mesh-sdk/go/catalogue/runonce_test.go

package catalogue

import (
	"strings"
	"testing"
)

// A run-once container is a step the host runs to completion (novox/hq ADR 0052). The control
// plane's part is small and exact: carry the field to the host unchanged, keep the step ahead of
// the container it gates in author order, and refuse a malformed run-once near its cause rather
// than on the machine. These tests defend that.

func TestARunOnceStepMayNameWhatItReads(t *testing.T) {
	// For a step, restart-on means *run again* when what it reads changed: a gate that fetches a
	// provider's root names the binding file it reads, so a provider that moved is fetched again
	// (novox/hq ADR 0099). Accepted here, and the host's digest does the rest.
	digest := "@sha256:" + strings.Repeat("a", 64)
	good := []byte(`{"module":"m","resources":[
	  {"id":"conf","type":"file","path":"/x","content":"y"},
	  {"id":"seed","type":"container","name":"seed","image":"registry.example/x` + digest + `","run-once":true,"restart-on":["conf"]}
	]}`)
	if _, err := decodeForTest(good); err != nil {
		t.Errorf("a run-once step naming what it reads was refused: %v", err)
	}
}