Paranoid
^^^^^
**Definition:**

* A test (and as a result, its subject) covers edge cases that aren't actually reachable by the production application.


**Code Example:**

.. code-block:: ruby

  # Subject under test
  require "json"

  # [Note: In production, this func will only ever be called by .csv_for below]
  def escape_csv_string_value(value)
    if !value
      ""
    elsif !value.kind_of?(String)
      escape_csv_string_value(JSON.dump(value))
    elsif value.include?(",")
      "\"#{value.gsub(/"/, "\"\"")}\""
    else
      value
    end
  end

  # Test
  class Paranoid < SmellTest
    def test_does_nothing_without_commas
      text = "hi my name is \"Todd\""

      result = escape_csv_string_value(text)

      assert_equal text, result
    end

    def test_wraps_comma_strings_with_double_quotes
      result = escape_csv_string_value("Hello, world.")

      assert_equal "\"Hello, world.\"", result
    end

    def test_double_quotes_in_comma_strings
      result = escape_csv_string_value("Hello, \"Todd\".")

      assert_equal "\"Hello, \"\"Todd\"\".\"", result
    end

    def test_ensure_not_null
      result = escape_csv_string_value(nil)

      assert_equal "", result
    end

    def test_coerce_number_to_string
      result = escape_csv_string_value(42)

      assert_equal "42", result
    end

    def test_coerce_object_to_string_and_escape_the_string
      result = escape_csv_string_value(name: "Jim", age: 64)

      assert_equal "\"{\"\"name\"\":\"\"Jim\"\",\"\"age\"\":64}\"", result
    end
  end

  # Fake production implementation to add context to the subject
  def csv_for(value)
    if value.kind_of?(String)
      escape_csv_string_value(value)
    elsif value.kind_of?(Array)
      if value.any? { |item| item.kind_of?(Array) }
        value.map { |item| csv_for(item) }.join("\n")
      else
        value.map { |item| csv_for(item) }.join(",")
      end
    else
      value
    end
  end

  # Example use:
  csv_for([["id", "name", "bio"], [1, "joe", "why, hello \"joe\"!"]])
  # => 'id,name,bio\n1,joe,"why, hello ""joe""!"'

**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`