decomposer_spec.rb

describe Decomposer do

  it 'should instantiate itself and its components properly' do
    fsm    = mock 'FSM'
    archs  = Set[mock('Arch', :pins => 5), mock('Arch', :pins => 4)] # FIXME unmock
    uv_gen = mock 'UVGenerator class'
    qu_gen = mock 'QuGenerator class'
    qv_gen = mock 'QvGenerator class'
    uv_gen.should_receive(:new).with fsm, archs
    qu_gen.should_receive(:new).with fsm, archs
    qv_gen.should_receive(:new).with fsm, archs
    decomposer = Decomposer.new :fsm => fsm, :archs => archs, :uv_gen => uv_gen, :qu_gen => qu_gen, :qv_gen => qv_gen
  end

  context 'given that the three generators are working properly' do

    it 'should poll the generators and yield the resulting decompositions one by one' do
      fsm    = mock 'FSM'
      archs  = Set[mock('Arch', :pins => 5), mock('Arch', :pins => 4)] # FIXME unmock
      uv     = mock 'UVGenerator'
      qu     = mock 'QuGenerator'
      qv     = mock 'QvGenerator'
      uv_gen = mock 'UVGenerator class', :new => uv
      qu_gen = mock 'QuGenerator class', :new => qu
      qv_gen = mock 'QvGenerator class', :new => qv

      u_a, v_a = [0,1], [2]
      u_b, v_b = [0], [1,2]
      uv.should_receive(:each).with(no_args).and_yield(u_a, v_a).and_yield(u_b, v_b)

      qu_a1 = mock('Blanket')
      qu_a2 = mock('Blanket')
      qu.should_receive(:each).with(u_a, v_a).and_yield(qu_a1).and_yield(qu_a2)

      qu_b = mock('Blanket')
      qu.should_receive(:each).with(u_b, v_b).and_yield(qu_b)

      g_a1, qv_a1 = mock('Blanket'), mock('Blanket')
      qv.should_receive(:each).with(u_a, v_a, qu_a1).and_yield(g_a1, qv_a1)

      g_a2, qv_a2 = mock('Blanket'), mock('Blanket')
      qv.should_receive(:each).with(u_a, v_a, qu_a2).and_yield(g_a2, qv_a2)

      g_bA, qv_bA = mock('Blanket'), mock('Blanket')
      g_bB, qv_bB = mock('Blanket'), mock('Blanket')
      qv.should_receive(:each).with(u_b, v_b, qu_b).and_yield(g_bA, qv_bA).and_yield(g_bB, qv_bB)

      decomposer = Decomposer.new :fsm => fsm, :archs => archs, :uv_gen => uv_gen, :qu_gen => qu_gen, :qv_gen => qv_gen
      results = []
      decomposer.each { |dec| results << dec }
      results.size.should  == 4
      results.first.should == Decomposition.new(fsm, u_a, v_a, qu_a1, g_a1, qv_a1)
      results.last.should  == Decomposition.new(fsm, u_b, v_b, qu_b,  g_bB, qv_bB)
    end

  end

end