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BAEL-6040 Add Java List tests. (#13255)
* BAEL-6040 Add list interface example. * BAEL-6040 Updated list iterator. * BAEL-6040 Removed logger import. * BAEL-6040 Added List interface tests. * BAEL-6040 Update tests success names. * BAEL-6040 Small names refactoring. * BAEL-6040 Add new core-java-collections-5 module. * BAEL-6040 Create module core-java-collections-list-5. * BAEL-6040 Create module core-java-collections-list-5.
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‎core-java-modules/core-java-collections-list-5/README.md‎

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## Core Java Collections List (Part 5)
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This module contains articles about the Java List collection
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### Relevant Articles:

‎core-java-modules/core-java-collections-list-5/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<artifactId>core-java-collections-list-5</artifactId>
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<version>0.1.0-SNAPSHOT</version>
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<name>core-java-collections-list-5</name>
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<packaging>jar</packaging>
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<parent>
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<groupId>com.baeldung.core-java-modules</groupId>
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<artifactId>core-java-modules</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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</parent>
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<dependencies>
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<dependency>
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<groupId>commons-lang</groupId>
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<artifactId>commons-lang</artifactId>
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<version>${commons-lang.version}</version>
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</dependency>
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<dependency>
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<groupId>org.apache.commons</groupId>
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<artifactId>commons-lang3</artifactId>
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<version>${commons-lang3.version}</version>
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</dependency>
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</dependencies>
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<properties>
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<commons-lang.version>2.2</commons-lang.version>
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<commons-lang3.version>3.12.0</commons-lang3.version>
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</properties>
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</project>

‎core-java-modules/core-java-collections-list-5/src/test/java/com/baeldung/java/list/ListUnitTest.java‎

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package com.baeldung.java.list;
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import static org.junit.Assert.assertEquals;
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import static org.junit.Assert.assertFalse;
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import static org.junit.Assert.assertTrue;
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import java.util.ArrayList;
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import java.util.Comparator;
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import java.util.Iterator;
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import java.util.List;
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import org.junit.Test;
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public class ListUnitTest {
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@Test
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public void givenAFruitList_whenAddNewFruit_thenFruitIsAdded(){
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List<String> fruits = new ArrayList<>();
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assertEquals("Unexpected number of fruits in the list, should have been 0", 0, fruits.size());
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fruits.add("Apple");
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assertEquals("Unexpected number of fruits in the list, should have been 1", 1, fruits.size());
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}
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@Test
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public void givenAFruitList_whenContainsFruit_thenFruitIsInTheList(){
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List<String> fruits = new ArrayList<>();
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fruits.add("Apple");
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assertTrue("Apple should be in the fruit list", fruits.contains("Apple"));
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assertFalse("Banana should not be in the fruit list", fruits.contains("Banana"));
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}
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@Test
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public void givenAnEmptyFruitList_whenEmptyCheck_thenListIsEmpty(){
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List<String> fruits = new ArrayList<>();
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assertTrue("Fruit list should be empty", fruits.isEmpty());
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fruits.add("Apple");
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assertFalse("Fruit list should not be empty", fruits.isEmpty());
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}
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@Test
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public void givenAFruitList_whenIterateOverIt_thenFruitsAreInOrder(){
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List<String> fruits = new ArrayList<>();
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fruits.add("Apple"); // fruit at index 0
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fruits.add("Orange");// fruit at index 1
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fruits.add("Banana");// fruit at index 2
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int index = 0;
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for (Iterator<String> it = fruits.listIterator(); it.hasNext(); ) {
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String fruit = it.next();
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assertEquals("Fruits should be in order", fruits.get(index++), fruit);
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}
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}
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@Test
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public void givenAFruitList_whenRemoveFruit_thenFruitIsRemoved(){
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List<String> fruits = new ArrayList<>();
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fruits.add("Apple");
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fruits.add("Orange");
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assertEquals("Unexpected number of fruits in the list, should have been 2", 2, fruits.size());
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fruits.remove("Apple");
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assertEquals("Unexpected number of fruits in the list, should have been 1", 1, fruits.size());
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}
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@Test
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public void givenAFruitList_whenSetFruit_thenFruitIsUpdated(){
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List<String> fruits = new ArrayList<>();
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fruits.add("Apple");
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fruits.add("Orange");
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fruits.set(0, "Banana");
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assertEquals("Fruit at index 0 should be Banana", "Banana", fruits.get(0));
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}
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@Test
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public void givenAFruitList_whenSort_thenFruitsAreSorted(){
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List<String> fruits = new ArrayList<>();
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fruits.add("Apple");
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fruits.add("Orange");
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fruits.add("Banana");
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fruits.sort(Comparator.naturalOrder());
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assertEquals("Fruit at index 0 should be Apple", "Apple", fruits.get(0));
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assertEquals("Fruit at index 1 should be Banana", "Banana", fruits.get(1));
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assertEquals("Fruit at index 2 should be Orange", "Orange", fruits.get(2));
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}
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@Test
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public void givenAFruitList_whenSublist_thenWeGetASublist(){
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List<String> fruits = new ArrayList<>();
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fruits.add("Apple");
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fruits.add("Orange");
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fruits.add("Banana");
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List<String> fruitsSublist = fruits.subList(0, 2);
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assertEquals("Unexpected number of fruits in the sublist, should have been 2", 2, fruitsSublist.size());
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assertEquals("Fruit at index 0 should be Apple", "Apple", fruitsSublist.get(0));
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assertEquals("Fruit at index 1 should be Orange", "Orange", fruitsSublist.get(1));
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}
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@Test
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public void givenAFruitList_whenToArray_thenWeGetAnArray(){
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List<String> fruits = new ArrayList<>();
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fruits.add("Apple");
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fruits.add("Orange");
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fruits.add("Banana");
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String[] fruitsArray = fruits.toArray(new String[0]);
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assertEquals("Unexpected number of fruits in the array, should have been 3", 3, fruitsArray.length);
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assertEquals("Fruit at index 0 should be Apple", "Apple", fruitsArray[0]);
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assertEquals("Fruit at index 1 should be Orange", "Orange", fruitsArray[1]);
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assertEquals("Fruit at index 2 should be Banana", "Banana", fruitsArray[2]);
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}
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}

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