package com.baeldung.distinct;

import static org.junit.Assert.assertTrue;
import static com.baeldung.distinct.DistinctWithJavaFunction.distinctByKey;

import java.util.List;
import java.util.stream.Collectors;

import org.junit.Before;
import org.junit.Test;

public class DistinctWithJavaFunctionUnitTest {
    List<Person> personList;

    @Before
    public void init() {
        personList = PersonDataGenerator.getPersonListWithFakeValues();
    }

    @Test
    public void whenFilterListByName_thenSizeShouldBe4() {
        List<Person> personListFiltered = personList.stream().filter(distinctByKey(p -> p.getName())).collect(Collectors.toList());
        assertTrue(personListFiltered.size() == 4);
    }

    @Test
    public void whenFilterListByAge_thenSizeShouldBe2() {
        List<Person> personListFiltered = personList.stream().filter(distinctByKey(p -> p.getAge())).collect(Collectors.toList());
        assertTrue(personListFiltered.size() == 2);
    }

    @Test
    public void whenFilterListWithDefaultDistinct_thenSizeShouldBe5() {
        List<Person> personListFiltered = personList.stream().distinct().collect(Collectors.toList());
        assertTrue(personListFiltered.size() == 5);
    }

}