Learn to use MS Postman test suite
"Once you’ve built your SCIM endpoint, you’ll want to test it to ensure that your endpoint is compliant with the SCIM RFC. We've provided a set of Postman tests that you can run to verify CRUD operations on users / groups, filtering on users / groups, updating group memberships , and disabling / soft deleting users. Check out SCIM Tests."
https://github.com/AzureAD/SCIMReferenceCode/wiki/Test-Your-SCIM-Endpoint
Edited by Asko Soukka