add public usdt contract ws test

test/contract/ws.public.usdt.test.ts

@@ -0,0 +1,74 @@
+import {
+  WebsocketClient,
+  WSClientConfigurableOptions,
+  WS_KEY_MAP,
+} from '../../src';
+import {
+  logAllEvents,
+  getSilentLogger,
+  waitForSocketEvent,
+  WS_OPEN_EVENT_PARTIAL,
+} from '../ws.util';
+
+describe('Public Contract USDT Websocket Client', () => {
+  let wsClient: WebsocketClient;
+
+  const wsClientOptions: WSClientConfigurableOptions = {
+    market: 'contractUSDT',
+  };
+
+  beforeAll(() => {
+    wsClient = new WebsocketClient(
+      wsClientOptions,
+      getSilentLogger('expectSuccessNoAuth')
+    );
+    wsClient.connectPublic();
+  });
+
+  afterAll(() => {
+    wsClient.closeAll(true);
+  });
+
+  it('should open a public ws connection', async () => {
+    const wsOpenPromise = waitForSocketEvent(wsClient, 'open');
+    try {
+      expect(await wsOpenPromise).toMatchObject({
+        event: WS_OPEN_EVENT_PARTIAL,
+        wsKey: WS_KEY_MAP.contractUSDTPublic,
+      });
+    } catch (e) {
+      console.error('open: ', e);
+      expect(e).toBeFalsy();
+    }
+  });
+
+  it('should subscribe to public orderbook events', async () => {
+    const wsResponsePromise = waitForSocketEvent(wsClient, 'response');
+    const wsUpdatePromise = waitForSocketEvent(wsClient, 'update');
+
+    const wsTopic = 'orderbook.25.BTCUSDT';
+    wsClient.subscribe(wsTopic);
+
+    try {
+      expect(await wsResponsePromise).toMatchObject({
+        success: true,
+        op: 'subscribe',
+      });
+    } catch (e) {
+      console.error('response: ', e);
+      // sub failed (or jest expect threw)
+      expect(e).toBeFalsy();
+    }
+
+    try {
+      expect(await wsUpdatePromise).toMatchObject({
+        topic: wsTopic,
+        data: {
+          a: expect.any(Array),
+        },
+      });
+    } catch (e) {
+      console.error(`Wait for "${wsTopic}" event exception: `, e);
+    }
+  });
+});