chore: remove redundant test

Author: sozelfist

src/test/java/com/thealgorithms/datastructures/trees/SplayTreeTest.java

@@ -8,7 +8,6 @@
 import java.util.Arrays;
 import java.util.List;
 import java.util.stream.Stream;
-import org.junit.jupiter.api.Test;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.MethodSource;
 
@@ -111,17 +110,4 @@ private SplayTree createComplexTree() {
 
         return tree;
     }
-
-    @Test
-    public void testZigZagCaseWithNullChild() {
-        SplayTree tree = new SplayTree();
-        tree.insert(30);
-        tree.insert(10);
-        tree.insert(20);
-        tree.insert(15);
-
-        assertTrue(tree.search(15));
-
-        assertEquals(Arrays.asList(10, 15, 20, 30), tree.traverse(SplayTree.IN_ORDER));
-    }
 }