After making a testing config you can generate auth tests for your endpoints in just a couple steps.

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Specifying Entities

The first step is to specify the entities for your endpoint’s datafields: entity_select

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Making your Test

After you specify your entities you can generate a test using the VALIDATE_AUTH_RULES template. You can do this in the UI on the testing tab for your endpoint: validate_auth_rules Or you can generate a test using the Metlo CLI: 
metlo test generate -t VALIDATE_AUTH_RULES -e <your-endpoint-uuid>