cadonna commented on a change in pull request #10266:
URL: https://github.com/apache/kafka/pull/10266#discussion_r591236863



##########
File path: 
streams/src/test/java/org/apache/kafka/streams/processor/internals/InternalTopicManagerTest.java
##########
@@ -451,6 +465,550 @@ public void 
shouldExhaustRetriesOnMarkedForDeletionTopic() {
         );
     }
 
+    @Test
+    public void shouldValidateSuccessfully() {
+        mockAdminClient.addTopic(
+            false,
+            topic1,
+            Collections.singletonList(new TopicPartitionInfo(0, broker1, 
cluster, Collections.emptyList())),
+            null
+        );
+        final InternalTopicConfig internalTopicConfig = new 
RepartitionTopicConfig(topic1, Collections.emptyMap());
+        internalTopicConfig.setNumberOfPartitions(1);
+
+        final ValidationResult validationResult = 
internalTopicManager.validate(Collections.singletonMap(topic1, 
internalTopicConfig));
+
+        assertThat(validationResult.missingTopics, empty());
+        assertThat(validationResult.misconfigurationsForTopics, anEmptyMap());
+    }
+
+    @Test
+    public void shouldValidateSuccessfullyWithEmptyInternalTopics() {
+        mockAdminClient.addTopic(
+            false,
+            topic1,
+            Collections.singletonList(new TopicPartitionInfo(0, broker1, 
cluster, Collections.emptyList())),
+            null
+        );
+        final InternalTopicConfig internalTopicConfig = new 
RepartitionTopicConfig(topic1, Collections.emptyMap());

Review comment:
       Good catch! Thanks!




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