How to manually test BPMN processes based on the camunda engine?

Hello!
I am interested in how the QA-team MANUALLY tests web services in which Camunda BPMN is implemented. What tools are used? How are case studies written based on models? How is test coverage provided for all scenarios? Maybe the question does not apply to the Camunda platform, but I will be very grateful for the answer in this topic or email (annagorbushina70@gmail.com)