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Contents?: true
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Versions: 66
Compression:
Stored size: 1.74 KB
Contents
local Luhn = require('luhn')
describe('luhn', function()
it('should give the last digit of a number as the check digit', function()
assert.equal(7, Luhn.new('34567'):check_digit())
assert.equal(0, Luhn.new('91370'):check_digit())
end)
it('should determine the addends of a value', function()
local luhn = Luhn.new('12121')
assert.same({ 1, 4, 1, 4, 1 }, luhn:addends())
end)
it('should subtract 9 from any addends >9', function()
local luhn = Luhn.new('8631')
assert.same({ 7, 6, 6, 1 }, luhn:addends())
end)
it('should calculate the checksum of a number by summing the addends', function()
assert.equal(22, Luhn.new('4913'):checksum())
assert.equal(21, Luhn.new('201773'):checksum())
end)
it('should indicate that a number with a checksum indivisible by 0 is not valid', function()
local luhn = Luhn.new('738')
assert.equal(false, luhn:valid())
end)
it('should indicate that a number with a checksum divisible by 0 is valid', function()
local luhn = Luhn.new('8739567')
assert.equal(true, luhn:valid())
end)
it('should create valid numbers by appending the correct check digit', function()
assert.equal('1230', Luhn.create('123'))
assert.equal('8739567', Luhn.create('873956'))
assert.equal('8372637564', Luhn.create('837263756'))
end)
it('should support extremely large input', function()
local luhn = Luhn.new('34598754109846124372104312349048732432143214732140498237142')
assert.equal(2, luhn:check_digit())
assert.equal(268, luhn:checksum())
assert.equal(false, luhn:valid())
assert.equal(
'345987541098461243721043123490487324321432147321404982371420',
Luhn.create('34598754109846124372104312349048732432143214732140498237142')
)
end)
end)
Version data entries
66 entries across 66 versions & 1 rubygems