jhutchison commented on a change in pull request #6493:
URL: https://github.com/apache/geode/pull/6493#discussion_r635398954



##########
File path: 
geode-apis-compatible-with-redis/src/test/java/org/apache/geode/redis/internal/pubsub/SubscriptionsJUnitTest.java
##########
@@ -195,4 +197,70 @@ public void removeByClientAndPattern() {
                 channelSubscriberOne,
                 channelSubscriberTwo);
   }
+
+  @Test
+  public void 
findChannelNames_shouldReturnAllChannelNames_whenCalledWithoutParameter() {
+    Subscriptions subject = new Subscriptions();
+
+    Channel channel = mock(Channel.class);
+    when(channel.closeFuture()).thenReturn(mock(ChannelFuture.class));
+    Client client = new Client(channel);
+    ExecutionHandlerContext context = mock(ExecutionHandlerContext.class);
+
+    Subscription subscriptionFoo =
+        new ChannelSubscription(client, "foo".getBytes(), context, subject);
+
+    Subscription subscriptionBar =
+        new ChannelSubscription(client, "bar".getBytes(), context, subject);
+
+    subject.add(subscriptionFoo);
+    subject.add(subscriptionBar);
+
+    List<byte[]> result = subject.findChannelNames();
+
+    assertThat(result).containsExactlyInAnyOrder("foo".getBytes(), 
"bar".getBytes());
+  }
+
+  @Test
+  public void 
findChannelNames_shouldReturnOnlyMatchingChannelNames_whenCalledWithPattern() {
+    Subscriptions subject = new Subscriptions();
+    byte[] pattern = "b*".getBytes();
+
+    Channel channel = mock(Channel.class);
+    when(channel.closeFuture()).thenReturn(mock(ChannelFuture.class));
+    Client client = new Client(channel);
+    ExecutionHandlerContext context = mock(ExecutionHandlerContext.class);
+
+    subject.add(new ChannelSubscription(client, "foo".getBytes(), context, 
subject));
+    subject.add(new ChannelSubscription(client, "bar".getBytes(), context, 
subject));
+    subject.add(new ChannelSubscription(client, "barbarella".getBytes(), 
context, subject));

Review comment:
       babar the elephant




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