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require 'spec_helper'
describe Immutable::Vector do
let(:vector) { V[*values] }
describe '#last' do
let(:last) { vector.last }
shared_examples 'checking values' do
it 'returns the last item' do
expect(last).to eq(last_item)
end
end
context 'with an empty vector' do
let(:last_item) { nil }
let(:values) { [] }
include_examples 'checking values'
end
context 'with a single item vector' do
let(:last_item) { 'A' }
let(:values) { %w[A] }
include_examples 'checking values'
end
context 'with a multi-item vector' do
let(:last_item) { 'B' }
let(:values) { %w[A B] }
include_examples 'checking values'
end
[31, 32, 33, 1023, 1024, 1025].each do |size|
context "with a #{size}-item vector" do
let(:last_item) { size }
let(:values) { (1..size).to_a }
include_examples 'checking values'
end
end
end
end
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