describe Celsius::Transformation::Step do
  context "when initialized with a transformation" do
    let(:transformation) do
      Class.new(Celsius::Transformation) do
        def some_transformation_method
          true
        end
      end.new
    end

    let(:step) do
      described_class.new(transformation)
    end

    describe "#transformation" do
      it "allows access to the transformation" do
        expect(step.transformation).to be(transformation)
      end
    end

    context "if a unknown method is called" do
      context "if the transformation has a matching method" do
        it "calls the method on the transformation" do
          expect(step).to respond_to(:some_transformation_method)
          expect(step.some_transformation_method).to eq(transformation.some_transformation_method)
        end
      end

      context "if the transformation has no matching method" do
        it "raises an error" do
          expect { step.some_unknown_method }.to raise_error
        end
      end
    end
  end
end