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require 'spec_helper'
describe Immutable::Set do
describe '#all?' do
context 'when empty' do
it 'with a block returns true' do
S.empty.all? {}.should == true
end
it 'with no block returns true' do
S.empty.all?.should == true
end
end
context 'when not empty' do
context 'with a block' do
let(:set) { S['A', 'B', 'C'] }
it 'returns true if the block always returns true' do
set.all? { |item| true }.should == true
end
it 'returns false if the block ever returns false' do
set.all? { |item| item == 'D' }.should == false
end
it 'propagates an exception from the block' do
-> { set.all? { |k,v| raise 'help' } }.should raise_error(RuntimeError)
end
it 'stops iterating as soon as the block returns false' do
yielded = []
set.all? { |k,v| yielded << k; false }
yielded.size.should == 1
end
end
describe 'with no block' do
it 'returns true if all values are truthy' do
S[true, 'A'].all?.should == true
end
[nil, false].each do |value|
it "returns false if any value is #{value.inspect}" do
S[value, true, 'A'].all?.should == false
end
end
end
end
end
end
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