Undefined but required properties do not fail the validation

Description

The validation does not check whether a required property is actually part of the definition:
A message like Schema properties specified as 'required' must be defined is not created for the validation

Swagger-codegen version

2.2.2

Swagger declaration file content or url

In below the version is required but not a property:

  Sample:
    required:
      - name
      - version
    properties:
      name:
        type: string

Command line used for generation

Steps to reproduce

Related issues

Suggest a Fix

Start by reproducing the Swagger Parser 2.2.2 validation behavior with the Sample definition: version is listed under required but absent from properties. Trace the schema validation entry point and add coverage for the expected message that required properties must be defined; done means this invalid declaration produces that validation error.