# encoding: utf-8

require 'spec_helper'

describe Tuple, '#==' do
  subject { object == other }

  let(:header) { Relation::Header.coerce([[:id, Integer]]) }
  let(:data)   { [1]                                       }
  let(:object) { described_class.new(header, data)         }

  context 'with the same object' do
    let(:other) { object }

    it { should be(true) }

    it 'is symmetric' do
      should eql(other == object)
    end
  end

  context 'with an equivalent object' do
    let(:other) { object.dup }

    it { should be(true) }

    it 'is symmetric' do
      should eql(other == object)
    end
  end

  context 'with an equivalent object of a subclass' do
    let(:other) { Class.new(described_class).new(header, data) }

    it { should be(true) }

    it 'is not symmetric' do
      should_not eql(other == object)
    end
  end

  context 'with an object having a different header' do
    let(:other_header) { Relation::Header.coerce([[:id, Numeric]])     }
    let(:other_data)   { data                                          }
    let(:other)        { described_class.new(other_header, other_data) }

    it { should be(false) }

    it 'is symmetric' do
      should eql(other == object)
    end
  end

  context 'with an object having different data' do
    let(:other_header) { header                                        }
    let(:other_data)   { [2]                                           }
    let(:other)        { described_class.new(other_header, other_data) }

    it { should be(false) }

    it 'is symmetric' do
      should eql(other == object)
    end
  end

  context 'with an equivalent object responding to #to_ary' do
    let(:other) { data }

    it { should be(true) }

    it 'is symmetric' do
      should eql(other == object)
    end
  end

  context 'with a different object responding to #to_ary' do
    let(:other) { [2] }

    it { should be(false) }

    it 'is symmetric' do
      should eql(other == object)
    end
  end
end