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require 'spec_helper'
describe Immutable::List do
describe '#tail' do
context 'on a really big list' do
it "doesn't run out of stack" do
-> { BigList.select(&:nil?).tail }.should_not raise_error
end
end
[
[[], []],
[['A'], []],
[%w[A B C], %w[B C]],
].each do |values, expected|
context "on #{values.inspect}" do
let(:list) { L[*values] }
it 'preserves the original' do
list.tail
list.should eql(L[*values])
end
it "returns #{expected.inspect}" do
list.tail.should eql(L[*expected])
end
end
end
end
end
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