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require 'spec_helper'
describe Immutable::List do
[:union, :|].each do |method|
describe "##{method}" do
it 'is lazy' do
-> { Immutable.stream { fail }.union(Immutable.stream { fail }) }.should_not raise_error
end
[
[[], [], []],
[['A'], [], ['A']],
[%w[A B C], [], %w[A B C]],
[%w[A A], ['A'], ['A']],
].each do |a, b, expected|
context "returns #{expected.inspect}" do
let(:list_a) { L[*a] }
let(:list_b) { L[*b] }
it "for #{a.inspect} and #{b.inspect}" do
list_a.send(method, list_b).should eql(L[*expected])
end
it "for #{b.inspect} and #{a.inspect}" do
list_b.send(method, list_a).should eql(L[*expected])
end
end
end
end
end
end
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