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new tests

This commit is contained in:
eugenp 2013-12-25 23:41:29 +02:00
parent ba8559ab50
commit 6633f5b9a0
2 changed files with 77 additions and 2 deletions
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69
core-java-8/src/test/java/org/baeldung/java8/Java8SortUnitTest.java
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@ -1,8 +1,10 @@
package org.baeldung.java8;
import static org.baeldung.java8.entity.Human.compareByNameThenAge;
import static org.hamcrest.Matchers.equalTo;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import org.baeldung.java8.entity.Human;
@ -16,6 +18,18 @@ public class Java8SortUnitTest {
// tests -
@Test
public final void givenPreLambda_whenSortingEntitiesByName_thenCorrectlySorted() {
final List<Human> humans = Lists.newArrayList(new Human("Sarah", 10), new Human("Jack", 12));
Collections.sort(humans, new Comparator<Human>() {
@Override
public final int compare(final Human h1, final Human h2) {
return h1.getName().compareTo(h2.getName());
}
});
Assert.assertThat(humans.get(0), equalTo(new Human("Jack", 12)));
}
@Test
public final void whenSortingEntitiesByName_thenCorrectlySorted() {
final List<Human> humans = Lists.newArrayList(new Human("Sarah", 10), new Human("Jack", 12));
@ -24,10 +38,61 @@ public class Java8SortUnitTest {
}
@Test
public final void whenSortingEntitiesByAge_thenCorrectlySorted() {
public final void givenLambdaShortForm_whenSortingEntitiesByName_thenCorrectlySorted() {
final List<Human> humans = Lists.newArrayList(new Human("Sarah", 10), new Human("Jack", 12));
Collections.sort(humans, (final Human h1, final Human h2) -> Ints.compare(h1.getAge(), h2.getAge()));
Collections.sort(humans, (h1, h2) -> h1.getName().compareTo(h2.getName()));
Assert.assertThat(humans.get(0), equalTo(new Human("Jack", 12)));
}
@Test
public final void whenSortingEntitiesByNameThenAge_thenCorrectlySorted() {
final List<Human> humans = Lists.newArrayList(new Human("Sarah", 12), new Human("Sarah", 10), new Human("Zack", 12));
Collections.sort(humans, (lhs, rhs) -> {
if (lhs.getName().equals(rhs.getName())) {
return lhs.getAge() - rhs.getAge();
} else {
return lhs.getName().compareTo(rhs.getName());
}
});
Assert.assertThat(humans.get(0), equalTo(new Human("Sarah", 10)));
}
@Test
public final void givenComposition_whenSortingEntitiesByNameThenAge_thenCorrectlySorted() {
final List<Human> humans = Lists.newArrayList(new Human("Sarah", 12), new Human("Sarah", 10), new Human("Zack", 12));
final Comparator<Human> byName = (h1, h2) -> h1.getName().compareTo(h2.getName());
final Comparator<Human> byAge = (h1, h2) -> Ints.compare(h1.getAge(), h2.getAge());
Collections.sort(humans, byName.thenComparing(byAge));
Assert.assertThat(humans.get(0), equalTo(new Human("Sarah", 10)));
}
@Test
public final void whenSortingEntitiesByAge_thenCorrectlySorted() {
final List<Human> humans = Lists.newArrayList(new Human("Sarah", 10), new Human("Jack", 12));
Collections.sort(humans, (h1, h2) -> Ints.compare(h1.getAge(), h2.getAge()));
Assert.assertThat(humans.get(0), equalTo(new Human("Sarah", 10)));
}
@Test
public final void whenSortingEntitiesByNameReversed_thenCorrectlySorted() {
final List<Human> humans = Lists.newArrayList(new Human("Sarah", 10), new Human("Jack", 12));
final Comparator<Human> comparator = (h1, h2) -> h1.getName().compareTo(h2.getName());
Collections.sort(humans, comparator.reversed());
Assert.assertThat(humans.get(0), equalTo(new Human("Sarah", 10)));
}
@Test
public final void givenMethodDefinition_whenSortingEntitiesByNameThenAge_thenCorrectlySorted() {
final List<Human> humans = Lists.newArrayList(new Human("Sarah", 10), new Human("Jack", 12));
Collections.sort(humans, Human::compareByNameThenAge);
Assert.assertThat(humans.get(0), equalTo(new Human("Jack", 12)));
}
@Test
public final void givenInstanceMethod_whenSortingEntitiesByName_thenCorrectlySorted() {
final List<Human> humans = Lists.newArrayList(new Human("Sarah", 10), new Human("Jack", 12));
Collections.sort(humans, Comparator.comparing(Human::getName));
Assert.assertThat(humans.get(0), equalTo(new Human("Jack", 12)));
}
}

10
core-java-8/src/test/java/org/baeldung/java8/entity/Human.java
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@ -33,6 +33,16 @@ public class Human {
this.age = age;
}
// compare
public static int compareByNameThenAge(final Human lhs, final Human rhs) {
if (lhs.name.equals(rhs.name)) {
return lhs.age - rhs.age;
} else {
return lhs.name.compareTo(rhs.name);
}
}
//
@Override