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require 'spec_helper'
describe Immutable::Hash do
describe '#any?' do
context 'when empty' do
it 'with a block returns false' do
H.empty.any? {}.should == false
end
it 'with no block returns false' do
H.empty.any?.should == false
end
end
context 'when not empty' do
let(:hash) { H['A' => 'aye', 'B' => 'bee', 'C' => 'see', nil => 'NIL'] }
context 'with a block' do
[
%w[A aye],
%w[B bee],
%w[C see],
[nil, 'NIL'],
].each do |pair|
it "returns true if the block ever returns true (#{pair.inspect})" do
hash.any? { |key, value| key == pair.first && value == pair.last }.should == true
end
it 'returns false if the block always returns false' do
hash.any? { |key, value| key == 'D' && value == 'dee' }.should == false
end
end
it 'propagates exceptions raised in the block' do
-> { hash.any? { |k,v| raise 'help' } }.should raise_error(RuntimeError)
end
it 'stops iterating as soon as the block returns true' do
yielded = []
hash.any? { |k,v| yielded << k; true }
yielded.size.should == 1
end
end
context 'with no block' do
it 'returns true' do
hash.any?.should == true
end
end
end
end
end
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