k.M01.source-code.ListComprehension.feature Maven / Gradle / Ivy

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# Copyright 2016 "Neo Technology",
# Network Engine for Objects in Lund AB (http://neotechnology.com)
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Feature: ListComprehension

  Scenario: Returning a list comprehension
    Given an empty graph
    And having executed:
      """
      CREATE (a:A)
      CREATE (a)-[:T]->(:B),
             (a)-[:T]->(:C)
      """
    When executing query:
      """
      MATCH p = (n)-->()
      RETURN [x IN collect(p) | head(nodes(x))] AS p
      """
    Then the result should be:
      | p            |
      | [(:A), (:A)] |
    And no side effects

  Scenario: Using a list comprehension in a WITH
    Given an empty graph
    And having executed:
      """
      CREATE (a:A)
      CREATE (a)-[:T]->(:B),
             (a)-[:T]->(:C)
      """
    When executing query:
      """
      MATCH p = (n:A)-->()
      WITH [x IN collect(p) | head(nodes(x))] AS p, count(n) AS c
      RETURN p, c
      """
    Then the result should be:
      | p            | c |
      | [(:A), (:A)] | 2 |
    And no side effects

  Scenario: Using a list comprehension in a WHERE
    Given an empty graph
    And having executed:
      """
      CREATE (a:A {prop: 'c'})
      CREATE (a)-[:T]->(:B),
             (a)-[:T]->(:C)
      """
    When executing query:
      """
      MATCH (n)-->(b)
      WHERE n.prop IN [x IN labels(b) | lower(x)]
      RETURN b
      """
    Then the result should be:
      | b    |
      | (:C) |
    And no side effects