code: def test_lazyness(self):
      schema = schemas.LazySchema("oas-2.0.json")
      assert schema._schema is None
  
      "" in schema  # Trigger load
      assert schema._schema is not None
      assert isinstance(schema._schema, dict)
  
file_path: flask-restplus/tests/test_schemas.py
imports: from __future__ import unicode_literals, absolute_import
  import pytest
  from jsonschema import ValidationError
  from flask_restplus import errors, schemas
label_desc: Use image node_id 1 for calling the SchemasTest obj's underlying member method code with example usage: obj.test_lazyness() without return types