content: /*
   *  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.apache.causeway.applib.graph.tree;
  
  import java.util.List;
  
  import org.hamcrest.Matchers;
  import org.junit.jupiter.api.Test;
  
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.junit.jupiter.api.Assertions.assertEquals;
  
  import org.apache.causeway.commons.collections.Can;
  
  class TreePathTest {
  
      @Test
      void rootConstructor() {
          final TreePath treePath = TreePath.root();
          assertThat(treePath.isRoot(), Matchers.is(true));
          assertThat(treePath.toString(), Matchers.is("/0"));
      }
  
      @Test
      void samePathsShouldBeEqual() {
          final TreePath treePath1 = TreePath.of(0, 1, 2, 3);
          final TreePath treePath2 = TreePath.of(0, 1, 2, 3);
          assertEquals(treePath1, treePath2);
          assertEquals(treePath1.hashCode(), treePath2.hashCode());
          assertEquals(treePath1.isRoot(), treePath2.isRoot());
          assertEquals(treePath1.toString(), treePath2.toString());
  
          assertThat(treePath1.toString(), Matchers.is("/0/1/2/3"));
      }
  
      @Test
      void hierarchyStreamingOfRoot() {
          assertEquals(
                  Can.ofCollection(List.of("/0")),
                  TreePath.root()
                      .streamUpTheHierarchyStartingAtSelf()
                      .map(TreePath::toString)
                      .collect(Can.toCan()));
      }
  
      @Test
      void hierarchyStreamingOfNonRoot() {
          assertEquals(
                  Can.ofCollection(
                          List.of(
                                  "/0/1/2/3",
                                  "/0/1/2",
                                  "/0/1",
                                  "/0")),
                  TreePath.of(0, 1, 2, 3)
                      .streamUpTheHierarchyStartingAtSelf()
                      .map(TreePath::toString)
                      .collect(Can.toCan()));
      }
  
  }
  