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require 'spec_helper'
describe Immutable::Set do
[:select, :find_all].each do |method|
describe "##{method}" do
let(:set) { S['A', 'B', 'C'] }
context 'when everything matches' do
it 'returns self' do
set.send(method) { |item| true }.should equal(set)
end
end
context 'when only some things match' do
context 'with a block' do
let(:result) { set.send(method) { |item| item == 'A' }}
it 'preserves the original' do
result
set.should eql(S['A', 'B', 'C'])
end
it 'returns a set with the matching values' do
result.should eql(S['A'])
end
end
context 'with no block' do
it 'returns an Enumerator' do
set.send(method).class.should be(Enumerator)
set.send(method).each { |item| item == 'A' }.should eql(S['A'])
end
end
end
context 'when nothing matches' do
let(:result) { set.send(method) { |item| false }}
it 'preserves the original' do
result
set.should eql(S['A', 'B', 'C'])
end
it 'returns the canonical empty set' do
result.should equal(Immutable::EmptySet)
end
end
context 'from a subclass' do
it 'returns an instance of the same class' do
subclass = Class.new(Immutable::Set)
instance = subclass.new(['A', 'B', 'C'])
instance.send(method) { true }.class.should be(subclass)
instance.send(method) { false }.class.should be(subclass)
instance.send(method) { rand(2) == 0 }.class.should be(subclass)
end
end
it 'works on a large set, with many combinations of input' do
items = (1..1000).to_a
original = S.new(items)
30.times do
threshold = rand(1000)
result = original.send(method) { |item| item <= threshold }
result.size.should == threshold
result.each { |item| item.should <= threshold }
(threshold+1).upto(1000) { |item| result.include?(item).should == false }
end
original.should eql(S.new(items))
end
end
end
end
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