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require 'spec_helper'
describe Immutable::List do
describe '#subsequences' do
let(:list) { L[1,2,3,4,5] }
it 'yields all sublists with 1 or more consecutive items' do
result = []
list.subsequences { |l| result << l }
result.size.should == (5 + 4 + 3 + 2 + 1)
result.sort.should == [[1], [1,2], [1,2,3], [1,2,3,4], [1,2,3,4,5],
[2], [2,3], [2,3,4], [2,3,4,5], [3], [3,4], [3,4,5], [4], [4,5], [5]]
end
context 'with no block' do
it 'returns an Enumerator' do
list.subsequences.class.should be(Enumerator)
list.subsequences.to_a.sort.should == [[1], [1,2], [1,2,3], [1,2,3,4], [1,2,3,4,5],
[2], [2,3], [2,3,4], [2,3,4,5], [3], [3,4], [3,4,5], [4], [4,5], [5]]
end
end
end
end
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