BAEL-8985 Guide to the Java ArrayList Create SequencedArrayListUnitTest.java (#18083)

* Create SequencedArrayListUnitTest.java

* Update SequencedArrayListUnitTest.java

* Update SequencedArrayListUnitTest.java

* Update pom.xml

Author: dvohra09

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

@@ -14,6 +14,13 @@
     </parent>
 
     <dependencies>
+        <!-- https://mvnrepository.com/artifact/org.junit.jupiter/junit-jupiter -->
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>5.11.3</version>
+            <scope>test</scope>
+        </dependency>
         <dependency>
             <groupId>org.apache.commons</groupId>
             <artifactId>commons-collections4</artifactId>
@@ -49,4 +56,4 @@
         <maven-compiler-plugin.target>21</maven-compiler-plugin.target>
     </properties>
 
-</project>
+</project>

core-java-modules/core-java-collections-array-list/src/test/java/com/baeldung/collections/SequencedArrayListUnitTest.java

@@ -0,0 +1,67 @@
+package com.baeldung.collections;
+
+ 
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import org.junit.jupiter.api.Test; 
+import java.util.Arrays; 
+import java.util.ArrayList;
+
+public class SequencedArrayListUnitTest {
+
+    @Test
+    public void givenSequencedArrayList_whenGetFirst_thenFirstElementReturnedCorrectly() {
+
+        ArrayList<Integer> arrayList = new ArrayList<Integer>(Arrays.asList(3,1,2));
+
+        Integer expectedElement=3;
+        assertEquals(expectedElement, arrayList.getFirst());
+    } 
+
+    @Test
+    public void givenSequencedArrayList_whenGetLast_thenLastElementReturnedCorrectly() {
+       
+        ArrayList<Integer> arrayList = new ArrayList<Integer>(Arrays.asList(3,1,2));
+
+        Integer expectedElement=2;
+        assertEquals(expectedElement, arrayList.getLast());
+    } 
+
+    @Test
+    public void givenSequencedArrayList_whenAddFirst_thenFirstElementAddedCorrectly() {
+
+        ArrayList<Integer> arrayList = new ArrayList<Integer>(Arrays.asList(3,1,2));
+        arrayList.addFirst(4);
+     
+        Integer expectedElement=4;
+        assertEquals(expectedElement, arrayList.getFirst());
+    } 
+
+    @Test
+    public void givenSequencedArrayList_whenAddLast_thenLastElementAddedCorrectly() {
+       
+        ArrayList<Integer> arrayList = new ArrayList<Integer>(Arrays.asList(3,1,2));
+        arrayList.addLast(5);
+    
+        Integer expectedElement=5;
+        assertEquals(expectedElement, arrayList.getLast());
+    } 
+
+    @Test
+    public void givenSequencedArrayList_whenRemoveFirst_thenFirstElementRemovedCorrectly() {
+
+        ArrayList<Integer> arrayList = new ArrayList<Integer>(Arrays.asList(3,1,2));
+       
+        Integer expectedElement=3;
+        assertEquals(expectedElement, arrayList.removeFirst());
+    } 
+
+    @Test
+    public void givenSequencedArrayList_whenRemoveLast_thenLastElementRemovedCorrectly() {
+       
+        ArrayList<Integer> arrayList = new ArrayList<Integer>(Arrays.asList(3,1,2));
+     
+        Integer expectedElement=2;
+        assertEquals(expectedElement, arrayList.removeLast());
+    } 
+
+}