Number words letter counter

letters_counter_spec.rb

class LettersCounter
  def count word
    word.gsub(/\s|-/, '').length
  end

  def sum_from_list words
    lengths = words.map { |word| count word }
    lengths.inject(:+)
  end
end


require 'minitest/autorun'
require 'linguistics'

describe LettersCounter do
  before do
    @it = LettersCounter.new
  end

  describe 'count' do
    it 'can count the number of letters in a word' do
      @it.count('one').must_equal 3
    end

    it 'should not count spaces or hyphens' do
      @it.count('three hundred and forty-two').must_equal 23
      @it.count('one hundred and fifteen').must_equal 20
    end
  end

  describe 'sum_from_list' do
    before do
      Linguistics::use :en
    end

    it 'can calculate the sum of letters used' do
      words = ['three hundred and forty-two', 'one hundred and fifteen']
      @it.sum_from_list(words).must_equal 43
    end

    it 'can calculate the sum of letters from 1 to 5' do
      words = (1..5).map { |number| number.en.numwords }
      @it.sum_from_list(words).must_equal 19
    end

    it 'can calculate the sum of letters from 1 to 1000' do
      words = (1..1000).map { |number| number.en.numwords }
      @it.sum_from_list(words).must_equal 21124 
    end
  end
end