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require 'spec_helper'
describe Immutable::Vector do
let(:vector) { V[*values] }
describe '#<<' do
let(:ltlt) { vector << added_value }
shared_examples 'checking adding values' do
let(:added_vector) { V[*added_values] }
it 'preserves the original' do
original = vector
vector << added_value
expect(original).to eq(vector)
end
it 'ltlts the item to the vector' do
expect(ltlt).to eq(added_vector)
end
end
context 'with a empty array adding a single item' do
let(:values) { [] }
let(:added_value) { 'A' }
let(:added_values) { ['A'] }
include_examples 'checking adding values'
end
context 'with a single-item array adding a different item' do
let(:values) { ['A'] }
let(:added_value) { 'B' }
let(:added_values) { %w[A B] }
include_examples 'checking adding values'
end
context 'with a single-item array adding a duplicate item' do
let(:values) { ['A'] }
let(:added_value) { 'A' }
let(:added_values) { %w[A A] }
include_examples 'checking adding values'
end
[31, 32, 33, 1023, 1024, 1025].each do |size|
context "with a #{size}-item vector adding a different item" do
let(:values) { (1..size).to_a }
let(:added_value) { size+1 }
let(:added_values) { (1..(size+1)).to_a }
include_examples 'checking adding values'
end
end
context 'from a subclass' do
it 'returns an instance of the subclass' do
subclass = Class.new(Immutable::Vector)
instance = subclass[1,2,3]
(instance << 4).class.should be(subclass)
end
end
end
end
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