##### SUMMARY

Add integration tests for the varnames lookup plugin.

##### ISSUE TYPE

Feature Idea

##### COMPONENT NAME

varnames lookup plugin

from __future__ import (absolute_import, division, print_function)
__metaclass__ = type
DOCUMENTATION = """
    lookup: varnames
    author: Ansible Core
    version_added: "2.8"
    short_description: Lookup matching variable names
    description:
      - Retrieves a list of matching Ansible variable names.
    options:
      _terms: