lua-in-js/tests/starlight/coercion.lua

assertTrue (0, 'Zero should coerce to true.')
assertTrue (1, 'Positive number should coerce to true.')
assertTrue (-1, 'Negative number should coerce to true.')
assertTrue ('Test', 'String should coerce to true.')
assertTrue ('', 'Empty string should coerce to true.')

assertTrue (0 + '123' == 123, 'Integer strings should coerce to integers')
assertTrue (0 + '123.45' == 123.45, 'Floating point strings should coerce to floats')
assertTrue (0 + '0xa' == 10, 'Hexidecimal syntax strings should coerce to decimal integers')
assertTrue (0 + '0xa.2' == 10.125, 'Floating point hexidecimal syntax strings should coerce to decimal floats')
assertTrue (0 + '0123' == 123, 'JS Octal syntax strings should be coerced as normal decimal strings in Lua')

assertTrue (0 + '-123' == -123, 'Negative integer strings should coerce to negative integers')
assertTrue (0 + '-0xa.2' == -10.125, 'Negative floating point hexidecimal syntax strings should coerce to negative decimal floats')
assertTrue (0 + 'inf' == math.huge, '"inf" should coerce to inf')
assertTrue (0 + '-inf' == -math.huge, '"-inf" should coerce to negative inf')

local a = 0 + 'nan'
assertTrue (a ~= a, '"nan" should coerce to nan')


assertTrue (not (nil), 'Nil should coerce to false.')
assertTrue (not (false), 'False should be false.')
assertTrue (not (10 == '10'), 'String should coerce to number.')



-- TYPE ERRORS

function conc (a, b)
	return a..b
end

a = pcall (conc, 'a', 'b')
b = pcall (conc, 'a', 44)
c = pcall (conc, 55, 'b')
d = pcall (conc, 55, 44)
e = pcall (conc, 'a', {})
f = pcall (conc, {}, 'b')
g = pcall (conc, 'a', os.date)

assertTrue (a, 'Concatenation should not error with two strings')
assertTrue (b, 'Concatenation should not error with a string and a number')
assertTrue (c, 'Concatenation should not error with a number and a string')
assertTrue (d, 'Concatenation should not error with two numbers')
assertTrue (not (e), 'Concatenation should error with a string and a table')
assertTrue (not (f), 'Concatenation should error with a table and a string')
assertTrue (not (g), 'Concatenation should error with a string and a function')


function add (a, b)
	return a + b
end

a = pcall (add, 'a', 'b')
b = pcall (add, 'a', 44)
c = pcall (add, 55, 'b')
d = pcall (add, 55, 44)
e = pcall (add, 'a', {})
f = pcall (add, {}, 'b')
g = pcall (add, 'a', os.date)

assertTrue (not (a), 'Addition operator should error with two strings')
assertTrue (not (b), 'Addition operator should error with a string and a number')
assertTrue (not (c), 'Addition operator should error with a number and a string')
assertTrue (d, 'Addition operator should not error with two numbers')
assertTrue (not (e), 'Addition operator should error with a string and a table')
assertTrue (not (f), 'Addition operator should error with a table and a string')
assertTrue (not (g), 'Addition operator should error with a string and a function')


function sub (a, b)
	return a - b
end

a = pcall (sub, 'a', 'b')
b = pcall (sub, 'a', 44)
c = pcall (sub, 55, 'b')
d = pcall (sub, 55, 44)
e = pcall (sub, 'a', {})
f = pcall (sub, {}, 'b')
g = pcall (sub, 'a', os.date)

assertTrue (not (a), 'Subtraction operator should error with two strings')
assertTrue (not (b), 'Subtraction operator should error with a string and a number')
assertTrue (not (c), 'Subtraction operator should error with a number and a string')
assertTrue (d, 'Subtraction operator should not error with two numbers')
assertTrue (not (e), 'Subtraction operator should error with a string and a table')
assertTrue (not (f), 'Subtraction operator should error with a table and a string')
assertTrue (not (g), 'Subtraction operator should error with a string and a function')


function mult (a, b)
	return a * b
end

a = pcall (mult, 'a', 'b')
b = pcall (mult, 'a', 44)
c = pcall (mult, 55, 'b')
d = pcall (mult, 55, 44)
e = pcall (mult, 'a', {})
f = pcall (mult, {}, 'b')
g = pcall (mult, 'a', os.date)

assertTrue (not (a), 'Multiplication operator should error with two strings')
assertTrue (not (b), 'Multiplication operator should error with a string and a number')
assertTrue (not (c), 'Multiplication operator should error with a number and a string')
assertTrue (d, 'Multiplication operator should not error with two numbers')
assertTrue (not (e), 'Multiplication operator should error with a string and a table')
assertTrue (not (f), 'Multiplication operator should error with a table and a string')
assertTrue (not (g), 'Multiplication operator should error with a string and a function')


function divide (a, b)
	return a / b
end

a = pcall (divide, 'a', 'b')
b = pcall (divide, 'a', 44)
c = pcall (divide, 55, 'b')
d = pcall (divide, 55, 44)
e = pcall (divide, 'a', {})
f = pcall (divide, {}, 'b')
g = pcall (divide, 'a', os.date)

assertTrue (not (a), 'Division operator should error with two strings')
assertTrue (not (b), 'Division operator should error with a string and a number')
assertTrue (not (c), 'Division operator should error with a number and a string')
assertTrue (d, 'Division operator should not error with two numbers')
assertTrue (not (e), 'Division operator should error with a string and a table')
assertTrue (not (f), 'Division operator should error with a table and a string')
assertTrue (not (g), 'Division operator should error with a string and a function')


function modu (a, b)
	return a % b
end

a = pcall (modu, 'a', 'b')
b = pcall (modu, 'a', 44)
c = pcall (modu, 55, 'b')
d = pcall (modu, 55, 44)
e = pcall (modu, 'a', {})
f = pcall (modu, {}, 'b')
g = pcall (modu, 'a', os.date)

assertTrue (not (a), 'Modulo operator should error with two strings')
assertTrue (not (b), 'Modulo operator should error with a string and a number')
assertTrue (not (c), 'Modulo operator should error with a number and a string')
assertTrue (d, 'Modulo operator should not error with two numbers')
assertTrue (not (e), 'Modulo operator should error with a string and a table')
assertTrue (not (f), 'Modulo operator should error with a table and a string')
assertTrue (not (g), 'Modulo operator should error with a string and a function')


function power (a, b)
	return a ^ b
end

a = pcall (power, 'a', 'b')
b = pcall (power, 'a', 44)
c = pcall (power, 55, 'b')
d = pcall (power, 55, 44)
e = pcall (power, 'a', {})
f = pcall (power, {}, 'b')
g = pcall (power, 'a', os.date)

assertTrue (not (a), 'Exponentiation operator should error with two strings')
assertTrue (not (b), 'Exponentiation operator should error with a string and a number')
assertTrue (not (c), 'Exponentiation operator should error with a number and a string')
assertTrue (d, 'Exponentiation operator should not error with two numbers')
assertTrue (not (e), 'Exponentiation operator should error with a string and a table')
assertTrue (not (f), 'Exponentiation operator should error with a table and a string')
assertTrue (not (g), 'Exponentiation operator should error with a string and a function')


function neg (a)
	return -a
end

a = pcall (neg, 'a')
b = pcall (neg, 55)
c = pcall (neg, {})

assertTrue (not (a), 'Negation operator should error when passed a string')
assertTrue (b, 'Negation operator should not error when passed a number')
assertTrue (not (c), 'Negation operator should error when passed a table')