Contents

# encoding: utf-8

require 'spec_helper'

describe Optimizer, '.chain' do
  let(:operation)       { double('Operation')  }
  let(:object)          { Optimizer            }
  let(:identity)        { object::Identity     }
  let(:optimizer_class) { Class.new(Optimizer) }

  context 'with no optimizers' do
    subject { object.chain }

    it { should be(identity) }

    it 'returns a block that returns the operation' do
      expect(subject.call(operation)).to be(operation)
    end
  end

  context 'with an optimizer that can optimize the operation' do
    subject { object.chain(optimizer_class) }

    let(:optimized) { double('Optimized') }

    before do
      optimized = self.optimized
      optimizer_class.send(:define_method, :optimizable?) { true      }
      optimizer_class.send(:define_method, :optimize)     { optimized }
    end

    it { should_not be(identity) }

    it { should be_kind_of(Proc) }

    it 'returns a block that optimizes the operation' do
      expect(subject.call(operation)).to be(optimized)
    end
  end

  context 'with an optimizer that cannot optimize the operation' do
    subject { object.chain(optimizer_class) }

    before do
      optimizer_class.send(:define_method, :optimizable?) { false }
    end

    it { should_not be(identity) }

    it { should be_kind_of(Proc) }

    it 'returns a block that calls the successor (Identity) with the operation' do
      expect(subject.call(operation)).to be(operation)
    end
  end
end

Version data entries

2 entries across 2 versions & 1 rubygems

Version	Path
axiom-optimizer-0.2.0	spec/unit/axiom/optimizer/class_methods/chain_spec.rb
axiom-optimizer-0.1.1	spec/unit/axiom/optimizer/class_methods/chain_spec.rb