--- /dev/null
+package de.juplo.kafka.wordcount.top10;
+
+import lombok.extern.slf4j.Slf4j;
+import org.apache.kafka.streams.*;
+import org.apache.kafka.streams.state.Stores;
+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 java.util.List;
+import java.util.Map;
+import java.util.Properties;
+
+import static de.juplo.kafka.wordcount.counter.TestData.convertToMap;
+import static de.juplo.kafka.wordcount.counter.TestData.parseHeader;
+import static org.springframework.kafka.support.mapping.AbstractJavaTypeMapper.DEFAULT_CLASSID_FIELD_NAME;
+import static org.springframework.kafka.support.mapping.AbstractJavaTypeMapper.KEY_DEFAULT_CLASSID_FIELD_NAME;
+
+
+@Slf4j
+public class Top10StreamProcessorTopologyTest
+{
+ public final static String IN = "TEST-IN";
+ public final static String OUT = "TEST-OUT";
+
+ @Test
+ public void test()
+ {
+ Topology topology = CounterStreamProcessor.buildTopology(
+ IN,
+ OUT,
+ Stores.inMemoryKeyValueStore("TOPOLOGY-TEST"));
+
+ CounterApplicationConfiguriation applicationConfiguriation =
+ new CounterApplicationConfiguriation();
+ Properties streamProcessorProperties =
+ applicationConfiguriation.streamProcessorProperties(new CounterApplicationProperties());
+ Map<String, Object> propertyMap = convertToMap(streamProcessorProperties);
+
+ JsonSerde<?> keySerde = new JsonSerde<>();
+ keySerde.configure(propertyMap, true);
+ JsonSerde<?> valueSerde = new JsonSerde<>();
+ valueSerde.configure(propertyMap, false);
+
+ TopologyTestDriver testDriver = new TopologyTestDriver(topology, streamProcessorProperties);
+
+ TestInputTopic<String, Word> in = testDriver.createInputTopic(
+ IN,
+ (JsonSerializer<String>)keySerde.serializer(),
+ (JsonSerializer<Word>)valueSerde.serializer());
+
+ TestOutputTopic<Word, WordCounter> out = testDriver.createOutputTopic(
+ OUT,
+ (JsonDeserializer<Word>)keySerde.deserializer(),
+ (JsonDeserializer<WordCounter>)valueSerde.deserializer());
+
+ TestData.writeInputData((key, value) -> in.pipeInput(key, value));
+
+ List<KeyValue<Word, WordCounter>> receivedMessages = out
+ .readRecordsToList()
+ .stream()
+ .map(record ->
+ {
+ log.debug(
+ "OUT: {} -> {}, {}, {}",
+ record.key(),
+ record.value(),
+ parseHeader(record.headers(), KEY_DEFAULT_CLASSID_FIELD_NAME),
+ parseHeader(record.headers(), DEFAULT_CLASSID_FIELD_NAME));
+ return KeyValue.pair(record.key(), record.value());
+ })
+ .toList();
+
+ TestData.assertExpectedResult(receivedMessages);
+ }
+}