/*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you under the Apache License, Version 2.0 (the
    * "License"); you may not use this file except in compliance
    * with the License.  You may obtain a copy of the License at
    *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  package org.eclipse.aether.util.graph.visitor;
  
  import java.util.List;
  
  import org.eclipse.aether.graph.DependencyNode;
  import org.eclipse.aether.internal.test.util.DependencyGraphParser;
  import org.junit.jupiter.api.Test;
  
  import static org.junit.jupiter.api.Assertions.*;
  
  public class PostorderNodeListGeneratorTest {
  
      private DependencyNode parse(String resource) throws Exception {
          return new DependencyGraphParser("visitor/ordered-list/").parseResource(resource);
      }
  
      private void assertSequence(List<DependencyNode> actual, String... expected) {
          assertEquals(expected.length, actual.size(), actual.toString());
          for (int i = 0; i < expected.length; i++) {
              DependencyNode node = actual.get(i);
              assertEquals(expected[i], node.getDependency().getArtifact().getArtifactId(), actual.toString());
          }
      }
  
      @Test
      void testOrdering() throws Exception {
          DependencyNode root = parse("simple.txt");
  
          PostorderNodeListGenerator visitor = new PostorderNodeListGenerator();
          root.accept(visitor);
  
          assertSequence(visitor.getNodes(), "c", "b", "e", "d", "a");
      }
  
      @Test
      void testDuplicateSuppression() throws Exception {
          DependencyNode root = parse("cycles.txt");
  
          PostorderNodeListGenerator visitor = new PostorderNodeListGenerator();
          root.accept(visitor);
  
          assertSequence(visitor.getNodes(), "c", "b", "e", "d", "a");
      }
  }