From f3e6301007f6453c46cba4c0bb9d89d0450f04ac Mon Sep 17 00:00:00 2001
From: vil02 <65706193+vil02@users.noreply.github.com>
Date: Tue, 20 Jan 2026 21:50:18 +0100
Subject: [PATCH] style: include
 `UTAO_JUNIT_ASSERTION_ODDITIES_USE_ASSERT_NULL`

---
 spotbugs-exclude.xml                                   |  3 ---
 .../thealgorithms/ciphers/PermutationCipherTest.java   |  5 +++--
 .../thealgorithms/datastructures/trees/TreapTest.java  |  3 ++-
 .../LongestCommonSubsequenceTest.java                  | 10 ++++------
 4 files changed, 9 insertions(+), 12 deletions(-)

diff --git a/spotbugs-exclude.xml b/spotbugs-exclude.xml
index 9269e3a87e88..f89bad8bebaf 100644
--- a/spotbugs-exclude.xml
+++ b/spotbugs-exclude.xml
@@ -222,9 +222,6 @@
     <Match>
         <Bug pattern="UTAO_JUNIT_ASSERTION_ODDITIES_USE_ASSERT_NOT_NULL" />
     </Match>
-    <Match>
-        <Bug pattern="UTAO_JUNIT_ASSERTION_ODDITIES_USE_ASSERT_NULL" />
-    </Match>
     <Match>
         <Bug pattern="UTAO_JUNIT_ASSERTION_ODDITIES_IMPOSSIBLE_NULL" />
     </Match>
diff --git a/src/test/java/com/thealgorithms/ciphers/PermutationCipherTest.java b/src/test/java/com/thealgorithms/ciphers/PermutationCipherTest.java
index 4ba6787cc97e..ecb7455c1ba2 100644
--- a/src/test/java/com/thealgorithms/ciphers/PermutationCipherTest.java
+++ b/src/test/java/com/thealgorithms/ciphers/PermutationCipherTest.java
@@ -1,6 +1,7 @@
 package com.thealgorithms.ciphers;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNull;
 import static org.junit.jupiter.api.Assertions.assertThrows;
 
 import org.junit.jupiter.api.Test;
@@ -121,8 +122,8 @@ void testNullString() {
         String decrypted = cipher.decrypt(encrypted, key);
 
         // then
-        assertEquals(null, encrypted);
-        assertEquals(null, decrypted);
+        assertNull(encrypted);
+        assertNull(decrypted);
     }
 
     @Test
diff --git a/src/test/java/com/thealgorithms/datastructures/trees/TreapTest.java b/src/test/java/com/thealgorithms/datastructures/trees/TreapTest.java
index 09ada594faca..52b74a7a1faf 100644
--- a/src/test/java/com/thealgorithms/datastructures/trees/TreapTest.java
+++ b/src/test/java/com/thealgorithms/datastructures/trees/TreapTest.java
@@ -2,6 +2,7 @@
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNull;
 
 import org.junit.jupiter.api.Test;
 
@@ -30,7 +31,7 @@ public void searchAndNotFound() {
         treap.insert(3);
         treap.insert(8);
         treap.insert(1);
-        assertEquals(null, treap.search(4));
+        assertNull(treap.search(4));
     }
 
     @Test
diff --git a/src/test/java/com/thealgorithms/dynamicprogramming/LongestCommonSubsequenceTest.java b/src/test/java/com/thealgorithms/dynamicprogramming/LongestCommonSubsequenceTest.java
index 40bbdff15ca6..91169c4cc9d8 100644
--- a/src/test/java/com/thealgorithms/dynamicprogramming/LongestCommonSubsequenceTest.java
+++ b/src/test/java/com/thealgorithms/dynamicprogramming/LongestCommonSubsequenceTest.java
@@ -1,6 +1,7 @@
 package com.thealgorithms.dynamicprogramming;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNull;
 
 import org.junit.jupiter.api.Test;
 
@@ -55,27 +56,24 @@ public void testLCSWithBothEmptyStrings() {
     public void testLCSWithNullFirstString() {
         String str1 = null;
         String str2 = "XYZ";
-        String expected = null; // Should return null if first string is null
         String result = LongestCommonSubsequence.getLCS(str1, str2);
-        assertEquals(expected, result);
+        assertNull(result);
     }
 
     @Test
     public void testLCSWithNullSecondString() {
         String str1 = "ABC";
         String str2 = null;
-        String expected = null; // Should return null if second string is null
         String result = LongestCommonSubsequence.getLCS(str1, str2);
-        assertEquals(expected, result);
+        assertNull(result);
     }
 
     @Test
     public void testLCSWithNullBothStrings() {
         String str1 = null;
         String str2 = null;
-        String expected = null; // Should return null if both strings are null
         String result = LongestCommonSubsequence.getLCS(str1, str2);
-        assertEquals(expected, result);
+        assertNull(result);
     }
 
     @Test