Contents

require_relative '../../../test_helper'

module Troo
  describe Sentence do
    let(:described_class) { Sentence }
    let(:elements)        { ['Hydrogen'] }
    let(:label)           { 'elements' }

    describe '#initialize' do
      subject { described_class.new(elements, label) }

      it 'assigns the elements to an instance variable' do
        subject.instance_variable_get('@elements').must_equal(elements)
      end

      it 'assigns the label to an instance variable' do
        subject.instance_variable_get('@label').must_equal(label)
      end
    end

    describe '.construct' do
      subject { described_class.construct(elements, label) }

      context 'when there is one element' do
        let(:elements) { ['Hydrogen'] }

        it 'returns the element as a string' do
          subject.must_equal('Hydrogen')
        end
      end

      context 'when there are two elements' do
        let(:elements) { %w(Hydrogen Helium) }

        it "returns the elements joined with 'and'" do
          subject.must_equal('Hydrogen and Helium')
        end
      end

      context 'when there are more than two elements' do
        let(:elements) { %w(Hydrogen Helium Lithium) }

        it 'returns the elements as a sentence list' do
          subject.must_equal('Hydrogen, Helium and Lithium')
        end
      end

      context 'when there are no elements' do
        let(:elements) { [] }

        it 'returns a polite message' do
          subject.must_equal('No elements have been assigned.')
        end
      end
    end
  end
end

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
troo-0.0.8	test/lib/troo/presentation/sentence_test.rb