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Feature: Step - fold()

  Scenario: g_V_fold
    Given the modern graph
    And the traversal of
      """
      g.V().fold()
      """
    When iterated next
    Then the result should be unordered
      | result |
      | v[marko] |
      | v[vadas] |
      | v[lop] |
      | v[josh] |
      | v[ripple] |
      | v[peter]  |

  Scenario: g_V_fold_unfold
    Given the modern graph
    And the traversal of
      """
      g.V().fold().unfold()
      """
    When iterated to list
    Then the result should be unordered
      | result |
      | v[marko] |
      | v[vadas] |
      | v[lop] |
      | v[josh] |
      | v[ripple] |
      | v[peter]  |

  Scenario: g_V_age_foldX0_plusX
    Given the modern graph
    And the traversal of
      """
      g.V().values("age").fold(0, Operator.sum)
      """
    When iterated to list
    Then the result should be unordered
      | result |
      | d[123].i |