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require 'spec_helper'
describe Immutable::Deque do
describe '#pop' do
[
[[], []],
[['A'], []],
[%w[A B C], %w[A B]],
].each do |values, expected|
context "on #{values.inspect}" do
let(:deque) { D[*values] }
it 'preserves the original' do
deque.pop
deque.should eql(D[*values])
end
it "returns #{expected.inspect}" do
deque.pop.should eql(D[*expected])
end
it 'returns a frozen instance' do
deque.pop.should be_frozen
end
end
end
context 'on empty subclass' do
let(:subclass) { Class.new(Immutable::Deque) }
let(:empty_instance) { subclass.new }
it 'returns an empty object of the same class' do
empty_instance.pop.class.should be subclass
end
end
end
end
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