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require 'spec_helper'
describe Immutable::Set do
let(:original) { S['A', 'B', 'C'] }
[:add, :<<].each do |method|
describe "##{method}" do
context 'with a unique value' do
let(:result) { original.send(method, 'D') }
it 'preserves the original' do
result
original.should eql(S['A', 'B', 'C'])
end
it 'returns a copy with the superset of values' do
result.should eql(S['A', 'B', 'C', 'D'])
end
end
context 'with a duplicate value' do
let(:result) { original.send(method, 'C') }
it 'preserves the original values' do
result
original.should eql(S['A', 'B', 'C'])
end
it 'returns self' do
result.should equal(original)
end
end
it 'can add nil to a set' do
original.add(nil).should eql(S['A', 'B', 'C', nil])
end
it 'works on large sets, with many combinations of input' do
50.times do
# Array#sample is buggy on RBX 2.5.8; that's why #uniq is needed here
# See https://github.com/rubinius/rubinius/issues/3506
array = (1..500).to_a.sample(100).uniq
set = S.new(array)
to_add = 1000 + rand(1000)
set.add(to_add).size.should == array.size + 1
set.add(to_add).include?(to_add).should == true
end
end
end
end
describe '#add?' do
context 'with a unique value' do
let(:result) { original.add?('D') }
it 'preserves the original' do
original.should eql(S['A', 'B', 'C'])
end
it 'returns a copy with the superset of values' do
result.should eql(S['A', 'B', 'C', 'D'])
end
end
context 'with a duplicate value' do
let(:result) { original.add?('C') }
it 'preserves the original values' do
original.should eql(S['A', 'B', 'C'])
end
it 'returns false' do
result.should equal(false)
end
end
end
end
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