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require 'spec_helper'
describe Immutable::Vector do
describe '#partition' do
[
[[], [], []],
[[1], [1], []],
[[1, 2], [1], [2]],
[[1, 2, 3], [1, 3], [2]],
[[1, 2, 3, 4], [1, 3], [2, 4]],
[[2, 3, 4], [3], [2, 4]],
[[3, 4], [3], [4]],
[[4], [], [4]],
].each do |values, expected_matches, expected_remainder|
describe "on #{values.inspect}" do
let(:vector) { V[*values] }
describe 'with a block' do
let(:result) { vector.partition(&:odd?) }
let(:matches) { result.first }
let(:remainder) { result.last }
it 'preserves the original' do
result
vector.should eql(V[*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 matches' do
matches.should eql(V[*expected_matches])
end
it 'correctly identifies the remainder' do
remainder.should eql(V[*expected_remainder])
end
end
describe 'without a block' do
it 'returns an Enumerator' do
vector.partition.class.should be(Enumerator)
vector.partition.each(&:odd?).should eql([V.new(expected_matches), V.new(expected_remainder)])
end
end
end
end
end
end
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