Lampo-Rspec-Expect-Change.rb

    context "when a valid form is submitted" do
      before do
        3.times do |s|
          FactoryGirl.create(:specialty, urn: "urn-num-#{s}")
        end
      end
      it "adds specialties to an organization" do
        visit edit_organization_path(organization)

        specialty_first  = Specialty.first
        specialty_last   = Specialty.last
        check("organization_specialty_ids_#{specialty_first.id}")
        check("organization_specialty_ids_#{specialty_last.id}")

        expect { 
          click_button "Update Organization"
        }.to change{organization.reload.specialties.size}.by(2)

      end
      it "removes specialties from an organization" do
        organization.specialty_ids = [Specialty.first.id, Specialty.last.id]

        visit edit_organization_path(organization)
        uncheck("organization_specialty_ids_#{Specialty.first.id}")
        uncheck("organization_specialty_ids_#{Specialty.last.id}")

        expect { 
          click_button "Update Organization"
        }.to change{organization.reload.specialties.size}.by(-2)

      end
    end