tests: add resp3 check test (#1)

Author: nkaradzhov

packages/client/lib/tests/test-scenario/negative-tests.e2e.ts

@@ -0,0 +1,15 @@
+import assert from "assert";
+import { createClient } from "../../..";
+
+describe("Negative tests", () => {
+  it("should only be enabled with RESP3", () => {
+    assert.throws(
+      () =>
+        createClient({
+          RESP: 2,
+          maintPushNotifications: "enabled",
+        }),
+      "Error: Graceful Maintenance is only supported with RESP3",
+    );
+  });
+});