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require 'spec_helper'
describe Immutable::Set do
[:intersection, :&].each do |method|
describe "##{method}" do
[
[[], [], []],
[['A'], [], []],
[['A'], ['A'], ['A']],
[%w[A B C], ['B'], ['B']],
[%w[A B C], %w[A C], %w[A C]],
].each do |a, b, expected|
context "for #{a.inspect} and #{b.inspect}" do
let(:set_a) { S[*a] }
let(:set_b) { S[*b] }
it "returns #{expected.inspect}, without changing the original Sets" do
set_a.send(method, set_b).should eql(S[*expected])
set_a.should eql(S.new(a))
set_b.should eql(S.new(b))
end
end
context "for #{b.inspect} and #{a.inspect}" do
let(:set_a) { S[*a] }
let(:set_b) { S[*b] }
it "returns #{expected.inspect}, without changing the original Sets" do
set_b.send(method, set_a).should eql(S[*expected])
set_a.should eql(S.new(a))
set_b.should eql(S.new(b))
end
end
context 'when passed a Ruby Array' do
it 'returns the expected Set' do
S[*a].send(method, b.freeze).should eql(S[*expected])
end
end
end
it 'returns results consistent with Array#&' do
50.times do
array1 = rand(100).times.map { rand(1000000).to_s(16) }
array2 = rand(100).times.map { rand(1000000).to_s(16) }
result = S.new(array1).send(method, S.new(array2))
result.to_a.sort.should eql((array1 & array2).sort)
end
end
end
end
end
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