test: cover null resource envelopes for account pages (#70) (#71) (#78)

src/pages/account-operations/ui/AccountOperationsPage/AccountOperationsPage.test.tsx

@@ -492,6 +492,20 @@ describe("AccountOperationsPage", () => {
 			}),
 		).toBeInTheDocument();
 	});
+
+	it("keeps a null operations envelope loading instead of a confirmed empty period", async () => {
+		configureTestAuth();
+		server.use(
+			http.get("*/api/v1/brokerage-accounts/:accountId/operations", () =>
+				HttpResponse.json(resource(null)),
+			),
+		);
+		renderPage();
+		expect(
+			await screen.findByRole("status", { name: "Загрузка" }, { timeout: 4000 }),
+		).toBeVisible();
+		expect(screen.queryByText("Операций нет")).not.toBeInTheDocument();
+	});
 });
 
 it("keeps UTC operation boundaries in GET and source sync requests", async () => {