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require 'spec_helper'
describe Immutable::List do
describe '#none?' do
context 'on a really big list' do
it "doesn't run out of stack" do
-> { BigList.none? { false } }.should_not raise_error
end
end
context 'when empty' do
it 'with a block returns true' do
L.empty.none? {}.should == true
end
it 'with no block returns true' do
L.empty.none?.should == true
end
end
context 'when not empty' do
context 'with a block' do
let(:list) { L['A', 'B', 'C', nil] }
['A', 'B', 'C', nil].each do |value|
it "returns false if the block ever returns true (#{value.inspect})" do
list.none? { |item| item == value }.should == false
end
end
it 'returns true if the block always returns false' do
list.none? { |item| item == 'D' }.should == true
end
end
context 'with no block' do
it 'returns false if any value is truthy' do
L[nil, false, true, 'A'].none?.should == false
end
it 'returns true if all values are falsey' do
L[nil, false].none?.should == true
end
end
end
end
end
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