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require 'spec_helper'
describe Immutable::Deque do
describe '#clear' do
[
[],
['A'],
%w[A B C],
].each do |values|
context "on #{values}" do
let(:deque) { D[*values] }
it 'preserves the original' do
deque.clear
deque.should eql(D[*values])
end
it 'returns an empty deque' do
deque.clear.should equal(D.empty)
end
end
end
end
context 'from a subclass' do
it 'returns an instance of the subclass' do
subclass = Class.new(Immutable::Deque)
instance = subclass.new([1,2])
instance.clear.should be_empty
instance.clear.class.should be(subclass)
end
end
end
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