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
   *
   *      https://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.cayenne.di.spi;
  
  import org.apache.cayenne.di.DIRuntimeException;
  import org.junit.Test;
  
  import java.util.List;
  
  import static java.util.Arrays.asList;
  import static org.junit.Assert.assertEquals;
  
  public class DIGraphTest {
  
      @Test
      public void testTopSortNoCycles() {
          DIGraph<String> graph = new DIGraph<>();
          graph.add("x", "y");
          graph.add("x", "z");
          graph.add("z", "a");
  
          List<String> sorted = graph.topSort();
          assertEquals(asList("y", "a", "z", "x"), sorted);
      }
  
      @Test(expected = DIRuntimeException.class)
      public void testTopSortDirectCycle() {
          DIGraph<String> graph = new DIGraph<>();
          graph.add("x", "y");
          graph.add("y", "x");
          graph.topSort();
      }
  
      @Test
      public void testTopSortDirectCycleOverride() {
          DIGraph<String> graph = new DIGraph<>();
          graph.addWithOverride("x", "y");
          graph.addWithOverride("y", "x");
          List<String> sorted = graph.topSort();
          assertEquals(asList("x", "y"), sorted);
      }
  
      @Test(expected = DIRuntimeException.class)
      public void testTopSortInDirectCycle() {
          DIGraph<String> graph = new DIGraph<>();
          graph.add("x", "y");
          graph.add("y", "z");
          graph.add("z", "x");
          graph.topSort();
      }
  }
  