C implementation [4]')
	assertTrue (e1 == nil, 'unpack() should return the same items as the C implementation [5]')
	assertTrue (f1 == nil, 'unpack() should return the same items as the C implementation [6]')
	assertTrue (a2, 'unpack() should return the same items as the C implementation [7]')
	assertTrue (not b2, 'unpack() should return the same items as the C implementation [8]')
	assertTrue (c2 == nil, 'unpack() should return the same items as the C implementation [9]')
	assertTrue (d2 == nil, 'unpack() should return the same items as the C implementation [10]')
	assertTrue (e2 == nil, 'unpack() should return the same items as the C implementation [11]')
	assertTrue (f2 == nil, 'unpack() should return the same items as the C implementation [12]')
	
	assertTrue (a3, 'unpack() should return the same items as the C implementation [13]')
	assertTrue (not b3, 'unpack() should return the same items as the C implementation [14]')
	assertTrue (not c3, 'unpack() should return the same items as the C implementation [15]')
	assertTrue (not d3, 'unpack() should return the same items as the C implementation [16]')
	assertTrue (e3, 'unpack() should return the same items as the C implementation [17]')
	assertTrue (f3, 'unpack() should return the same items as the C implementation [18]')
	assertTrue (g3 == nil, 'unpack() should return the same items as the C implementation [19]')
end



-- _VERSION

assertTrue (_VERSION == 'Lua 5.1', '_VERSION should be "Lua 5.1"')




-- xpcall

function goodfunc ()
	return 10, "win"
end

function badfunc ()
	error ('I\'m bad.')
end 

function errfunc ()
	return 999, "fail"
end 

a, b, c, d = xpcall (goodfunc, errfunc)

assertTrue (a == true, 'xpcall() should return true in the first item when a function executes successfully')
assertTrue (b == 10, 'xpcall() should return the result of the function in the items following the first item returned, when a function executes successfully [1]')
assertTrue (c == 'win', 'xpcall() should return the result of the function in the items following the first item returned, when a function executes successfully [2]')
assertTrue (d == nil, 'xpcall() should return the result of the function in the items following the first item returned, when a function executes successfully [3]')

a, b, c = xpcall (badfunc, errfunc)

assertTrue (a == false, 'xpcall() should return false in the first item when the function errors during execution')
assertTrue (b == 999, 'xpcall() should return the first item of the result of the error function in the second item returned, when the function errors during execution')
assertTrue (c == nil, 'xpcall() should only return the first item of the result of the error function in the items following the first item returned, when the function errors during execution')