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Refactor JoinSplitCollectionsUnitTest

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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101
core-java/src/test/java/org/baeldung/java/collections/JoinSplitCollectionsUnitTest.java
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@ -1,31 +1,24 @@
package org.baeldung.java.collections;
import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import org.junit.Test;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.*;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import org.junit.Test;
import static org.junit.Assert.*;
public class JoinSplitCollectionsUnitTest {
@Test
public void whenJoiningTwoArrays_thenJoined() {
String[] animals1 = new String[] { "Dog", "Cat" };
String[] animals2 = new String[] { "Bird", "Cow" };
String[] animals1 = new String[]{"Dog", "Cat"};
String[] animals2 = new String[]{"Bird", "Cow"};
String[] result = Stream.concat(Arrays.stream(animals1), Arrays.stream(animals2))
.toArray(String[]::new);
assertArrayEquals(result, new String[] { "Dog", "Cat", "Bird", "Cow" });
.toArray(String[]::new);
assertArrayEquals(result, new String[]{"Dog", "Cat", "Bird", "Cow"});
}
@Test
@ -33,8 +26,8 @@ public class JoinSplitCollectionsUnitTest {
Collection<Integer> collection1 = Arrays.asList(7, 8, 9);
Collection<Integer> collection2 = Arrays.asList(10, 11, 12);
Collection<Integer> result = Stream.concat(collection1.stream(), collection2.stream())
.collect(Collectors.toList());
.collect(Collectors.toList());
assertTrue(result.equals(Arrays.asList(7, 8, 9, 10, 11, 12)));
}
@ -43,18 +36,18 @@ public class JoinSplitCollectionsUnitTest {
Collection<Integer> collection1 = Arrays.asList(7, 8, 11);
Collection<Integer> collection2 = Arrays.asList(9, 12, 10);
Collection<Integer> result = Stream.concat(collection1.stream(), collection2.stream())
.filter(next -> next <= 10)
.collect(Collectors.toList());
.filter(next -> next <= 10)
.collect(Collectors.toList());
assertTrue(result.equals(Arrays.asList(7, 8, 9, 10)));
}
@Test
public void whenConvertArrayToString_thenConverted() {
String[] colors = new String[] { "Red", "Blue", "Green", "Yellow" };
String[] colors = new String[]{"Red", "Blue", "Green", "Yellow"};
String result = Arrays.stream(colors)
.collect(Collectors.joining(", "));
.collect(Collectors.joining(", "));
assertEquals(result, "Red, Blue, Green, Yellow");
}
@ -62,8 +55,8 @@ public class JoinSplitCollectionsUnitTest {
public void whenConvertCollectionToString_thenConverted() {
Collection<String> directions = Arrays.asList("Left", "Right", "Top", "Bottom");
String result = directions.stream()
.collect(Collectors.joining(", "));
.collect(Collectors.joining(", "));
assertEquals(result, "Left, Right, Top, Bottom");
}
@ -73,11 +66,11 @@ public class JoinSplitCollectionsUnitTest {
users.put(1, "John Doe");
users.put(2, "Paul Smith");
users.put(3, "Susan Anderson");
String result = users.entrySet().stream()
.map(entry -> entry.getKey() + " = " + entry.getValue())
.collect(Collectors.joining(", "));
.map(entry -> entry.getKey() + " = " + entry.getValue())
.collect(Collectors.joining(", "));
assertEquals(result, "1 = John Doe, 2 = Paul Smith, 3 = Susan Anderson");
}
@ -86,12 +79,12 @@ public class JoinSplitCollectionsUnitTest {
Collection<List<String>> nested = new ArrayList<>();
nested.add(Arrays.asList("Left", "Right", "Top", "Bottom"));
nested.add(Arrays.asList("Red", "Blue", "Green", "Yellow"));
String result = nested.stream()
.map(nextList -> nextList.stream()
.collect(Collectors.joining("-")))
.collect(Collectors.joining("; "));
.map(nextList -> nextList.stream()
.collect(Collectors.joining("-")))
.collect(Collectors.joining("; "));
assertEquals(result, "Left-Right-Top-Bottom; Red-Blue-Green-Yellow");
}
@ -99,9 +92,9 @@ public class JoinSplitCollectionsUnitTest {
public void whenConvertCollectionToStringAndSkipNull_thenConverted() {
Collection<String> fruits = Arrays.asList("Apple", "Orange", null, "Grape");
String result = fruits.stream()
.filter(next -> next != null)
.collect(Collectors.joining(", "));
.filter(Objects::nonNull)
.collect(Collectors.joining(", "));
assertEquals(result, "Apple, Orange, Grape");
}
@ -112,7 +105,7 @@ public class JoinSplitCollectionsUnitTest {
Collection<Integer> result2 = new ArrayList<>();
AtomicInteger count = new AtomicInteger();
int midpoint = Math.round(numbers.size() / 2);
numbers.forEach(next -> {
int index = count.getAndIncrement();
if (index < midpoint) {
@ -121,17 +114,17 @@ public class JoinSplitCollectionsUnitTest {
result2.add(next);
}
});
assertTrue(result1.equals(Arrays.asList(1, 2, 3, 4, 5)));
assertTrue(result2.equals(Arrays.asList(6, 7, 8, 9, 10)));
}
@Test
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)
.collect(Collectors.groupingBy(word -> word.length()));
.collect(Collectors.groupingBy(String::length));
assertTrue(result.get(2).equals(Arrays.asList("it", "my")));
assertTrue(result.get(3).equals(Arrays.asList("bye", "and")));
assertTrue(result.get(4).equals(Arrays.asList("cold", "word")));
@ -141,26 +134,26 @@ public class JoinSplitCollectionsUnitTest {
public void whenConvertStringToArray_thenConverted() {
String colors = "Red, Blue, Green, Yellow";
String[] result = colors.split(", ");
assertArrayEquals(result, new String[] { "Red", "Blue", "Green", "Yellow" });
assertArrayEquals(result, new String[]{"Red", "Blue", "Green", "Yellow"});
}
@Test
public void whenConvertStringToCollection_thenConverted() {
String colors = "Left, Right, Top, Bottom";
Collection<String> result = Arrays.asList(colors.split(", "));
assertTrue(result.equals(Arrays.asList("Left", "Right", "Top", "Bottom")));
}
@Test
public void whenConvertStringToMap_thenConverted() {
String users = "1 = John Doe, 2 = Paul Smith, 3 = Susan Anderson";
Map<Integer, String> result = Arrays.stream(users.split(", "))
.map(next -> next.split(" = "))
.collect(Collectors.toMap(entry -> Integer.parseInt(entry[0]), entry -> entry[1]));
.map(next -> next.split(" = "))
.collect(Collectors.toMap(entry -> Integer.parseInt(entry[0]), entry -> entry[1]));
assertEquals(result.get(1), "John Doe");
assertEquals(result.get(2), "Paul Smith");
assertEquals(result.get(3), "Susan Anderson");
@ -169,12 +162,12 @@ public class JoinSplitCollectionsUnitTest {
@Test
public void whenConvertCollectionToStringMultipleSeparators_thenConverted() {
String fruits = "Apple. , Orange, Grape. Lemon";
Collection<String> result = Arrays.stream(fruits.split("[,|.]"))
.map(String::trim)
.filter(next -> !next.isEmpty())
.collect(Collectors.toList());
.map(String::trim)
.filter(next -> !next.isEmpty())
.collect(Collectors.toList());
assertTrue(result.equals(Arrays.asList("Apple", "Orange", "Grape", "Lemon")));
}
}