BAEL-5785 Map.of() vs Map.ofEntries() test (#13064)

* BAEL-5785 Map.of() vs Map.ofEntries() test

* Update pom.xml

* Update pom.xml

* Add immutable test case

* Update map naming

core-java-modules/core-java-collections-maps-5/src/test/java/com/baeldung/map/mapofvsmapofentries/MapOfEntriesVsMapOfUnitTest.java

@@ -0,0 +1,52 @@
+package com.baeldung.map.mapofvsmapofentries;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.Map;
+
+import static org.assertj.core.api.AssertionsForClassTypes.assertThat;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
+public class MapOfEntriesVsMapOfUnitTest {
+
+    @Test
+    void mapOf() {
+        // Use Map.of() to create an empty immutable map
+        Map<Long, String> map = Map.of();
+        assertNotNull(map);
+
+        // Use Map.of() to create an immutable map with one entry
+        Map<Long, String> mapWithEntry = Map.of(1L, "value1");
+        assertNotNull(mapWithEntry);
+        assertThat(mapWithEntry.size()).isEqualTo(1);
+        assertThat(mapWithEntry.get(1L)).isEqualTo("value1");
+        
+        // Test if map is immutable
+        try {
+            mapWithEntry.put(2L, "value2");
+        } catch (UnsupportedOperationException e) {
+            assertThat(e).isInstanceOf(UnsupportedOperationException.class);
+        }
+    }
+
+    @Test
+    void mapOfEntries() {
+        // Use Map.ofEntries() to create an empty immutable map
+        Map<Long, String> map = Map.ofEntries();
+        assertNotNull(map);
+
+        // Use Map.ofEntries() to create an immutable map with two entries.
+        Map<Long, String> longUserMap = Map.ofEntries(Map.entry(1L, "User A"), Map.entry(2L, "User B"));
+        assertNotNull(longUserMap);
+        assertThat(longUserMap.size()).isEqualTo(2);
+        assertThat(longUserMap.get(1L)).isEqualTo("User A");
+        assertThat(longUserMap.get(2L)).isEqualTo("User B");
+                
+        // Test if map is immutable
+        try {
+            longUserMap.put(3L, "User C");
+        } catch (UnsupportedOperationException e) {
+            assertThat(e).isInstanceOf(UnsupportedOperationException.class);
+        }
+    }
+}