pasta spec examples

basic_pasta_spec.rb

describe Pasta do
  describe "#sauce_name" do
    describe "when initialized with sauce_type = 2" do
      let(:pasta) { Pasta.new(2) }

      it "returns \"pesto\"" do
        assert_equal(pasta.sauce_name, "pesto")
      end
    end
  end
end

iterative_pasta_test.rb

describe Pasta do
  describe "#sauce_name" do
    test_cases = [
      [1, "marinara"],
      [2, "pesto"],
      [3, "alfredo"]
    ]

    test_cases.each do |(sauce_type, expected_sauce_name)|
      describe "when initialized with sauce_type = #{sauce_type}" do
        let(:pasta) { Pasta.new(sauce_type) }

        it "returns #{expected_sauce_name.inspect}" do
          assert_equal(pasta.sauce_name, expected_sauce_name)
        end
      end
    end
  end
end

pasta.rb

class Pasta
  SAUCE_TYPE_MAP = {
    1 => "marinara",
    2 => "pesto",
    3 => "alfredo"
  }

  attr_reader :sauce_name

  def initialize(sauce_type)
    @sauce_name = get_sauce_name_from_type(sauce_type)
  end

  private

  def get_sauce_name_from_type(sauce_type)
    SAUCE_TYPE_MAP[sauce_type]
  end
end