If Event Processes are modeled as Microservices performing a unit of business operation, then the entry point for a flow can be defined. A Feeder component (comprising the appropriate XSD and a sample XML message) can be placed at the entry point to test (sanity) the execution task for the required flow. This Feeder component can be removed afterwards.
To test scenarios on which the execution of a component depends upon the content of the input received, a route interceptor can be placed and values changed on-the-fly to check the validity of each execution.
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