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require 'spec_helper'
describe Immutable::Set do
[:map, :collect].each do |method|
describe "##{method}" do
context 'when empty' do
it 'returns self' do
S.empty.send(method) {}.should equal(S.empty)
end
end
context 'when not empty' do
let(:set) { S['A', 'B', 'C'] }
context 'with a block' do
it 'preserves the original values' do
set.send(method, &:downcase)
set.should eql(S['A', 'B', 'C'])
end
it 'returns a new set with the mapped values' do
set.send(method, &:downcase).should eql(S['a', 'b', 'c'])
end
end
context 'with no block' do
it 'returns an Enumerator' do
set.send(method).class.should be(Enumerator)
set.send(method).each(&:downcase).should == S['a', 'b', 'c']
end
end
end
context 'from a subclass' do
it 'returns an instance of the subclass' do
subclass = Class.new(Immutable::Set)
instance = subclass['a', 'b']
instance.map(&:upcase).class.should be(subclass)
end
end
context 'when multiple items map to the same value' do
it 'filters out the duplicates' do
set = S.new('aa'..'zz')
result = set.map { |s| s[0] }
result.should eql(Immutable::Set.new('a'..'z'))
result.size.should == 26
end
end
it 'works on large sets' do
set = S.new(1..1000)
result = set.map { |x| x * 10 }
result.size.should == 1000
1.upto(1000) { |n| result.include?(n * 10).should == true }
end
end
end
end
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