diff --git a/core-java-modules/core-java-uuid/src/test/java/com/baeldung/uuid/DecodeUUIDStringFromBase64Test.java b/core-java-modules/core-java-uuid/src/test/java/com/baeldung/uuid/DecodeUUIDStringFromBase64Test.java
index 043ec59fb5..c3bb715c83 100644
--- a/core-java-modules/core-java-uuid/src/test/java/com/baeldung/uuid/DecodeUUIDStringFromBase64Test.java
+++ b/core-java-modules/core-java-uuid/src/test/java/com/baeldung/uuid/DecodeUUIDStringFromBase64Test.java
@@ -15,16 +15,18 @@ public class DecodeUUIDStringFromBase64Test {
 
     @Test
     public void shouldDecodeUUIDUsingByteArrayAndBase64Decoder() {
+        String expectedEncodedString = "UUrxjPeTX8xsDDoxQOfGgw";
         byte[] decodedBytes = Base64.getDecoder()
-          .decode("UUrxjPeTX8xsDDoxQOfGgw");
+          .decode(expectedEncodedString);
         UUID uuid = convertToUUID(decodedBytes);
         assertEquals(originalUUID, uuid);
     }
 
     @Test
     public void shouldDecodeUUIDUsingByteBufferAndBase64UrlDecoder() {
+        String expectedEncodedString = "zF-T94zxSlGDxudAMToMbA";
         byte[] decodedBytes = Base64.getUrlDecoder()
-          .decode("zF-T94zxSlGDxudAMToMbA");
+          .decode(expectedEncodedString);
         ByteBuffer byteBuffer = ByteBuffer.wrap(decodedBytes);
         long mostSignificantBits = byteBuffer.getLong();
         long leastSignificantBits = byteBuffer.getLong();
@@ -34,7 +36,8 @@ public class DecodeUUIDStringFromBase64Test {
 
     @Test
     public void shouldDecodeUUIDUsingApacheUtils() {
-        byte[] decodedBytes = decodeBase64("UUrxjPeTX8xsDDoxQOfGgw");
+        String expectedEncodedString = "UUrxjPeTX8xsDDoxQOfGgw";
+        byte[] decodedBytes = decodeBase64(expectedEncodedString);
         UUID uuid = Conversion.byteArrayToUuid(decodedBytes, 0);
         assertEquals(originalUUID, uuid);
     }
diff --git a/core-java-modules/core-java-uuid/src/test/java/com/baeldung/uuid/EncodeUUIDToBase64StringTest.java b/core-java-modules/core-java-uuid/src/test/java/com/baeldung/uuid/EncodeUUIDToBase64StringTest.java
index cef80cdc24..19c220faf7 100644
--- a/core-java-modules/core-java-uuid/src/test/java/com/baeldung/uuid/EncodeUUIDToBase64StringTest.java
+++ b/core-java-modules/core-java-uuid/src/test/java/com/baeldung/uuid/EncodeUUIDToBase64StringTest.java
@@ -15,27 +15,30 @@ public class EncodeUUIDToBase64StringTest {
 
     @Test
     public void shouldEncodeUUIDUsingByteArrayAndBase64Encoder() {
+        String expectedEncodedString = "UUrxjPeTX8xsDDoxQOfGgw";
         byte[] uuidBytes = convertToByteArray(originalUUID);
         String encodedUUID = Base64.getEncoder().withoutPadding()
           .encodeToString(uuidBytes);
-        assertEquals("UUrxjPeTX8xsDDoxQOfGgw", encodedUUID);
+        assertEquals(expectedEncodedString, encodedUUID);
     }
 
     @Test
     public void shouldEncodeUUIDUsingByteBufferAndBase64UrlEncoder() {
+        String expectedEncodedString = "zF-T94zxSlGDxudAMToMbA";
         ByteBuffer byteBuffer = ByteBuffer.wrap(new byte[16]);
         byteBuffer.putLong(originalUUID.getMostSignificantBits());
         byteBuffer.putLong(originalUUID.getLeastSignificantBits());
         String encodedUUID = Base64.getUrlEncoder().withoutPadding()
           .encodeToString(byteBuffer.array());
-        assertEquals("zF-T94zxSlGDxudAMToMbA", encodedUUID);
+        assertEquals(expectedEncodedString, encodedUUID);
     }
 
     @Test
     public void shouldEncodeUUIDUsingApacheUtils() {
+        String expectedEncodedString = "UUrxjPeTX8xsDDoxQOfGgw";
         byte[] bytes = Conversion.uuidToByteArray(originalUUID, new byte[16], 0, 16);
         String encodedUUID = encodeBase64URLSafeString(bytes);
-        assertEquals("UUrxjPeTX8xsDDoxQOfGgw", encodedUUID);
+        assertEquals(expectedEncodedString, encodedUUID);
     }
 
     private byte[] convertToByteArray(UUID uuid) {