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require 'spec_helper'
describe Immutable::List do
describe '#tails' do
it 'is lazy' do
-> { Immutable.stream { fail }.tails }.should_not raise_error
end
[
[[], []],
[['A'], [L['A']]],
[%w[A B C], [L['A', 'B', 'C'], L['B', 'C'], L['C']]],
].each do |values, expected|
context "on #{values.inspect}" do
let(:list) { L[*values] }
it 'preserves the original' do
list.tails
list.should eql(L[*values])
end
it "returns #{expected.inspect}" do
list.tails.should eql(L[*expected])
end
end
end
end
end
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