CoreProcessing processes the main core.

InjectEgressHeaders simulates the infrastructure output layer where your FaaS will be deployed.

InjectIngressHeaders simulates the infrastructure input layer where your FaaS will be deployed.

ServeHandler is the entry point for offline testing.

SubProcessing simulates speicifc go workflow that can happens in the FaaS environment.

WithPort can be used to select a port to run the test server, if no port given the server will use an available port given by system and print it to stdout.

Server represent the local server with it's parameters.

Option type used for option pattern to add parameters to local server.