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package com.technologyconversations.java8exercises.streams;
import org.junit.Test;
import java.util.List;
import java.util.Map;
import static com.technologyconversations.java8exercises.streams.Grouping.*;
import static java.util.Arrays.asList;
import static org.assertj.core.api.Assertions.assertThat;
Group people by nationality
public class GroupingSpec {
public void partitionAdultsShouldSeparateKidsFromAdults() {
Person sara = new Person("Sara", 4, "Norwegian");
Person viktor = new Person("Viktor", 40, "Serbian");
Person eva = new Person("Eva", 42, "Norwegian");
List<Person> collection = asList(sara, eva, viktor);
Map<String, List<Person>> result = groupByNationality(collection);
assertThat(result.get("Norwegian")).hasSameElementsAs(asList(sara, eva));
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