Queue to list conversion (#16499)

* Queue to list conversion * Queue to list conversion * Queue to list conversion * Queue to list conversion * Queue to list conversion * Queue to list conversion --------- Co-authored-by: Neetika Khandelwal <kwal.neetika2398@gmail.com>
eugenp · May 8, 2024 · 05fc667 · 05fc667
1 parent 2b0cd01
commit 05fc667
Showing 1 changed file with 71 additions and 0 deletions.
diff --git a/...ions-conversions-3/src/test/java/com/baeldung/queuetolist/QueueToListConvertUnitTest.java b/...ions-conversions-3/src/test/java/com/baeldung/queuetolist/QueueToListConvertUnitTest.java
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+package com.baeldung.queuetolist;
+
+import com.google.common.collect.Lists;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import java.util.*;
+import java.util.stream.Collectors;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+public class QueueToListConvertUnitTest {
+
+    private Queue<String> queue;
+
+    @BeforeEach
+    public void beforeEach() {
+        queue = new LinkedList<>();
+        queue.add("AA");
+        queue.add("BB");
+        queue.add("CC");
+    }
+
+    @Test
+    public void givenAQueue_whenConvertUsingConstructor_thenReturnArrayList() {
+        List<String> list = new ArrayList<>(queue);
+
+        assertNotNull(list);
+        assertEquals(queue.size(), list.size());
+        assertTrue(list.containsAll(queue));
+    }
+
+    @Test
+    public void givenAQueue_whenConvertUsingAddAllMethod_thenReturnList() {
+        List<String> list = new ArrayList<>();
+        list.addAll(queue);
+
+        assertNotNull(list);
+        assertEquals(queue.size(), list.size());
+        assertTrue(list.containsAll(queue));
+    }
+
+    @Test
+    public void givenAQueue_whenConvertUsingConstructor_thenReturnLinkedList() {
+        LinkedList<String> list = new LinkedList<>(queue);
+
+        assertNotNull(list);
+        assertEquals(queue.size(), list.size());
+        assertTrue(list.containsAll(queue));
+    }
+
+    @Test
+    public void givenAQueue_whenConvertUsingStream_thenReturnList() {
+        List<String> list = queue.stream()
+            .collect(Collectors.toList());
+
+        assertNotNull(list);
+        assertEquals(queue.size(), list.size());
+        assertTrue(list.containsAll(queue));
+    }
+
+    @Test
+    public void givenAQueue_whenConvertUsingGuava_thenReturnList() {
+        List<String> list = Lists.newArrayList(queue);
+
+        assertNotNull(list);
+        assertEquals(queue.size(), list.size());
+        assertTrue(list.containsAll(queue));
+    }
+}