update 543 test

Author: fishercoder1534

Diff for: src/test/java/com/fishercoder/_543Test.java

@@ -3,19 +3,19 @@
 import com.fishercoder.common.classes.TreeNode;
 import com.fishercoder.common.utils.TreeUtils;
 import com.fishercoder.solutions._543;
-import org.junit.BeforeClass;
-import org.junit.Test;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 
 import java.util.Arrays;
 
-import static junit.framework.TestCase.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
 
 public class _543Test {
     private static _543.Solution1 solution1;
     private static TreeNode root;
 
-    @BeforeClass
-    public static void setup() {
+    @BeforeEach
+    public void setup() {
         solution1 = new _543.Solution1();
     }