Fix flaky test: test pubsub shardchannels_true #4925

Author: hank95179

node/tests/PubSub.test.ts

@@ -3776,8 +3776,7 @@ describe("PubSub", () => {
                 return; // Skip test if server version is less than required
             }
 
-            let pubSub: GlideClusterClientConfiguration.PubSubSubscriptions | null =
-                null;
+            let pubSub: GlideClusterClientConfiguration.PubSubSubscriptions | null = null;
             let client1: TGlideClient | null = null;
             let client2: TGlideClient | null = null;
             let client: TGlideClient | null = null;
@@ -3811,15 +3810,26 @@ describe("PubSub", () => {
                     pubSub,
                 );
 
-                // Test pubsubShardchannels without pattern
-                const channels = await (
-                    client2 as GlideClusterClient
-                ).pubsubShardChannels();
-                expect(new Set(channels)).toEqual(
-                    new Set([channel1, channel2, channel3]),
-                );
-
-                // Test pubsubShardchannels with pattern
+                {
+                    // Wait up to 3 seconds (60 * 50ms)
+                    for (let i = 0; i < 60; i++) {
+                        try {
+                            const channels = await (client2 as GlideClusterClient).pubsubShardChannels();
+                            if (channels.length === 3) {
+                                break;
+                            }
+                        } catch (e) {
+                        }
+                        await new Promise((r) => setTimeout(r, 50));
+                    }
+                    const channels = await (
+                        client2 as GlideClusterClient
+                    ).pubsubShardChannels();
+                    
+                    expect(new Set(channels)).toEqual(
+                        new Set([channel1, channel2, channel3]),
+                    );
+                }
                 const channelsWithPattern = await (
                     client2 as GlideClusterClient
                 ).pubsubShardChannels({ pattern });