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require 'spec_helper'
describe Immutable::List do
context 'without a comparator' do
context 'on an empty list' do
it 'returns an empty list' do
L.empty.merge_by.should be_empty
end
end
context 'on a single list' do
let(:list) { L[1, 2, 3] }
it 'returns the list' do
L[list].merge_by.should eql(list)
end
end
context 'with multiple lists' do
subject { L[L[3, 6, 7, 8], L[1, 2, 4, 5, 9]] }
it 'merges the lists based on natural sort order' do
subject.merge_by.should == L[1, 2, 3, 4, 5, 6, 7, 8, 9]
end
end
end
context 'with a comparator' do
context 'on an empty list' do
it 'returns an empty list' do
L.empty.merge_by { |item| fail('should never be called') }.should be_empty
end
end
context 'on a single list' do
let(:list) { L[1, 2, 3] }
it 'returns the list' do
L[list].merge_by(&:-@).should == L[1, 2, 3]
end
end
context 'with multiple lists' do
subject { L[L[8, 7, 6, 3], L[9, 5, 4, 2, 1]] }
it 'merges the lists based on the specified transformer' do
subject.merge_by(&:-@).should == L[9, 8, 7, 6, 5, 4, 3, 2, 1]
end
end
end
end
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