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package com.technologyconversations.java8exercises.streams;
import org.junit.Test;
import java.util.List;
import static com.technologyconversations.java8exercises.streams.PeopleStats.*;
import static java.util.Arrays.asList;
import static org.assertj.core.api.Assertions.assertThat;
/*
Get people statistics: average age, count, maximum age, minimum age and sum og all ages.
*/
public class PeopleStatsSpec {
Person sara = new Person("Sara", 4);
Person viktor = new Person("Viktor", 40);
Person eva = new Person("Eva", 42);
List<Person> collection = asList(sara, eva, viktor);
@Test
public void getStatsShouldReturnAverageAge() {
assertThat(getStats(collection).getAverage())
.isEqualTo((double)(4 + 40 + 42) / 3);
}
@Test
public void getStatsShouldReturnNumberOfPeople() {
assertThat(getStats(collection).getCount())
.isEqualTo(3);
}
@Test
public void getStatsShouldReturnMaximumAge() {
assertThat(getStats(collection).getMax())
.isEqualTo(42);
}
@Test
public void getStatsShouldReturnMinimumAge() {
assertThat(getStats(collection).getMin())
.isEqualTo(4);
}
@Test
public void getStatsShouldReturnSumOfAllAges() {
assertThat(getStats(collection).getSum())
.isEqualTo(40 + 42 + 4);
}
}
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