#!/usr/bin/env ruby

require 'minitest/autorun'
begin
  require_relative 'hamming'
rescue LoadError => e
  puts "\n\n#{e.backtrace.first} #{e.message}"
  puts DATA.read
  exit 1
end

class HammingTest < MiniTest::Unit::TestCase
  def test_no_difference_between_identical_strands
    assert_equal 0, Hamming.compute('A', 'A')
  end

  def test_complete_hamming_distance_of_for_single_nucleotide_strand
    assert_equal 1, Hamming.compute('A', 'G')
  end

  def test_complete_hamming_distance_of_for_small_strand
    assert_equal 2, Hamming.compute('AG', 'CT')
  end

  def test_small_hamming_distance
    assert_equal 1, Hamming.compute('AT', 'CT')
  end

  def test_small_hamming_distance_in_longer_strand
    assert_equal 1, Hamming.compute('GGACG', 'GGTCG')
  end

  def test_nonunique_characters_within_first_strand
    assert_equal 1, Hamming.compute('AGA', 'AGG')
  end

  def test_nonunique_characters_within_second_strand
    assert_equal 1, Hamming.compute('AGG', 'AGA')
  end

  def test_large_hamming_distance
    assert_equal 4, Hamming.compute('GATACA', 'GCATAA')
  end

  def test_hamming_distance_in_very_long_strand
    assert_equal 9, Hamming.compute('GGACGGATTCTG', 'AGGACGGATTCT')
  end
end

__END__

*****************************************************
You got an error, which is exactly as it should be.
This is the first step in the Test-Driven Development
(TDD) process.

The most important part of the error is

      cannot load such file

It's looking for a file named hamming.rb that doesn't
exist yet.

To fix the error, create an empty file named hamming.rb
in the same directory as the hamming_test.rb file.

Then run the test again.

For more guidance as you work on this exercise, see
GETTING_STARTED.md.
*****************************************************