painting_controller_spec_1.rb

require 'spec_helper'

describe PaintingsController do
  let!(:painting) { build_stubbed(:painting) }

  before do
    Painting.stub(:new).and_return(painting)
  end

  describe "POST 'create'" do
    subject { get 'create' }
    context "when the painting is valid" do
      before { painting.stub(:save).and_return(true) }
      it { should render_template('contract') }
    end
  end
end

painting_controller_spec_2.rb

require 'spec_helper'

describe PaintingsController do
  let!(:painting) { build_stubbed(:painting) }

  before do
    Painting.stub(:new).and_return(painting)
    painting.stub(:save).and_return(true)
  end

  describe "POST 'create'" do
    subject { get 'create' }
    context "when the painting is valid" do
      it { should render_template('contract') }
    end
  end
end

trace

     Failure/Error: before { painting.stub(:valid?).and_return(true) }
     NameError:
       undefined local variable or method ` painting' for #<RSpec::Core::ExampleGroup::Nested_1::Nested_1::Nested_1:0x007fb7acbe5cb0>
     # ./spec/controllers/painting_controller_spec.rb:10:in `block (4 levels) in <top (required)>'