Derive the late holder's worker from a build seat, since the build agent's seat is gone (issue 1931)

cmd/mesh-controller/busobjects_test.go

@@ -46,25 +46,31 @@ func aCarriedConsumer(t *testing.T, open *stores) broker.Consumer {
 	return broker.Consumer{}
 }
 
-// aLateHolder is a module holding the build agent's seat on anchor, assigned after the controller
-// started, and the worker its seat's queue should have for it.
+// aLateHolder is a module holding a build seat (node-build-go) on anchor, assigned after the controller started, and
+// the worker its seat's queue should have for it: a build seat is pulled by kind, so the worker is the one for the
+// seat's first accepted kind (the build agent's seat, which had one worker for all, is gone with the builder).
 func aLateHolder(t *testing.T, open *stores) broker.Consumer {
 	t.Helper()
 	register(t, open, catalogue.Manifest{Module: "late-builder", Version: "1",
-		Claims: []catalogue.Claim{{Name: "node-build-agent", Scope: catalogue.ScopeNode}}})
+		Claims: []catalogue.Claim{{Name: "node-build-go", Scope: catalogue.ScopeNode}}})
 	if _, err := open.inventory.Assign(t.Context(), "anchor", "late-builder"); err != nil {
 		t.Fatal(err)
 	}
+	_, workers, err := seatTrafficObjects(t.Context(), open.inventory)
+	if err != nil {
+		t.Fatal(err)
+	}
 	for _, s := range inventory.MeshSeats() {
-		if s.Name == "node-build-agent" {
-			c, needed := broker.HolderConsumerFor("anchor", "late-builder", s)
-			if !needed {
-				t.Fatal("the build agent's seat needs no worker")
+		if s.Name != "node-build-go" || len(s.Accepts) == 0 {
+			continue
+		}
+		for _, w := range workers {
+			if w.Name == broker.WorkerName(s.Name, s.Accepts[0]) {
+				return w
 			}
-			return c
 		}
 	}
-	t.Fatal("the mesh declares no build agent's seat")
+	t.Fatal("the build seat's holder is derived no worker")
 	return broker.Consumer{}
 }