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require 'spec_helper'
describe Immutable::List do
[:map, :collect].each do |method|
describe "##{method}" do
it 'is lazy' do
-> { Immutable.stream { fail }.map { |item| item } }.should_not raise_error
end
[
[[], []],
[['A'], ['a']],
[%w[A B C], %w[a b c]],
].each do |values, expected|
context "on #{values.inspect}" do
let(:list) { L[*values] }
context 'with a block' do
it 'preserves the original' do
list.send(method, &:downcase)
list.should eql(L[*values])
end
it "returns #{expected.inspect}" do
list.send(method, &:downcase).should eql(L[*expected])
end
it 'is lazy' do
count = 0
list.send(method) { |item| count += 1 }
count.should <= 1
end
end
context 'without a block' do
it 'returns an Enumerator' do
list.send(method).class.should be(Enumerator)
list.send(method).each(&:downcase).should eql(L[*expected])
end
end
end
end
end
end
end
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