style: include UTAO_JUNIT_ASSERTION_ODDITIES_USE_ASSERT_NOT_NULL (#7226)

Author: vil02

spotbugs-exclude.xml

@@ -219,9 +219,6 @@
     <Match>
         <Bug pattern="UTAO_JUNIT_ASSERTION_ODDITIES_INEXACT_DOUBLE" />
     </Match>
-    <Match>
-        <Bug pattern="UTAO_JUNIT_ASSERTION_ODDITIES_USE_ASSERT_NOT_NULL" />
-    </Match>
     <Match>
         <Bug pattern="UTAO_JUNIT_ASSERTION_ODDITIES_IMPOSSIBLE_NULL" />
     </Match>

src/test/java/com/thealgorithms/datastructures/heaps/HeapElementTest.java

@@ -2,6 +2,7 @@
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertNotEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
 import static org.junit.jupiter.api.Assertions.assertNull;
 
 import org.junit.jupiter.api.Test;
@@ -39,7 +40,7 @@ void testEquals() {
 
         assertEquals(element1, element2); // Same key and info
         assertNotEquals(element1, element3); // Different key
-        assertNotEquals(null, element1); // Check for null
+        assertNotNull(element1);
         assertNotEquals("String", element1); // Check for different type
     }
 

src/test/java/com/thealgorithms/maths/LinearDiophantineEquationsSolverTest.java

@@ -176,7 +176,7 @@ void testSolutionEquality() {
         assertEquals(solution1, solution2);
         assertNotEquals(solution3, solution1);
         assertEquals(solution1, solution1);
-        assertNotEquals(null, solution1);
+        assertNotNull(solution1);
         assertNotEquals("string", solution1);
     }
 
@@ -217,7 +217,7 @@ void testGcdSolutionWrapperEquality() {
         assertEquals(wrapper1, wrapper2);
         assertNotEquals(wrapper3, wrapper1);
         assertEquals(wrapper1, wrapper1);
-        assertNotEquals(null, wrapper1);
+        assertNotNull(wrapper1);
         assertNotEquals("string", wrapper1);
     }