issue 974: the serving controller follows its own plan-moved, so a plan moved from the terminal is looked at

cmd/mesh-controller/plan_looks_test.go

@@ -9,6 +9,7 @@ import (
 
 	"github.com/novox/mesh-controller/internal/broker"
 	"github.com/novox/mesh-controller/internal/inventory"
+	"github.com/novox/mesh-controller/internal/link"
 	"github.com/novox/mesh-controller/internal/testbus"
 )
 
@@ -315,3 +316,36 @@ func TestKeysThatCannotBeReadAreWatchedByTimersAndTheLookFails(t *testing.T) {
 		t.Error("no timer of its own watches the wait")
 	}
 }
+
+// A plan moved by a process the serving controller did not spawn — a verb run at the control node's terminal — is
+// looked at: the controller follows its own plan-moved (issue 974, round 1).
+func TestAPlanMovedByAnotherProcessAsksForALook(t *testing.T) {
+	js, err := broker.Dial(testbus.URL(t))
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(js.Close)
+	if err := broker.AssertMeshStreams(js); err != nil {
+		t.Fatal(err)
+	}
+	var failures, looks atomic.Int32
+	l := lookerCounting(&failures, &looks, nil)
+	lookerMu.Lock()
+	theLooker = l
+	lookerMu.Unlock()
+	t.Cleanup(func() { lookerMu.Lock(); theLooker = nil; lookerMu.Unlock() })
+	ctx, stop := context.WithCancel(context.Background())
+	defer stop()
+	go l.run(ctx)
+	if err := startPlanMovedLooks(ctx, js); err != nil {
+		t.Fatal(err)
+	}
+	legacy, err := js.Conn().JetStream()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if _, err := legacy.Publish(link.SeatEventSubject(link.MeshControllerSeat, link.KeyPlanMoved), []byte(`{}`)); err != nil {
+		t.Fatal(err)
+	}
+	eventually(t, "a look on the plan moved", func() bool { return looks.Load() >= 1 })
+}