SO 28002853

so_28002853.rb

require "minitest/autorun"                                                       
 12                                                                                  
 11 module Numerics                                                                  
 10   def twenty_one?(*nums)                                                         
  9     nums.inject(&:+) == 21                                                       
  8   end                                                                            
  7 end                                                                              
  6                                                                                  
  5 class TestNumerics < MiniTest::Test                                              
  4   include Numerics                                                               
  3                                                                                  
  2   def test_twenty_one?                                                           
  1     assert_equal twenty_one?(3, 4, 5, 6, 3), true                                
14      assert_equal twenty_one?(3, 11, 10), false                                   
  1   end                                                                            
  2 end

Contribution to http://stackoverflow.com/questions/28002853/ruby-adding-numbers-and-printing-true-when-sums-are-21