Recover worker leases after empty event replay

cmd/orchestra-worker/main_test.go

@@ -83,6 +83,29 @@ func TestWorkerHydratesLeaseMissingTaskCache(t *testing.T) {
 	}
 }
 
+func TestWorkerReconcilesLeaseAfterEmptyEventReplay(t *testing.T) {
+	s := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		switch r.URL.Path {
+		case "/v1/federation/events":
+			_, _ = w.Write([]byte(`{"cursor":42,"events":[]}`))
+		case "/v1/tasks":
+			_, _ = w.Write([]byte(`[{"id":"t","source":"s","external_id":"x","project":"p","state":"leased","lease":{"harness_id":"h"}}]`))
+		case "/v1/federation/events/ack":
+			w.WriteHeader(http.StatusNoContent)
+		default:
+			t.Fatalf("unexpected %s", r.URL.Path)
+		}
+	}))
+	defer s.Close()
+	w := &worker{api: federation.Client{BaseURL: s.URL, WorkerID: "h", Token: "t"}, harnessID: "h", cursor: 42, tasks: map[string]domain.Task{}, sessions: map[string]herdr.Session{"t": {}}, leases: map[string]lease{}, statePath: t.TempDir() + "/state.json", hard: .75}
+	if err := w.once(context.Background()); err != nil {
+		t.Fatal(err)
+	}
+	if _, ok := w.leases["t"]; !ok {
+		t.Fatal("empty event replay did not recover current lease")
+	}
+}
+
 func TestWorkerStartsRouterIssuedLeaseInLocalGitWorktree(t *testing.T) {
 	remote := filepath.Join(t.TempDir(), "remote.git")
 	if out, err := exec.Command("git", "init", "--bare", remote).CombinedOutput(); err != nil {