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    * 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.
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  package org.eclipse.aether.util.graph.visitor;
  
  import java.util.List;
  
  import org.eclipse.aether.graph.DependencyFilter;
  import org.eclipse.aether.graph.DependencyNode;
  import org.eclipse.aether.internal.test.util.DependencyGraphParser;
  import org.junit.jupiter.api.Test;
  
  import static java.util.Objects.requireNonNull;
  import static org.junit.jupiter.api.Assertions.*;
  
  public class PathRecordingDependencyVisitorTest {
  
      private DependencyNode parse(String resource) throws Exception {
          return new DependencyGraphParser("visitor/path-recorder/").parseResource(resource);
      }
  
      private void assertPath(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 testGetPaths_RecordsMatchesBeneathUnmatchedParents() throws Exception {
          DependencyNode root = parse("simple.txt");
  
          PathRecordingDependencyVisitor visitor = new PathRecordingDependencyVisitor(new ArtifactMatcher());
          root.accept(visitor);
  
          List<List<DependencyNode>> paths = visitor.getPaths();
          assertEquals(2, paths.size(), paths.toString());
          assertPath(paths.get(0), "a", "b", "x");
          assertPath(paths.get(1), "a", "x");
      }
  
      @Test
      void testGetPaths_DoesNotRecordMatchesBeneathMatchedParents() throws Exception {
          DependencyNode root = parse("nested.txt");
  
          PathRecordingDependencyVisitor visitor = new PathRecordingDependencyVisitor(new ArtifactMatcher());
          root.accept(visitor);
  
          List<List<DependencyNode>> paths = visitor.getPaths();
          assertEquals(1, paths.size(), paths.toString());
          assertPath(paths.get(0), "x");
      }
  
      @Test
      void testGetPaths_RecordsMatchesBeneathMatchedParentsIfRequested() throws Exception {
          DependencyNode root = parse("nested.txt");
  
          PathRecordingDependencyVisitor visitor = new PathRecordingDependencyVisitor(new ArtifactMatcher(), false);
          root.accept(visitor);
  
          List<List<DependencyNode>> paths = visitor.getPaths();
          assertEquals(3, paths.size(), paths.toString());
          assertPath(paths.get(0), "x");
          assertPath(paths.get(1), "x", "a", "y");
          assertPath(paths.get(2), "x", "y");
      }
  
      @Test
      void testFilterCalledWithProperParentStack() throws Exception {
          DependencyNode root = parse("parents.txt");
  
          final StringBuilder buffer = new StringBuilder(256);
          DependencyFilter filter = new DependencyFilter() {
              public boolean accept(DependencyNode node, List<DependencyNode> parents) {
                  requireNonNull(node, "node cannot be null");
                  requireNonNull(parents, "parents cannot be null");
                  for (DependencyNode parent : parents) {
                      buffer.append(parent.getDependency().getArtifact().getArtifactId());
                  }
                  buffer.append(",");
                  return false;
              }
          };
 
         PathRecordingDependencyVisitor visitor = new PathRecordingDependencyVisitor(filter);
         root.accept(visitor);
 
         assertEquals(",a,ba,cba,a,ea,", buffer.toString());
     }
 
     @Test
     void testGetPaths_HandlesCycles() throws Exception {
         DependencyNode root = parse("cycle.txt");
 
         PathRecordingDependencyVisitor visitor = new PathRecordingDependencyVisitor(new ArtifactMatcher(), false);
         root.accept(visitor);
 
         List<List<DependencyNode>> paths = visitor.getPaths();
         assertEquals(4, paths.size(), paths.toString());
         assertPath(paths.get(0), "a", "b", "x");
         assertPath(paths.get(1), "a", "x");
         assertPath(paths.get(2), "a", "x", "b", "x");
         assertPath(paths.get(3), "a", "x", "x");
     }
 
     @Test
     void testGetPaths_HandlesCycles_threePaths() throws Exception {
         DependencyNode root = parse("cycle-3paths.txt");
 
         PathRecordingDependencyVisitor visitor = new PathRecordingDependencyVisitor(new ArtifactMatcher());
         root.accept(visitor);
 
         List<List<DependencyNode>> paths = visitor.getPaths();
         assertEquals(1, paths.size(), paths.toString());
         assertPath(paths.get(0), "a", "b");
     }
 
     private static class ArtifactMatcher implements DependencyFilter {
         public boolean accept(DependencyNode node, List<DependencyNode> parents) {
             return node.getDependency() != null
                     && node.getDependency().getArtifact().getGroupId().equals("match");
         }
     }
 }