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.cassandra.sidecar.client;
  
  import java.util.Collections;
  import java.util.List;
  
  import org.junit.jupiter.api.Test;
  
  import static org.assertj.core.api.Assertions.assertThat;
  import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
  import static org.assertj.core.api.Assertions.assertThatIllegalArgumentException;
  
  /**
   * Test for the {@link SimpleSidecarInstancesProvider} class
   */
  class SimpleSidecarInstancesProviderTest
  {
      @Test
      void testConstructionFailsWhenInstancesAreNull()
      {
          assertThatIllegalArgumentException()
          .isThrownBy(() -> new SimpleSidecarInstancesProvider(null))
          .withMessage("The instances parameter must be non-null and must contain at least one element");
      }
  
      @Test
      void testConstructionFailsWhenInstancesAreEmpty()
      {
          assertThatIllegalArgumentException()
          .isThrownBy(() -> new SimpleSidecarInstancesProvider(Collections.emptyList()))
          .withMessage("The instances parameter must be non-null and must contain at least one element");
      }
  
      @Test
      void testInstancesAreCopiedDuringConstruction()
      {
          List<SidecarInstanceImpl> instances = Collections.singletonList(new SidecarInstanceImpl("localhost", 9043));
          SidecarInstancesProvider instancesProvider = new SimpleSidecarInstancesProvider(instances);
          assertThat(instancesProvider.instances()).isNotSameAs(instances);
      }
  
      @Test
      void testProviderInstancesAreImmutable()
      {
          List<SidecarInstanceImpl> instances = Collections.singletonList(new SidecarInstanceImpl("localhost", 9043));
          SidecarInstancesProvider instancesProvider = new SimpleSidecarInstancesProvider(instances);
          assertThatExceptionOfType(UnsupportedOperationException.class)
          .isThrownBy(() -> instancesProvider.instances().add(new SidecarInstanceImpl("bad", 80)));
      }
  }
  