Surreal
^^^^^
**Definition:**

* A test whose use of test doubles is so confusing, it's hard to tell what the test is even doing at run-time.


**Code Example:**

.. code-block:: ruby

  # Subject under test
  def weigh_clothes(clothes)
    clothes.map { |item| item.weight }.reduce(:+).round
  end

  # Test
  class Surreal < SmellTest
    def setup
      stub(FACTORS, :size, 9, ["S"])
      super
    end

    def test_adds_weights
      small_wet_sock = Clothing.new("S", "sock", "wet")
      large_dry_jacket = Clothing.new("L", "jacket", "dry")
      stub(large_dry_jacket, :weight, 8)
      xl_soaked_pants = OpenStruct.new(weight: 15)

      result = weigh_clothes([small_wet_sock, large_dry_jacket, xl_soaked_pants])

      assert_equal 26, result
    end
  end

  # Fake production implementations to simplify example test of subject
  class Clothing
    def initialize(size, type, wetness)
      @size = size
      @type = type
      @wetness = wetness
    end

    def weight
      return 1 *
        FACTORS.size(@size) *
        FACTORS.type(@type) *
        FACTORS.wetness(@wetness)
    end
  end

  class Factors
    def size(size)
      case size
      when "S" then 0.75
      when "M" then 1
      when "L" then 1.25
      when "XL" then 1.5
      else 1
      end
    end

    def type(type)
      case type
      when "sock" then 0.2
      when "shirt" then 1
      when "pants" then 2
      when "jacket" then 3
      else 1
      end
    end

    def wetness(wetness)
      case wetness
      when "dry" then 1
      when "moist" then 1.1
      when "wet" then 1.6
      when "soaked" then 2.5
      else 1
      end
    end
  end
  FACTORS = Factors.new

**References:**

.. admonition:: Quality attributes

    * :octicon:`file-code;1em` -  Code Example
    * :octicon:`comment-discussion;1em` -  Cause and Effect
    * :octicon:`graph;1em` -  Frequency
    * :octicon:`sync;1em` -  Refactoring

* `A workbook repository of example test smells and what to do about them <https://github.com/testdouble/test-smells>`_ :octicon:`file-code;1em` :octicon:`comment-discussion;1em` :octicon:`sync;1em`