require 'spec_helper'

describe Immutable::Hash do
  [:find, :detect].each do |method|
    describe "##{method}" do
      [
        [[], 'A', nil],
        [[], nil, nil],
        [['A' => 'aye'], 'A', ['A', 'aye']],
        [['A' => 'aye'], 'B', nil],
        [['A' => 'aye'], nil, nil],
        [['A' => 'aye', 'B' => 'bee', nil => 'NIL'], 'A', ['A', 'aye']],
        [['A' => 'aye', 'B' => 'bee', nil => 'NIL'], 'B', ['B', 'bee']],
        [['A' => 'aye', 'B' => 'bee', nil => 'NIL'], nil, [nil, 'NIL']],
        [['A' => 'aye', 'B' => 'bee', nil => 'NIL'], 'C', nil],
      ].each do |values, key, expected|
        describe "on #{values.inspect}" do
          let(:hash) { H[*values] }

          describe 'with a block' do
            it "returns #{expected.inspect}" do
              hash.send(method) { |k, v| k == key }.should == expected
            end
          end

          describe 'without a block' do
            it 'returns an Enumerator' do
              result = hash.send(method)
              result.class.should be(Enumerator)
              result.each { |k,v| k == key }.should == expected
            end
          end
        end
      end

      it 'stops iterating when the block returns true' do
        yielded = []
        H[a: 1, b: 2].find { |k,v| yielded << k; true }
        yielded.size.should == 1
      end
    end
  end
end