ableegoldman commented on a change in pull request #10683:
URL: https://github.com/apache/kafka/pull/10683#discussion_r679572637



##########
File path: 
streams/src/test/java/org/apache/kafka/streams/integration/NamedTopologyIntegrationTest.java
##########
@@ -16,17 +16,240 @@
  */
 package org.apache.kafka.streams.integration;
 
+import org.apache.kafka.clients.consumer.ConsumerConfig;
+import org.apache.kafka.common.serialization.LongDeserializer;
+import org.apache.kafka.common.serialization.LongSerializer;
+import org.apache.kafka.common.serialization.Serdes;
+import org.apache.kafka.common.serialization.StringDeserializer;
+import org.apache.kafka.common.serialization.StringSerializer;
+import org.apache.kafka.streams.KafkaClientSupplier;
+import org.apache.kafka.streams.KeyValue;
+import org.apache.kafka.streams.StreamsConfig;
+import org.apache.kafka.streams.integration.utils.EmbeddedKafkaCluster;
+import org.apache.kafka.streams.integration.utils.IntegrationTestUtils;
+import org.apache.kafka.streams.kstream.Materialized;
+import org.apache.kafka.streams.processor.internals.DefaultKafkaClientSupplier;
+import 
org.apache.kafka.streams.processor.internals.namedtopology.KafkaStreamsNamedTopologyWrapper;
+import 
org.apache.kafka.streams.processor.internals.namedtopology.NamedTopology;
+import 
org.apache.kafka.streams.processor.internals.namedtopology.NamedTopologyStreamsBuilder;
+import org.apache.kafka.streams.state.Stores;
+import org.apache.kafka.test.TestUtils;
+
+import org.junit.After;
+import org.junit.AfterClass;
+import org.junit.Before;
+import org.junit.BeforeClass;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.TestName;
+import java.io.IOException;
+import java.time.Duration;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+import java.util.Properties;
+import java.util.Set;
+import java.util.regex.Pattern;
+
+import static 
org.apache.kafka.streams.integration.utils.IntegrationTestUtils.safeUniqueTestName;
+import static 
org.apache.kafka.streams.integration.utils.IntegrationTestUtils.waitUntilMinKeyValueRecordsReceived;
+
+import static org.hamcrest.CoreMatchers.equalTo;
+import static org.hamcrest.CoreMatchers.is;
+import static org.hamcrest.MatcherAssert.assertThat;
+import static java.util.Arrays.asList;
+import static java.util.Collections.singletonList;
+
 public class NamedTopologyIntegrationTest {
-    //TODO KAFKA-12648
-    /**
-     * Things to test in Pt. 2 -  Introduce TopologyMetadata to wrap 
InternalTopologyBuilders of named topologies:
-     * 1. Verify changelog & repartition topics decorated with named topology
-     * 2. Make sure app run and works with
-     *         -multiple subtopologies
-     *         -persistent state
-     *         -multi-partition input & output topics
-     *         -standbys
-     *         -piped input and verified output records
-     * 3. Is the task assignment balanced? Does KIP-441/warmup replica 
placement work as intended?
-     */
+
+    private static final int NUM_BROKERS = 1;
+
+    public static final EmbeddedKafkaCluster CLUSTER = new 
EmbeddedKafkaCluster(NUM_BROKERS);
+
+    @BeforeClass
+    public static void startCluster() throws IOException {
+        CLUSTER.start();
+    }
+
+    @AfterClass
+    public static void closeCluster() {
+        CLUSTER.stop();
+    }
+
+    @Rule
+    public final TestName testName = new TestName();
+    private String appId;
+
+    private String inputStream1;
+    private String inputStream2;
+    private String inputStream3;
+    private String outputStream1;
+    private String outputStream2;
+    private String outputStream3;
+    private String storeChangelog1;
+    private String storeChangelog2;
+    private String storeChangelog3;
+
+    final List<KeyValue<String, Long>> standardInputData = 
asList(KeyValue.pair("A", 100L), KeyValue.pair("B", 200L), KeyValue.pair("A", 
300L), KeyValue.pair("C", 400L));
+    final List<KeyValue<String, Long>> standardOutputData = 
asList(KeyValue.pair("B", 1L), KeyValue.pair("A", 2L), KeyValue.pair("C", 1L)); 
// output of basic count topology with caching
+
+    final KafkaClientSupplier clientSupplier = new 
DefaultKafkaClientSupplier();
+    final Properties producerConfig = 
TestUtils.producerConfig(CLUSTER.bootstrapServers(), StringSerializer.class, 
LongSerializer.class);
+    final Properties consumerConfig = 
TestUtils.consumerConfig(CLUSTER.bootstrapServers(), StringDeserializer.class, 
LongDeserializer.class);
+
+    final NamedTopologyStreamsBuilder builder1 = new 
NamedTopologyStreamsBuilder("topology-1");
+    final NamedTopologyStreamsBuilder builder2 = new 
NamedTopologyStreamsBuilder("topology-2");
+    final NamedTopologyStreamsBuilder builder3 = new 
NamedTopologyStreamsBuilder("topology-3");
+
+    Properties props;
+    KafkaStreamsNamedTopologyWrapper streams;
+
+    private Properties configProps() {
+        final Properties streamsConfiguration = new Properties();
+        streamsConfiguration.put(StreamsConfig.APPLICATION_ID_CONFIG, appId);
+        streamsConfiguration.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, 
CLUSTER.bootstrapServers());
+        streamsConfiguration.put(StreamsConfig.STATE_DIR_CONFIG, 
TestUtils.tempDirectory(appId).getPath());
+        streamsConfiguration.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, 
Serdes.String().getClass());
+        
streamsConfiguration.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, 
Serdes.Long().getClass());
+        streamsConfiguration.put(StreamsConfig.NUM_STREAM_THREADS_CONFIG, 2);
+        streamsConfiguration.put(StreamsConfig.COMMIT_INTERVAL_MS_CONFIG, 
1000L);
+        streamsConfiguration.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, 
"earliest");
+        return streamsConfiguration;
+    }
+
+    @Before

Review comment:
       Good point, most of them can share the same topics/input data and can 
save this repeated setup/teardown. A few do need their own topics so they can 
control when input data appears on which topic, but we can just handle those 
few separately -- I'll move most of this to a @Before/AfterClass




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