diff --git a/testing-modules/testing-assertions/src/test/java/com/baeldung/assertnestedmap/AssertNestedMapUnitTest.java b/testing-modules/testing-assertions/src/test/java/com/baeldung/assertnestedmap/AssertNestedMapUnitTest.java
index ceef5efdd2..7c48a5eb4a 100644
--- a/testing-modules/testing-assertions/src/test/java/com/baeldung/assertnestedmap/AssertNestedMapUnitTest.java
+++ b/testing-modules/testing-assertions/src/test/java/com/baeldung/assertnestedmap/AssertNestedMapUnitTest.java
@@ -3,7 +3,6 @@ package com.baeldung.assertnestedmap;
 
 import org.junit.jupiter.api.Test;
 
-import java.util.HashMap;
 import java.util.Map;
 
 import static com.baeldung.assertnestedmap.matchers.NestedMapMatcher.hasNestedMapEntry;
@@ -14,22 +13,16 @@ import static org.junit.jupiter.api.Assertions.*;
 public class AssertNestedMapUnitTest {
     @Test
     void givenNestedMap_whenUseJupiterAssertTrueWithoutCasting_thenTest() {
-        Map<String, Object> innerMap = new HashMap<>();
-        innerMap.put("city", "Chicago");
-
-        Map<String, Map<String, Object>> outerMap = new HashMap<>();
-        outerMap.put("address", innerMap);
+        Map<String, Object> innerMap = Map.of("city", "Chicago");
+        Map<String, Map<String, Object>> outerMap = Map.of("address", innerMap);
 
         assertTrue(outerMap.containsKey("address") && outerMap.get("address").get("city").equals("Chicago"));
     }
 
     @Test
     void givenNestedMap_whenUseJupiterAssertAllAndAssertTrue_thenTest() {
-        Map<String, Object> innerMap = new HashMap<>();
-        innerMap.put("city", "Chicago");
-
-        Map<String, Map<String, Object>> outerMap = new HashMap<>();
-        outerMap.put("address", innerMap);
+        Map<String, Object> innerMap = Map.of("city", "Chicago");
+        Map<String, Map<String, Object>> outerMap = Map.of("address", innerMap);
 
         assertAll(
           () -> assertTrue(outerMap.containsKey("address")),
@@ -39,11 +32,8 @@ public class AssertNestedMapUnitTest {
 
     @Test
     void givenNestedMap_whenUseJupiterAssertTrueWithCasting_thenTest() {
-        Map<String, Object> innerMap = new HashMap<>();
-        innerMap.put("city", "Chicago");
-
-        Map<String, Object> outerMap = new HashMap<>();
-        outerMap.put("address", innerMap);
+        Map<String, Object> innerMap = Map.of("city", "Chicago");
+        Map<String, Object> outerMap = Map.of("address", innerMap);
 
         assertTrue(outerMap.containsKey("address")
                 && ((Map<String, Object>)outerMap.get("address")).get("city").equals("Chicago"));
@@ -51,12 +41,8 @@ public class AssertNestedMapUnitTest {
 
     @Test
     void givenNestedMap_whenUseHamcrestAssertThat_thenTest() {
-        Map<String, Object> innerMap = new HashMap<>();
-        innerMap.put("city", "Chicago");
-
-        Map<String, Map<String, Object>> outerMap = new HashMap<>();
-        outerMap.put("address", innerMap);
-
+        Map<String, Object> innerMap = Map.of("city", "Chicago");
+        Map<String, Map<String, Object>> outerMap = Map.of("address", innerMap);
         assertAll(
           () -> assertThat(outerMap, hasKey("address")),
           () -> assertThat(outerMap.get("address"), hasEntry("city", "Chicago"))
@@ -65,46 +51,42 @@ public class AssertNestedMapUnitTest {
 
     @Test
     void givenNestedMapOfStringAndObject_whenUseHamcrestAssertThat_thenTest() {
-        Map<String, Object> innerMap = new HashMap<>();
-        innerMap.put("city", "Chicago");
-
-        Map<String, Map<String, Object>> outerMap = new HashMap<>();
-        outerMap.put("address", innerMap);
+        Map<String, Object> innerMap = Map.of("city", "Chicago");
+        Map<String, Map<String, Object>> outerMap = Map.of("address", innerMap);
 
         assertThat(outerMap, hasEntry(equalTo("address"), hasEntry("city", "Chicago")));
     }
 
     @Test
     void givenNestedMapOfStringAndObject_whenUseHamcrestAssertThatAndCustomMatcher_thenTest() {
-        Map<String, Object> innerMap = new HashMap<>();
-        innerMap.put("city", "Chicago");
-        innerMap.put("zip", "10005");
-
-        Map<String, Map<String, Object>> outerMap = new HashMap<>();
-        outerMap.put("address", innerMap);
+        Map<String, Object> innerMap = Map.of
+          (
+            "city", "Chicago",
+            "zip", "10005"
+          );
+        Map<String, Map<String, Object>> outerMap = Map.of("address", innerMap);
 
         assertThat(outerMap, hasNestedMapEntry("address", innerMap));
     }
 
     @Test
     void givenOuterMapOfStringAndObjectAndInnerMap_whenUseHamcrestAssertThatAndCustomMatcher_thenTest() {
-        Map<String, Object> innerMap = new HashMap<>();
-        innerMap.put("city", "Chicago");
-        innerMap.put("zip", "10005");
-
-        Map<String, Object> outerMap = new HashMap<>();
-        outerMap.put("address", innerMap);
+        Map<String, Object> innerMap = Map.of
+          (
+            "city", "Chicago",
+            "zip", "10005"
+          );
+        Map<String, Object> outerMap = Map.of("address", innerMap);
 
         assertThat(outerMap, hasNestedMapEntry("address", innerMap));
     }
 
     @Test
     void givenNestedMap_whenUseHamcrestAssertThatWithCasting_thenTest() {
-        Map<String, Object> innerMap = new HashMap<>();
-        innerMap.put("city", "Chicago");
-        Map<String, Object> outerMap = new HashMap<>();
-        outerMap.put("address", innerMap);
+        Map<String, Object> innerMap = Map.of("city", "Chicago");
+        Map<String, Object> outerMap = Map.of("address", innerMap);
 
         assertThat((Map<String, Object>)outerMap.get("address"), hasEntry("city", "Chicago"));
     }
+
 }