What is it?

    module ReadMe
      require "calificador"

      # Define class to test
      class HighTea
        attr_accessor :scones, :posh

        def initialize(scones:)
          raise ArgumentError, "Cannot have a negative amount of scones" if scones.negative?

          @scones = scones
        end

        def eat_scone
          raise "Out of scones" if scones.zero?

          @scones -= 1
        end

        def tea
          @posh ? "Darjeeling First Flush" : "Earl Grey"
        end
      end

      # Unit test
      class HighTeaTest < Calificador::Test
        examines HighTea

        # Define a factory for the test subject
        factory HighTea do
          # Set properties on the created object
          posh { false }

          # Define transient properties that will not be set automatically
          transient do
            # Constructor arguments are automatically set from properties
            scones { 2 }
          end

          # Use traits to define variants of your test subject
          trait :style do
            posh { true }
          end
        end

        # Test class methods
        type do
          operation :new do
            must "set a default amount of scones" do
              # Write assertions using plain Ruby methods instead of spec DSL methods
              assert { subject.scones } > 0
            end

            must "provide an instance that has tea" do
              refute { subject.tea }.nil?
            end
          end
        end

        # Get nice test names. This one will be called "HighTea must let me have a scone"
        must "let me have a scone" do
          count = subject.scones
          subject.eat_scone
          assert { subject.scones } == count - 1
        end

        # Modify test subject using traits or properties for minor variations
        must "complain if out of scones", props { scones { 0 } } do
          assert { subject.eat_scone }.raises?(StandardError)
        end

        # Create subcontexts for variations of the test subject using traits and properties
        with :style do
          # Still nice test names. This one is "HighTea with style must have expensive tea"
          must "have expensive tea" do
            assert { subject.tea }.include?("First Flush")
          end
        end
      end
    end

    ReadMe::HighTeaTest.run_all_tests