Contents

require 'spec_helper'

describe 'Veritas::Optimizer::Logic::Predicate::Comparable::NeverEquivalent#optimizable?' do
  subject { object.optimizable? }

  let(:klass)     { Class.new(Optimizer::Logic::Predicate)      }
  let(:attribute) { Attribute::Integer.new(:id, :size => 1..10) }
  let(:predicate) { Logic::Predicate::Equality.new(left, right) }
  let(:object)    { klass.new(predicate)                        }

  before do
    klass.class_eval { include Optimizer::Logic::Predicate::Comparable::NeverEquivalent }

    predicate.should be_kind_of(Logic::Predicate::Comparable)
  end

  context 'when left is a constant and is valid' do
    let(:left)  { 1         }
    let(:right) { attribute }

    it { should be(false) }
  end

  context 'when left is a constand and is not valid' do
    let(:left)  { 0         }
    let(:right) { attribute }

    it { should be(true) }
  end

  context 'when right is a constant and is valid' do
    let(:left)  { attribute }
    let(:right) { 1         }

    it { should be(false) }
  end

  context 'when right is a constant and is not valid' do
    let(:left)  { attribute }
    let(:right) { 0         }

    it { should be(true) }
  end

  context 'when left and right are joinable' do
    let(:left)  { attribute }
    let(:right) { attribute }

    it { should be(false) }
  end

  context 'when left and right are not joinable' do
    let(:left)  { attribute                                    }
    let(:right) { Attribute::Integer.new(:id, :size => -10..0) }

    it { should be(true) }
  end
end

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
veritas-0.0.2	spec/unit/veritas/optimizer/logic/predicate/comparable/never_equivalent/optimizable_spec.rb