random_generator.rb

# All purpose minimalistic random generator

def random(params)
  if(params.kind_of?(Array))
    return params[rand(params.size)]
  end
  if(params.kind_of?(Range))
    return (rand(params.end - params.begin) + params.begin).to_s
  end
  if(params.kind_of?(Integer))
    value = ""
    params.times do
      value  << (48 + rand(10)).chr
    end
    return value    
  end
  if(params.kind_of?(TrueClass) or params.kind_of?(FalseClass))
    return (rand(2) == 0)
  end
end

def test_random
  print "Testing random helper "
  assert_equals("Should pick random element from array",
         random(['one','two','thr']).length, 3) 
  assert_equals("should generate numbers between range",
         random(10..99).to_s.length, 2)
  assert_equals("should generate a n digit number",
         random(6).length, 6)
  b = random(true)
  assert_equals("Should generate boolean value",
         (b == true || b == false), true)
  puts "All tests passed."
end

def assert_equals(message, expected, actual)
  print "."
  if(expected.to_s != actual.to_s)
    puts "Assert error: #{message}"
    puts "Expected #{expected} got #{actual}"
    exit(1)
  end
end

# test_random() # Uncomment to test