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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.
   */
  package org.apache.causeway.commons.internal.collections;
  
  import java.util.HashMap;
  
  import org.junit.jupiter.api.Test;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertNull;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  import org.apache.causeway.commons.collections.Can;
  
  class _MapsTest {
      
      @Test
      void aliasMap_shouldAllowLookupByAliasKey() {
          
          var aliasMap = _Maps.<String, String>newAliasMap(HashMap::new);
          
          aliasMap.put("key1", "value1");
          aliasMap.put("key2", Can.ofArray(new String[] {"alias2a", "alias2b"}), "value2");
          aliasMap.put("key3", Can.empty(), "value3");
          
          assertTrue(aliasMap.containsKey("key1"));
          assertEquals("value1", aliasMap.get("key1"));
  
          assertTrue(aliasMap.containsKey("key2"));
          assertEquals("value2", aliasMap.get("key2"));
          assertEquals("value2", aliasMap.get("alias2a"));
          assertEquals("value2", aliasMap.get("alias2b"));
          
          assertTrue(aliasMap.containsKey("key3"));
          assertEquals("value3", aliasMap.get("key3"));
          
      }
      
      @Test
      void aliasMap_shouldAlsoClearAliases() {
          
          var aliasMap = _Maps.<String, String>newAliasMap(HashMap::new);
          
          aliasMap.put("key1", "value1");
          aliasMap.put("key2", Can.ofArray(new String[] {"alias2a", "alias2b"}), "value2");
          aliasMap.put("key3", Can.empty(), "value3");
          
          aliasMap.clear();
          
          assertFalse(aliasMap.containsKey("key1"));
          assertNull(aliasMap.get("key1"));
          
          assertFalse(aliasMap.containsKey("key2"));
          assertNull(aliasMap.get("key2"));
          assertNull(aliasMap.get("alias2a"));
          assertNull(aliasMap.get("alias2b"));
          
          assertFalse(aliasMap.containsKey("key3"));
          assertNull(aliasMap.get("key3"));
          
      }
      
      @Test
      void aliasMap_shouldHonorRemoval() {
          
          var aliasMap = _Maps.<String, String>newAliasMap(HashMap::new);
          
          aliasMap.put("key1", "value1");
          aliasMap.put("key2", Can.ofArray(new String[] {"alias2a", "alias2b"}), "value2");
          aliasMap.put("key3", Can.empty(), "value3");
          
          aliasMap.remove("key1");
          aliasMap.remove("key2");
          aliasMap.remove("key3");
          
          assertFalse(aliasMap.containsKey("key1"));
          assertNull(aliasMap.get("key1"));
          
          assertFalse(aliasMap.containsKey("key2"));
          assertNull(aliasMap.get("key2"));
          assertNull(aliasMap.get("alias2a"));
          assertNull(aliasMap.get("alias2b"));
          
          assertFalse(aliasMap.containsKey("key3"));
          assertNull(aliasMap.get("key3"));
          
          // re-adding previously removed should not throw
          aliasMap.put("key2", Can.ofArray(new String[] {"alias2a", "alias2b"}), "value2");
          
      }
      
      @Test
      void aliasMap_shouldThrowOnAliasKeyCollision() {
          
          var aliasMap = _Maps.<String, String>newAliasMap(HashMap::new);
          
          aliasMap.put("key1", Can.ofArray(new String[] {"alias1a", "alias1b"}), "value1");
          
          assertThrows(IllegalArgumentException.class, ()->{
              aliasMap.put("key2", Can.ofArray(new String[] {"alias1a"}), "value2");
          });
          
      }
      
  }
  