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require 'spec_helper'
describe Immutable::Set do
[:exclusion, :^].each do |method|
describe "##{method}" do
[
[[], [], []],
[['A'], [], ['A']],
[['A'], ['A'], []],
[%w[A B C], ['B'], %w[A C]],
[%w[A B C], %w[B C D], %w[A D]],
[%w[A B C], %w[D E F], %w[A B C D E F]],
].each do |a, b, expected|
context "for #{a.inspect} and #{b.inspect}" do
let(:set_a) { S[*a] }
let(:set_b) { S[*b] }
let(:result) { set_a.send(method, set_b) }
it "doesn't modify the original Sets" do
result
set_a.should eql(S.new(a))
set_b.should eql(S.new(b))
end
it "returns #{expected.inspect}" do
result.should eql(S[*expected])
end
end
context 'when passed a Ruby Array' do
it 'returns the expected Set' do
S[*a].exclusion(b.freeze).should eql(S[*expected])
end
end
end
it 'works for a wide variety of inputs' do
50.times do
array1 = (1..400).to_a.sample(100)
array2 = (1..400).to_a.sample(100)
result = S.new(array1) ^ S.new(array2)
result.to_a.sort.should eql(((array1 | array2) - (array1 & array2)).sort)
end
end
end
end
end
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