exercism.io Rna Transcription

complement.rb

class Complement

  def self.of_dna(dna)
    dna.chars.map { |char| transpositions[char] }.join
  end

  def self.of_rna(rna)
    rna.chars.map { |char| transpositions.invert[char] }.join
  end

  private

  def self.transpositions
    { CYTOSINE => GUANINE, GUANINE => CYTOSINE, THYMINE => ADENINE, ADENINE => URACIL }
  end

  CYTOSINE = 'C'
  GUANINE  = 'G'
  ADENINE  = 'A'
  THYMINE  = 'T'
  URACIL   = 'U'

end

complement_test.rb

require 'minitest/autorun'
require_relative 'complement'

class ComplementTest < MiniTest::Unit::TestCase
  def test_rna_complement_of_cytosine_is_guanine
    assert_equal 'G', Complement.of_dna('C')
  end

  def test_rna_complement_of_guanine_is_cytosine
    skip
    assert_equal 'C', Complement.of_dna('G')
  end

  def test_rna_complement_of_thymine_is_adenine
    skip
    assert_equal 'A', Complement.of_dna('T')
  end

  def test_rna_complement_of_adenine_is_uracil
    skip
    assert_equal 'U', Complement.of_dna('A')
  end

  def test_rna_complement
    skip
    assert_equal 'UGCACCAGAAUU', Complement.of_dna('ACGTGGTCTTAA')
  end

  def test_dna_complement_of_cytosine_is_guanine
    skip
    assert_equal 'G', Complement.of_rna('C')
  end

  def test_dna_complement_of_guanine_is_cytosine
    skip
    assert_equal 'C', Complement.of_rna('G')
  end

  def test_dna_complement_of_uracil_is_adenine
    skip
    assert_equal 'A', Complement.of_rna('U')
  end

  def test_dna_complement_of_adenine_is_thymine
    skip
    assert_equal 'T', Complement.of_rna('A')
  end

  def test_dna_complement
    skip
    assert_equal 'ACTTGGGCTGTAC', Complement.of_rna('UGAACCCGACAUG')
  end
end