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require 'spec_helper'
describe Immutable::SortedSet do
describe '#values_at' do
let(:sorted_set) { SS['a', 'b', 'c'] }
it 'accepts any number of indices, and returns a sorted_set of items at those indices' do
sorted_set.values_at(0).should eql(SS['a'])
sorted_set.values_at(1,2).should eql(SS['b', 'c'])
end
context 'when passed invalid indices' do
it 'filters them out' do
sorted_set.values_at(1,2,3).should eql(SS['b', 'c'])
sorted_set.values_at(-10,10).should eql(SS.empty)
end
end
context 'when passed no arguments' do
it 'returns an empty sorted_set' do
sorted_set.values_at.should eql(SS.empty)
end
end
context 'from a subclass' do
it 'returns an instance of the subclass' do
subclass = Class.new(Immutable::SortedSet)
instance = subclass.new([1,2,3])
instance.values_at(1,2).class.should be(subclass)
end
end
end
end
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