From a7c3a493ee3b6ec8629eb749d1ce4ed059f4cff9 Mon Sep 17 00:00:00 2001
From: Kai Moritz <kai@juplo.de>
Date: Sat, 8 Jun 2024 18:05:45 +0200
Subject: [PATCH] top10: 1.2.1 - Simplified setup of
 `Top10StreamProcessorToplogyTest`

---
 .../top10/Top10ApplicationConfiguration.java  |  6 +--
 .../Top10StreamProcessorTopologyTest.java     | 40 +++++++++++--------
 2 files changed, 25 insertions(+), 21 deletions(-)

diff --git a/src/main/java/de/juplo/kafka/wordcount/top10/Top10ApplicationConfiguration.java b/src/main/java/de/juplo/kafka/wordcount/top10/Top10ApplicationConfiguration.java
index bd5298d..5e56066 100644
--- a/src/main/java/de/juplo/kafka/wordcount/top10/Top10ApplicationConfiguration.java
+++ b/src/main/java/de/juplo/kafka/wordcount/top10/Top10ApplicationConfiguration.java
@@ -13,8 +13,6 @@ import org.springframework.context.annotation.Configuration;
 import org.springframework.kafka.support.serializer.JsonDeserializer;
 import org.springframework.kafka.support.serializer.JsonSerde;
 
-import java.util.HashMap;
-import java.util.Map;
 import java.util.Properties;
 import java.util.concurrent.CompletableFuture;
 
@@ -46,9 +44,9 @@ public class Top10ApplicationConfiguration
 		return props;
 	}
 
-	static Map<String, Object> serializationConfig()
+	static Properties serializationConfig()
 	{
-		Map<String, Object> props = new HashMap<>();
+		Properties props = new Properties();
 
 		props.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, JsonSerde.class.getName());
 		props.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, JsonSerde.class.getName());
diff --git a/src/test/java/de/juplo/kafka/wordcount/top10/Top10StreamProcessorTopologyTest.java b/src/test/java/de/juplo/kafka/wordcount/top10/Top10StreamProcessorTopologyTest.java
index 84cfb1e..80fc0df 100644
--- a/src/test/java/de/juplo/kafka/wordcount/top10/Top10StreamProcessorTopologyTest.java
+++ b/src/test/java/de/juplo/kafka/wordcount/top10/Top10StreamProcessorTopologyTest.java
@@ -1,5 +1,7 @@
 package de.juplo.kafka.wordcount.top10;
 
+import de.juplo.kafka.wordcount.counter.TestCounter;
+import de.juplo.kafka.wordcount.counter.TestWord;
 import lombok.extern.slf4j.Slf4j;
 import org.apache.kafka.streams.TestInputTopic;
 import org.apache.kafka.streams.TestOutputTopic;
@@ -11,13 +13,11 @@ import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 import org.springframework.kafka.support.serializer.JsonDeserializer;
-import org.springframework.kafka.support.serializer.JsonSerde;
 import org.springframework.kafka.support.serializer.JsonSerializer;
 import org.springframework.util.LinkedMultiValueMap;
 import org.springframework.util.MultiValueMap;
 
 import java.util.Map;
-import java.util.Properties;
 import java.util.stream.Stream;
 
 import static de.juplo.kafka.wordcount.top10.Top10ApplicationConfiguration.serializationConfig;
@@ -44,27 +44,21 @@ public class Top10StreamProcessorTopologyTest
         OUT,
         Stores.inMemoryKeyValueStore(STORE_NAME));
 
-    Map<String, Object> propertyMap = serializationConfig();
-
-    Properties properties = new Properties();
-    properties.putAll(propertyMap);
-
-    JsonSerde<?> keySerde = new JsonSerde<>();
-    keySerde.configure(propertyMap, true);
-    JsonSerde<?> valueSerde = new JsonSerde<>();
-    valueSerde.configure(propertyMap, false);
-
-    testDriver = new TopologyTestDriver(topology, properties);
+    testDriver = new TopologyTestDriver(topology, serializationConfig());
 
     in = testDriver.createInputTopic(
         IN,
-        (JsonSerializer<Key>)keySerde.serializer(),
-        (JsonSerializer<Entry>)valueSerde.serializer());
+        jsonSerializer(Key.class, true),
+        jsonSerializer(Entry.class,false));
 
     out = testDriver.createOutputTopic(
         OUT,
-        (JsonDeserializer<User>)keySerde.deserializer(),
-        (JsonDeserializer<Ranking>)valueSerde.deserializer());
+        new JsonDeserializer()
+            .copyWithType(User.class)
+            .ignoreTypeHeaders(),
+        new JsonDeserializer()
+            .copyWithType(Ranking.class)
+            .ignoreTypeHeaders());
 
   }
 
@@ -97,4 +91,16 @@ public class Top10StreamProcessorTopologyTest
   {
     testDriver.close();
   }
+
+  private <T> JsonSerializer<T> jsonSerializer(Class<T> type, boolean isKey)
+  {
+    JsonSerializer<T> jsonSerializer = new JsonSerializer<>();
+    jsonSerializer.configure(
+        Map.of(
+            JsonSerializer.TYPE_MAPPINGS,
+            "word:" + TestWord.class.getName() + "," +
+            "counter:" + TestCounter.class.getName()),
+        isKey);
+    return jsonSerializer;
+  }
 }
-- 
2.20.1