fix(test): fix a timing issue in pubsub test (#3498)

Signed-off-by: Xiaolong Chen <[email protected]>

Author: cxljs

pubsub_test.go

@@ -113,6 +113,9 @@ var _ = Describe("PubSub", func() {
 		pubsub := client.SSubscribe(ctx, "mychannel", "mychannel2")
 		defer pubsub.Close()
 
+		// Let Redis process the ssubscribe command.
+		time.Sleep(10 * time.Millisecond)
+
 		channels, err = client.PubSubShardChannels(ctx, "mychannel*").Result()
 		Expect(err).NotTo(HaveOccurred())
 		Expect(channels).To(ConsistOf([]string{"mychannel", "mychannel2"}))