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like haskell's QuickCheck
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README.md

QueenCheck Build Status Gem Status

QueenCheck is random test library.

Inspired by QuickCheck library in Haskell.

Usage

$ gem install queencheck

or

$ git clone git://github.com/rosylilly/QueenCheck.git QueenCheck
$ cd QueenCheck
$ bundle install
$ bundle exec rake install

CI Report

See Travis-CI

Abstract

let's start DDT(Data Driven Testing)

require 'queencheck'

def plus(x, y)
  x + y
end

prop_Plus = QueenCheck::Testable.new(Integer, Integer) do | x, y |
  plus(x, y) == x + y
end
puts prop_Plus.check.pretty_report
# Tests: 100
#   ✓ Successes  : 100
#   ✗ Failures   :   0
#   ✷ Exceptions :   0

with exception, labeling and where

def div(x, y)
  x / y # => raise ZeroDividedError if y == 0
end

prop_Div = QueenCheck::Testable.new(Integer, Integer) do | x, y |
  div(x, y) == x / y
end
puts prop_Div.check.pretty_report
# Tests: 100
#   ✓ Successes  :  99
#   ✗ Failures   :   1
#   ✷ Exceptions :   1

puts prop_Div.check_with_label(
  "x > y" => proc{|x,y| x > y },
  "x < y" => proc{|x,y| x < y },
  "x = y" => proc{|x,y| x == y },
  "x is 0" => proc{|x,y| x.zero? },
  "y is 0" => proc{|x,y| y.zero? }
).pretty_report
# Tests: 100
#  ✓ Successes  :  99
#    x > y  :  43
#    x < y  :  56
#    x = y  :   0
#    x is 0 :   0
#    y is 0 :   0
#  ✗ Failures   :   1
#    x > y  :   0
#    x < y  :   0
#    x = y  :   1
#    x is 0 :   1
#    y is 0 :   1
#  ✷ Exceptions :   1
#    x > y  :   0
#    x < y  :   0
#    x = y  :   1
#    x is 0 :   1
#    y is 0 :   1

int_generater = Integer.arbitrary.gen # => QueenCheck::Gen
nonzero_integer = int_generater.where{|num| !num.zero? }
prop_DivSuccess = QueenCheck::Testable.new(nonzero_integer, nonzero_integer) do | x, y |
  div(x, y) == x / y
end
puts prop_DivSuccess.check_with_label(
  "x > y" => proc{|x,y| x > y },
  "x < y" => proc{|x,y| x < y },
  "x = y" => proc{|x,y| x == y },
  "x is 0" => proc{|x,y| x.zero? },
  "y is 0" => proc{|x,y| y.zero? }
).pretty_report
# Tests: 99
#   ✓ Successes  : 99
#     x > y  : 55
#     x < y  : 44
#     x = y  :  0
#     x is 0 :  0
#     y is 0 :  0
#   ✗ Failures   :  0
#     x > y  :  0
#     x < y  :  0
#     x = y  :  0
#     x is 0 :  0
#     y is 0 :  0
#   ✷ Exceptions :  0
#     x > y  :  0
#     x < y  :  0
#     x = y  :  0
#     x is 0 :  0
#     y is 0 :  0

Help me

please fork QueenCheck repository.

I'm waiting for the code review of you !

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