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require 'spec_helper'
describe Immutable::Deque do
[:enqueue, :push].each do |method|
describe "##{method}" do
[
[[], 'A', ['A']],
[['A'], 'B', %w[A B]],
[['A'], 'A', %w[A A]],
[%w[A B C], 'D', %w[A B C D]],
].each do |values, new_value, expected|
describe "on #{values.inspect} with #{new_value.inspect}" do
let(:deque) { D[*values] }
it 'preserves the original' do
deque.send(method, new_value)
deque.should eql(D[*values])
end
it "returns #{expected.inspect}" do
deque.send(method, new_value).should eql(D[*expected])
end
end
end
end
end
end
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