+package de.juplo.kafka.wordcount.counter;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.springframework.util.LinkedMultiValueMap;
+import org.springframework.util.MultiValueMap;
+
+import java.util.List;
+import java.util.function.BiConsumer;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+
+class TestData
+{
+ static void writeInputData(BiConsumer<String, String> consumer)
+ {
+ consumer.accept(
+ "peter",
+ "Hallo");
+ consumer.accept(
+ "klaus",
+ "Müsch");
+ consumer.accept(
+ "peter",
+ "Welt");
+ consumer.accept(
+ "klaus",
+ "Müsch");
+ consumer.accept(
+ "klaus",
+ "s");
+ consumer.accept(
+ "peter",
+ "Boäh");
+ consumer.accept(
+ "peter",
+ "Welt");
+ consumer.accept(
+ "peter",
+ "Boäh");
+ consumer.accept(
+ "klaus",
+ "s");
+ consumer.accept(
+ "peter",
+ "Boäh");
+ consumer.accept(
+ "klaus",
+ "s");
+ }
+
+ static void assertExpectedResult(List<Message> receivedMessages, ObjectMapper mapper)
+ {
+ MultiValueMap<String, Message> received = new LinkedMultiValueMap<>();
+
+ receivedMessages.forEach(message ->
+ {
+ try
+ {
+ Key key = mapper.readValue(message.getKey(), Key.class);
+ received.add(key.getUsername(), message);
+ }
+ catch (JsonProcessingException e)
+ {
+ throw new RuntimeException(e);
+ }
+ });
+
+ assertThat(received).hasSize(2);
+ assertThat(received.get("klaus")).containsExactly(klaus1, klaus2, klaus3, klaus4, klaus5);
+ assertThat(received.get("peter")).containsExactly(peter1, peter2, peter3, peter4, peter5, peter6);
+ }
+
+ static Message peter1 = Message.of(
+ "{\"username\":\"peter\",\"word\":\"Hallo\"}",
+ "1");
+ static Message peter2 = Message.of(
+ "{\"username\":\"peter\",\"word\":\"Welt\"}",
+ "1");
+ static Message peter3 = Message.of(
+ "{\"username\":\"peter\",\"word\":\"Boäh\"}",
+ "1");
+ static Message peter4 = Message.of(
+ "{\"username\":\"peter\",\"word\":\"Welt\"}",
+ "2");
+ static Message peter5 = Message.of(
+ "{\"username\":\"peter\",\"word\":\"Boäh\"}",
+ "2");
+ static Message peter6 = Message.of(
+ "{\"username\":\"peter\",\"word\":\"Boäh\"}",
+ "3");
+
+ static Message klaus1 = Message.of(
+ "{\"username\":\"klaus\",\"word\":\"Müsch\"}",
+ "1");
+ static Message klaus2 = Message.of(
+ "{\"username\":\"klaus\",\"word\":\"Müsch\"}",
+ "2");
+ static Message klaus3 = Message.of(
+ "{\"username\":\"klaus\",\"word\":\"s\"}",
+ "1");
+ static Message klaus4 = Message.of(
+ "{\"username\":\"klaus\",\"word\":\"s\"}",
+ "2");
+ static Message klaus5 = Message.of(
+ "{\"username\":\"klaus\",\"word\":\"s\"}",
+ "3");
+}