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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.cassandra.config;
  
  import java.util.List;
  import java.util.Map;
  
  import org.junit.Test;
  
  import org.apache.cassandra.auth.AllowAllAuthorizer;
  import org.apache.cassandra.auth.IAuthorizer;
  import org.apache.cassandra.exceptions.ConfigurationException;
  
  import static org.assertj.core.api.Assertions.assertThatThrownBy;
  import static org.junit.Assert.assertNotNull;
  import static org.junit.Assert.assertNull;
  
  public class ParameterizedClassTest
  {
      @Test
      public void testParameterizedClassEmptyConstructorHasNullParameters()
      {
          ParameterizedClass parameterizedClass = new ParameterizedClass();
          assertNull(parameterizedClass.parameters);
      }
  
      @Test
      public void testParameterizedClassConstructorWithClassNameHasNonNullParameters()
      {
          ParameterizedClass parameterizedClass = new ParameterizedClass("TestClass");
          assertNotNull(parameterizedClass.parameters);
      }
  
      @Test
      public void testParameterizedClassConstructorWithClassNameAndParametersHasNullParamters()
      {
          ParameterizedClass parameterizedClass = new ParameterizedClass("TestClass", null);
          assertNull(parameterizedClass.parameters);
      }
  
      @Test
      public void testNewInstanceWithNonExistentClassFailsWithConfigurationException()
      {
          assertThatThrownBy(() -> ParameterizedClass.newInstance(new ParameterizedClass("NonExistentClass"),
                                                                  List.of("org.apache.cassandra.config")))
          .hasMessage("Unable to find class NonExistentClass in packages [\"org.apache.cassandra.config\"]")
          .isInstanceOf(ConfigurationException.class);
      }
  
      @Test
      public void testNewInstanceWithSingleEmptyConstructorUsesEmptyConstructor()
      {
          ParameterizedClass parameterizedClass = new ParameterizedClass(AllowAllAuthorizer.class.getName());
          IAuthorizer instance = ParameterizedClass.newInstance(parameterizedClass, null);
          assertNotNull(instance);
      }
  
      @Test
      public void testNewInstanceWithValidConstructorsFavorsMapConstructor()
      {
          ParameterizedClass parameterizedClass = new ParameterizedClass(ParameterizedClassExample.class.getName());
          ParameterizedClassExample instance = ParameterizedClass.newInstance(parameterizedClass, null);
          assertNotNull(instance);
      }
  
      @Test
      public void testNewInstanceWithValidConstructorsUsingNullParamtersFavorsMapConstructor()
      {
          ParameterizedClass parameterizedClass = new ParameterizedClass(ParameterizedClassExample.class.getName());
          parameterizedClass.parameters = null;
  
          ParameterizedClassExample instance = ParameterizedClass.newInstance(parameterizedClass, null);
          assertNotNull(instance);
      }
  
      @Test
      public void testNewInstanceWithConstructorExceptionPreservesOriginalFailure()
      {
          assertThatThrownBy(() -> ParameterizedClass.newInstance(new ParameterizedClass(ParameterizedClassExample.class.getName(),
                                                                                         Map.of("fail", "true")), null))
          .hasMessageStartingWith("Failed to instantiate class")
          .hasMessageContaining("Simulated failure")
          .isInstanceOf(ConfigurationException.class);
      }
  }
  