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Refactor JoinSplitCollectionsUnitTest

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This commit is contained in:
pivovarit 2016-12-03 17:09:34 +01:00
parent 34e5a6475f
commit a6bdad2cb9
1 changed files with 47 additions and 54 deletions
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17
core-java/src/test/java/org/baeldung/java/collections/JoinSplitCollectionsUnitTest.java
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@ -1,20 +1,13 @@
package org.baeldung.java.collections; package org.baeldung.java.collections;
import static org.junit.Assert.assertArrayEquals; import org.junit.Test;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import java.util.ArrayList; import java.util.*;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.atomic.AtomicInteger; import java.util.concurrent.atomic.AtomicInteger;
import java.util.stream.Collectors; import java.util.stream.Collectors;
import java.util.stream.Stream; import java.util.stream.Stream;
import org.junit.Test; import static org.junit.Assert.*;
public class JoinSplitCollectionsUnitTest { public class JoinSplitCollectionsUnitTest {
@ -99,7 +92,7 @@ public class JoinSplitCollectionsUnitTest {
public void whenConvertCollectionToStringAndSkipNull_thenConverted() { public void whenConvertCollectionToStringAndSkipNull_thenConverted() {
Collection<String> fruits = Arrays.asList("Apple", "Orange", null, "Grape"); Collection<String> fruits = Arrays.asList("Apple", "Orange", null, "Grape");
String result = fruits.stream() String result = fruits.stream()
.filter(next -> next != null) .filter(Objects::nonNull)
.collect(Collectors.joining(", ")); .collect(Collectors.joining(", "));
assertEquals(result, "Apple, Orange, Grape"); assertEquals(result, "Apple, Orange, Grape");
@ -130,7 +123,7 @@ public class JoinSplitCollectionsUnitTest {
public void whenSplitArrayByWordLength_thenConverted() { public void whenSplitArrayByWordLength_thenConverted() {
String[] words = new String[]{"bye", "cold", "it", "and", "my", "word"}; String[] words = new String[]{"bye", "cold", "it", "and", "my", "word"};
Map<Integer, List<String>> result = Arrays.stream(words) Map<Integer, List<String>> result = Arrays.stream(words)
.collect(Collectors.groupingBy(word -> word.length())); .collect(Collectors.groupingBy(String::length));
assertTrue(result.get(2).equals(Arrays.asList("it", "my"))); assertTrue(result.get(2).equals(Arrays.asList("it", "my")));
assertTrue(result.get(3).equals(Arrays.asList("bye", "and"))); assertTrue(result.get(3).equals(Arrays.asList("bye", "and")));