#218 Returning a promise when subscribing to topics

test/v5/public.ws.test.ts

@@ -0,0 +1,27 @@
+import { WebsocketClient } from '../../src';
+
+describe('Public V5 Websocket client', () => {
+  const api = new WebsocketClient({
+    market: 'v5',
+  });
+
+  const linearSymbol = 'BTCUSDT';
+  const linearCategory = 'linear';
+
+  describe('Topics subscription confirmation', () => {
+    it('can subscribeV5 to LINEAR with valid topic', async () => {
+      await expect(
+        api.subscribeV5(`publicTrade.${linearSymbol}`, linearCategory),
+      ).resolves.toBeUndefined();
+    });
+
+    it('cannot subscribeV5 to LINEAR with valid topic', async () => {
+      try {
+        await api.subscribeV5(`publicTrade.${linearSymbol}X`, linearCategory);
+      } catch (e) {
+        expect(e).toBeDefined();
+        expect(e).toMatch('(publicTrade.BTCUSDTX) failed to subscribe');
+      }
+    });
+  });
+});