CloneGraphTest.java

import org.example.helpers.graph.Node;
import org.example.problems.clone_graph.Solution;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.Arguments;
import org.junit.jupiter.params.provider.MethodSource;

import java.util.stream.Stream;

public class CloneGraphTest {
 private static Stream<Arguments> provideCases() {
 return Stream.of(
 Arguments.of(Node.createFromArray(new int[][]{{2, 4}, {1, 3}, {2, 4}, {1, 3}})),
 Arguments.of(Node.createFromArray(new int[][]{{}})),
 Arguments.of(Node.createFromArray(new int[][]{}))
 );
 }

 @ParameterizedTest
 @MethodSource("provideCases")
 public void test(Node node) {
 Solution s = new Solution();
 Assertions.assertEquals(node, s.cloneGraph(node));
 if (node != null) {
 Assertions.assertNotSame(node, s.cloneGraph(node));
 }
 }
}