code: def test_invalid_scheme(self):
      failed = False
      try:
          validate("invalid_schema", {"name": "foobar"})
      except ValidationSchemaMissing as e:
          failed = True
      assert failed
  
file_path: datmo/datmo/core/util/tests/test_validation.py
imports: from __future__ import division
  from __future__ import print_function
  from __future__ import unicode_literals
  from datmo.core.util.validation import validate
  from datmo.core.util.exceptions import ValidationFailed, ValidationSchemaMissing
label_desc: Use image node_id 3 for calling the TestJSONStore obj's underlying member method code with example usage: obj.test_invalid_scheme() without return types