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require 'spec_helper'
describe Immutable::Set do
describe '#none?' do
context 'when empty' do
it 'with a block returns true' do
S.empty.none? {}.should == true
end
it 'with no block returns true' do
S.empty.none?.should == true
end
end
context 'when not empty' do
context 'with a block' do
let(:set) { S['A', 'B', 'C', nil] }
['A', 'B', 'C', nil].each do |value|
it "returns false if the block ever returns true (#{value.inspect})" do
set.none? { |item| item == value }.should == false
end
end
it 'returns true if the block always returns false' do
set.none? { |item| item == 'D' }.should == true
end
it 'stops iterating as soon as the block returns true' do
yielded = []
set.none? { |item| yielded << item; true }
yielded.size.should == 1
end
end
context 'with no block' do
it 'returns false if any value is truthy' do
S[nil, false, true, 'A'].none?.should == false
end
it 'returns true if all values are falsey' do
S[nil, false].none?.should == true
end
end
end
end
end
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