Ruby Weekly Challenge - DNA Sequences

dna_sequence.rb

def check_dna(sequence1, sequence2)
  complementary?(normalize(sequence1), normalize(sequence2.reverse))
end

def complementary?(seq1, seq2)
  return bonded?(seq1, seq2) || bonded?(seq2, seq1)
end

def bonded?(seq1, seq2)
  seq2.include?(seq1)
end

def normalize(seq)
  seq.gsub(/A|T/i, '0').gsub(/C|G/i, '1')
end

dna_sequence_spec.rb

require_relative '../dna_sequence'

describe "dna_sequence" do
  context "when there is a sequence mismatch" do
    it "returns false" do
      expect(check_dna('GTCTTAGTGTAGCTATGCATGC', 'GCATGCATAGCTACACTACGAC')).to be_falsey
    end
  end

  context "when one strand is completely bonded by the other" do
    it "returns true" do
      expect(check_dna('GCGCTGCTAGCTGATCGA', 'ACGTACGATCGATCAGCTAGCAGCGCTAC')).to be_truthy
    end
  end

  context "when both strands are only partially bonded" do
    it "returns false" do
      expect(check_dna('CGATACGAACCCATAATCG', 'CTACACCGGCCGATTATGG')).to be_falsey
    end
  end
end