yaml-schema 0.9.0

A YAML schema validator
Documentation 
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Feature: References ($ref)

  Scenario: Simple $ref to $defs
    Given a YAML schema:
      ```
      $defs:
        name:
          type: string
      type: object
      properties:
        name:
          $ref: "#/$defs/name"
      ```
    Then it should accept:
      ```
      name: "Alice"
      ```
    But it should NOT accept:
      ```
      name: 42
      ```

  Scenario: Direct circular $ref
    Given a YAML schema:
      ```
      $defs:
        a:
          $ref: "#/$defs/a"
      $ref: "#/$defs/a"
      ```
    Then it should NOT accept:
      ```
      anything
      ```
    And the error message should be "[1:1] .: Circular $ref detected: #/$defs/a"

  Scenario: Indirect circular $ref
    Given a YAML schema:
      ```
      $defs:
        a:
          $ref: "#/$defs/b"
        b:
          $ref: "#/$defs/a"
      $ref: "#/$defs/a"
      ```
    Then it should NOT accept:
      ```
      anything
      ```
    And the error message should be "[1:1] .: Circular $ref detected: #/$defs/a"