Using grunt-tv4, I'm trying to validate my schema files. One of them is topicName.json:

{
  "$schema": "http://json-schema.org/draft-04/schema#",
  "id": "http://host.com/schema/topicName",

  "type": "string",
  "minLength": 1
}

Running it with the options

      options: {
        root: grunt.file.readJSON("json-v4.json"),
        banUnknownProperties: true
      },

Produces no errors, it is a valid schema. (json-v4.json is the meta schema from json-schema.org)

But, if I also enable multi: true, then the following error is reported:

fail: src/lib/schema/topicName.json !== http://json-schema.org/draft-04/schema#
   invalid type: string (expected array)
      /type
      -> value: string -> "string"
      -> schema: array -> /properties/type/anyOf/1/type

As it turns out, validateAnyOf() does not properly handle a true this.trackUnknownProperties.

Note that type: "string" is invalid, type: ["string"] is valid. This is because the loop in ValidatorContext.validateAnyOf() only properly resets the this.error array when the last checked subSchema was valid. In the given case, the last subSchema (checking an array) fails, and the errors are kept in the this.errors array, bleeding through.

validateAnyOf() should report all errors of all subSchemas only if all of them failed during validateMultiple().