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require 'spec_helper'
describe Immutable::List do
[:append, :concat, :+].each do |method|
describe "##{method}" do
it 'is lazy' do
-> { Immutable.stream { fail }.append(Immutable.stream { fail }) }.should_not raise_error
end
[
[[], [], []],
[['A'], [], ['A']],
[[], ['A'], ['A']],
[%w[A B], %w[C D], %w[A B C D]],
].each do |left_values, right_values, expected|
context "on #{left_values.inspect} and #{right_values.inspect}" do
let(:left) { L[*left_values] }
let(:right) { L[*right_values] }
let(:result) { left.append(right) }
it 'preserves the left' do
result
left.should eql(L[*left_values])
end
it 'preserves the right' do
result
right.should eql(L[*right_values])
end
it "returns #{expected.inspect}" do
result.should eql(L[*expected])
end
end
end
end
end
end
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