Schema check does not work

[satyrius]

I want to check the schema (not validate data by schema)
https://python-jsonschema.readthedocs.org/en/latest/validate/#jsonschema.IValidator.check_schema

But it does not work for me, there is no ValidationErrors

from jsonschema.validators import Draft4Validator

schema = {'foo': 'bar'}
validator = Draft4Validator(schema)
validator.check_schema(schema)

[Julian]

Hi.

Please do not file issues saying that fundamental functionality "does not work". jsonschema is a well tested library. It's not free from bugs certainly -- it is software written by a human(s) -- but I encourage you to give it a bit more credit.

Now, for your actual issue, what is leading you to believe that that schema is invalid? It's a perfectly valid schema. Unknown validators are legal and allowed in JSON Schema, and they basically are ignored by validators that do not know what they're for. Consult the JSON Schema specification for details.

[tuukkamustonen]

@satyrius You can try providing a custom schema (http://json-schema.org/schema) that has "additionalProperties": true:

v = Draft4Validator(SCHEMA)
for error in v.iter_errors(schema_to_validate):
    ...

Then it should throw error in case of an unexpected key.