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require 'spec_helper'
describe Immutable::Set do
describe '#clear' do
[
[],
['A'],
%w[A B C],
].each do |values|
describe "on #{values}" do
let(:set) { S[*values] }
it 'preserves the original' do
set.clear
set.should eql(S[*values])
end
it 'returns an empty set' do
set.clear.should equal(S.empty)
end
end
end
context 'from a subclass' do
it 'returns an empty instance of the subclass' do
subclass = Class.new(Immutable::Set)
instance = subclass.new([:a, :b, :c, :d])
instance.clear.class.should be(subclass)
instance.clear.should be_empty
end
end
end
end
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