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require 'spec_helper'
describe Immutable::Set do
describe '#first' do
context 'on an empty set' do
it 'returns nil' do
S.empty.first.should be_nil
end
end
context 'on a non-empty set' do
it 'returns an arbitrary value from the set' do
%w[A B C].include?(S['A', 'B', 'C'].first).should == true
end
end
it 'returns nil if only member of set is nil' do
S[nil].first.should be(nil)
end
it 'returns the first item yielded by #each' do
10.times do
set = S.new((rand(10)+1).times.collect { rand(10000 )})
set.each { |item| break item }.should be(set.first)
end
end
end
end
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