require 'spec_helper'

describe 'Veritas::Optimizer::Relation::Operation::Limit::ZeroLimit#optimize' do
  subject { object.optimize }

  let(:klass)    { Optimizer::Relation::Operation::Limit::ZeroLimit }
  let(:header)   { Relation::Header.new([ [ :id, Integer ] ])       }
  let(:order)    { Relation.new(header, [ [ 1 ] ].each).order       }
  let(:relation) { order.take(0)                                    }
  let(:object)   { klass.new(relation)                              }

  before do
    object.operation.should be_kind_of(Relation::Operation::Limit)
  end

  it { should be_kind_of(Relation::Empty) }

  its(:header) { should equal(header) }
end