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require 'spec_helper'
describe Immutable::Set do
describe '.new' do
it 'initializes a new set' do
set = S.new([1,2,3])
set.size.should be(3)
[1,2,3].each { |n| set.include?(n).should == true }
end
it 'accepts a Range' do
set = S.new(1..3)
set.size.should be(3)
[1,2,3].each { |n| set.include?(n).should == true }
end
it "returns a Set which doesn't change even if the initializer is mutated" do
array = [1,2,3]
set = S.new([1,2,3])
array.push('BAD')
set.should eql(S[1,2,3])
end
context 'from a subclass' do
it 'returns a frozen instance of the subclass' do
subclass = Class.new(Immutable::Set)
instance = subclass.new(['some', 'values'])
instance.class.should be subclass
instance.should be_frozen
end
end
it 'is amenable to overriding of #initialize' do
class SnazzySet < Immutable::Set
def initialize
super(['SNAZZY!!!'])
end
end
set = SnazzySet.new
set.size.should be(1)
set.include?('SNAZZY!!!').should == true
end
end
describe '[]' do
it 'accepts any number of arguments and initializes a new set' do
set = S[1,2,3,4]
set.size.should be(4)
[1,2,3,4].each { |n| set.include?(n).should == true }
end
end
end
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