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require 'spec_helper'
describe Immutable::List do
describe '#break' do
it 'is lazy' do
-> { Immutable.stream { fail }.break { |item| false } }.should_not raise_error
end
[
[[], [], []],
[[1], [1], []],
[[1, 2], [1, 2], []],
[[1, 2, 3], [1, 2], [3]],
[[1, 2, 3, 4], [1, 2], [3, 4]],
[[2, 3, 4], [2], [3, 4]],
[[3, 4], [], [3, 4]],
[[4], [], [4]],
].each do |values, expected_prefix, expected_remainder|
context "on #{values.inspect}" do
let(:list) { L[*values] }
context 'with a block' do
let(:result) { list.break { |item| item > 2 }}
let(:prefix) { result.first }
let(:remainder) { result.last }
it 'preserves the original' do
result
list.should eql(L[*values])
end
it 'returns a frozen array with two items' do
result.class.should be(Array)
result.should be_frozen
result.size.should be(2)
end
it 'correctly identifies the prefix' do
prefix.should eql(L[*expected_prefix])
end
it 'correctly identifies the remainder' do
remainder.should eql(L[*expected_remainder])
end
end
context 'without a block' do
let(:result) { list.break }
let(:prefix) { result.first }
let(:remainder) { result.last }
it 'returns a frozen array with two items' do
result.class.should be(Array)
result.should be_frozen
result.size.should be(2)
end
it 'returns self as the prefix' do
prefix.should equal(list)
end
it 'leaves the remainder empty' do
remainder.should be_empty
end
end
end
end
end
end
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