switcharoo_test

switcharoo_test.rb

# run with: ruby switcharoo_test.rb

require 'minitest/autorun'

def switcharoo(string, switch_point, delimiter=false)
  if switch_point < 0
  	raise "switch_point too small"
  elsif switch_point > string.size
   	raise "switch_point too big"
  end

  # first = string.slice(0...switch_point)
  # second = string.slice(switch_point..-1)
 
  # lasse
  # if delimiter == true
  # 	string.slice(switch_point..-1) << "|" + string.slice(0...switch_point)
  # elsif delimiter == false 
  # 	string.slice(switch_point..-1) + string.slice(0...switch_point)
  # end

  # ferdi
  # delimiter ? (second + "|" + first) : (second + first)

  # ben
  # second += "|" if delimiter
  # second + first

  if delimiter
  	second + "|" + first
  else
  	second + first
  end
end

class SwitcharooTest < MiniTest::Unit::TestCase
  def test_switch_in_the_middle
  	switch_string = switcharoo("pdqxyz", 3)
    assert_equal("xyzpdq", switch_string)
  end

  def test_switch_point_too_big
  	begin
		result = switcharoo("pdqxyz", 99)
		assert false, "switcharoo returned a result of #{result}"
	rescue => errormessage #Exception
		puts errormessage.message
		assert_equal("switch_point too big", errormessage.message)
  	end
  end

  def test_switch_point_too_small
  	begin
		result = switcharoo("pdqxyz", -99)
		assert false, "switcharoo returned a result of #{result}"
	rescue => errormessage #Exception
		puts errormessage.message
		assert_equal("switch_point too small", errormessage.message)
  	end
  end

  def test_pipe_added_when_delimiter_true
  	switch_string = switcharoo("abcd", 1, true)
    assert_equal("bcd|a", switch_string)
  end

end