a = {1,2,3,4}
b = a

assertTrue (a == b, 'Tables should be able to be compared by identity')
assertTrue (not (a == {1,2,3,4}), 'Tables should not be able to be compared to literals')
assertTrue (#a == 4, 'Length operator should return the number of items in a table')


assertTrue (a[1] == 1, 'Square brackets operation on table should return correct value for index [1]')
assertTrue (a[2] == 2, 'Square brackets operation on table should return correct value for index [2]')
assertTrue (a[3] == 3, 'Square brackets operation on table should return correct value for index [3]')
assertTrue (a[4] == 4, 'Square brackets operation on table should return correct value for index [4]')
assertTrue (a[5] == nil, 'Square brackets operation on table should return nil for an index greater than the length')
assertTrue (a[0] == nil, 'Square brackets operation on table should return nil for an index of 0')
assertTrue (a[-1] == nil, 'Square brackets operation on table should return nil for an index less than 0')


a = {[1] = 20, [3] = 40}
assertTrue (a[1] == 20, 'Square brackets operation on table should return correct value for index when keys are used in literal assignment [1]')
assertTrue (a[2] == nil, 'Square brackets operation on table should return correct value for index when keys are used in literal assignment [2]')
assertTrue (a[3] == 40, 'Square brackets operation on table should return correct value for index when keys are used in literal assignment [3]')
assertTrue (a[4] == nil, 'Square brackets operation on table should return correct value for index when keys are used in literal assignment [4]')

b = 'hello'
a = {[b] = 'value'}
assertEqual (a.hello, 'value', 'Identifier should be able to be used as a key')

b = 2
a = {[b] = 'value2'}
assertEqual (a[2], 'value2', 'Numeric identifier should be able to be used as a key')




-- TABLES


Account = { balance = 0 }

function Account:new (o)
	o = o or {}
	setmetatable (o,self)
	self.__index = self
	return o
end

function Account:deposit (v)
	self.balance = self.balance + v
end

function Account:withdraw (v)
	if v > self.balance then error "insufficient funds" end
	self.balance = self.balance - v
end


acc = Account:new ()


assertTrue (acc.balance == 0, 'Class properties should be initiated when instantiated [1]')

acc:deposit (20)
assertTrue (acc.balance == 20, 'Class instance properties should be updatable though instance method calls [1]')

acc:withdraw (5)
assertTrue (acc.balance == 15, 'Class instance properties should maintain their value in the instance')


acc2 = Account:new ()

assertTrue (acc2.balance == 0, 'Class properties should be initiated when instantiated [2]')

acc2:deposit (50)
assertTrue (acc2.balance == 50, 'Class instance properties should be updatable though instance method calls [2]')
assertTrue (acc.balance == 15, 'Class instance properties should maintain their value separate to other instances')



SpecialAccount = Account:new ()

function SpecialAccount:withdraw (v)
	if v - self.balance >= self:getLimit () then
		error "insufficient funds"
	end

	self.balance = self.balance - v
end

function SpecialAccount:getLimit ()
	return self.limit or 0
end


s = SpecialAccount:new {limit=1000.00}

assertTrue (s.balance == 0, 'Class properties should be initiated when instantiated, even if class is inherited')
assertTrue (s:getLimit () == 1000, 'Inherited class should have its own properties')
assertTrue (acc.getLimit == nil, 'Base class properties should not change when inherited class manipulated')

s:deposit (500)
assertTrue (s.balance == 500, 'Class instance properties should be updatable though instance method calls [3]')


function f ()
	return 1, 3, 9
end

local t = {f()}

assertTrue (t[1] == 1, 'Table should be able to be instantiated by the result of a function [1]')
assertTrue (t[2] == 3, 'Table should be able to be instantiated by the result of a function [2]')
assertTrue (t[3] == 9, 'Table should be able to be instantiated by the result of a function [3]')



t = {}
t[1] = 'number'
t['1'] = 'string'

assertTrue (t[1] == 'number', 'A numerical table index should return a different value than when using the same index as a sting. [1]')
assertTrue (t['1'] == 'string', 'A numerical table index should return a different value than when using the same index as a sting. [2]')



function testUnpack()
	return 1, 2, 3
end

t = { testUnpack(), 10 }
assertTrue (t[1] == 1, 'Function call in table literal should pass return value as argument')
assertTrue (t[2] == 10, 'Function call in middle of table literal should only pass one argument')
assertTrue (t[3] == nil, 'Table properties should stop at the end of table literal list')

t = { 10, testUnpack() }
assertTrue (t[1] == 10, 'Table literal should set properties in order')
assertTrue (t[2] == 1, 'Function call in table literal should set properties')
assertTrue (t[3] == 2, 'Function call at end of table literal should set properties for all return values')