From: Josh Cheek <josh.cheek@...>
Date: 2009-12-30T07:05:42+09:00
Subject: Re: Creating my own method for sorting an array

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Sigh, just so we can move on:
If you run this, and the tests pass, then your sort function probably works.

If you need a tip, here is the code I wrote to make it pass
http://pastie.org/760568


require 'test/unit'

def sort( unsorted , sorted = Array.new )
  # your code here
end

def get_index_of_min( ary )
  # your code here
end


class SortTest < Test::Unit::TestCase
  def test_single_chars
    assert_equal ['a','b','c','d'] , sort(['c', 'b', 'a', 'd'])
  end
  def test_double_chars
    assert_equal ['ab','cd','ef','gh','ij','kl'] ,
sort(['ab','kl','ij','cd','gh','ef'])
  end
  def test_numbers
    assert_equal [1,2,3,4] , sort([3,2,4,1])
  end
  def test_empty_array
    assert_equal [] , sort([])
  end
  def test_nil
    assert_equal nil , sort(nil)
  end
end




If you are running from the terminal, it should look something like this, if
it completes correctly. If it does not, it will tell you which test failed,
and show you what it expected to get, and what it actually got.

$ ruby selection_sort.rb
Loaded suite selection_sort
Started
.....
Finished in 0.000673 seconds.

5 tests, 5 assertions, 0 failures, 0 errors




And for the record, I also don't think it makes sense to start writing tests
before you know how to write code. Though I would agree that it should be
taught earlier than it is (at my school, it isn't taught at all).

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