receive-n.yaml

doc: |
  An example of an new feature that supports (conditional) phase
  branching.
  
  In this example, we use the new 'branch' step.  The value of a
  'branch' is Javascript code that should return the (name) of the
  next phase or the empty string (to continue with the current phase).
labels:
  - selftest
spec:
  phases:
    phase1:
      steps:
        - '$include<include/mock.yaml>'
        - ingest:
            payload: '{"sending":2}'
        - ingest:
            payload: '{"want":"chips"}'
        - ingest:
            payload: '{"want":"kale"}'
        - ingest:
            payload: '{"want":"queso"}'
        - ingest:
            payload: '{"want":"margarita"}'
        - goto: listen-for-n
    listen-for-n:
      steps:
        - recv:
            pattern: '{"sending":"?n"}'
        - run: |
            test.State.sending = test.Bindings["?n"];
        - goto: listen-for-msgs
    listen-for-msgs:
      steps:
        - recv:
            pattern: '{"want":"?*y"}'
            doc: |
              We only count certain messages.
            guard: |
              return "kale" != bs["?*y"];
            timeout: 1s
        - branch: |
            // Decrement our counter, and return the next phase.
            test.State.sending--;
            return 0 == test.State.sending ? "done" : "listen-for-msgs";