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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.utils.btree;
  
  import java.util.AbstractMap;
  import java.util.Arrays;
  import java.util.Collection;
  import java.util.Map;
  import java.util.Set;
  
  import com.google.common.collect.testing.*;
  import com.google.common.collect.testing.features.CollectionSize;
  import com.google.common.collect.testing.testers.MapEntrySetTester;
  
  import junit.framework.Test; // checkstyle: permit this import
  import junit.framework.TestSuite; // checkstyle: permit this import
  
  import static com.google.common.collect.testing.Helpers.getMethod;
  
  public class BTreeMapGuavaTest
  {
      public static Test suite()
      {
          return new BTreeMapGuavaTest().allTests();
      }
  
      public Test allTests()
      {
          TestSuite suite = new TestSuite("btree map tests");
          // todo; add a mutable wrapper and run the full map tests
          // todo; add a navigable wrapper and run the full navigable map tests
          suite.addTest(testsForUnmodifiableMap());
          return suite;
      }
  
      public Test testsForUnmodifiableMap() {
          return MapTestSuiteBuilder.using(
                                    new TestStringMapGenerator() {
                                        @Override
                                        protected Map<String, String> create(Map.Entry<String, String>[] entries)
                                        {
                                            return populate(entries);
                                        }
                                    })
                                    .named("unmodifiableMap/BTreeMap")
                                    .withFeatures(
                                    CollectionSize.ANY)
                                    .suppressing(Arrays.asList(getMethod(MapEntrySetTester.class, "testContainsEntryWithIncomparableValue")))
                                    .createTestSuite();
      }
  
      private static Map<String, String> populate(Map.Entry<String, String>[] entries)
      {
          BTreeMap<String, String> map = BTreeMap.empty();
          for (Map.Entry<String, String> entry : entries)
              map = map.withForce(entry.getKey(), entry.getValue());
          return new BTreeMapWrapper<>(map);
      }
  
      // BTreeSet toString / toArray / hashCode are non-standard, wrap them with the set from BTreeSetGuavaTest;
      private static class BTreeMapWrapper<K extends Comparable<K>, V> extends AbstractMap<K, V>
      {
          private final BTreeMap<K, V> map;
  
          public BTreeMapWrapper(BTreeMap<K, V> map)
          {
              this.map = map;
          }
  
          @Override
          public Set<Entry<K, V>> entrySet()
          {
              return new BTreeSetGuavaTest.BTreeSetWithClassicToArray<>((BTreeSet<Map.Entry<K, V>>)map.entrySet());
          }
  
          @Override
          public Set<K> keySet()
          {
              return new BTreeSetGuavaTest.BTreeSetWithClassicToArray<>((BTreeSet<K>)map.keySet());
          }
  
          public V get(K key)
          {
              return map.get(key);
          }
  
          public Collection<V> values()
          {
              return map.values();
          }
  
          public boolean containsValue(Object value)
          {
              return map.containsValue(value);
          }
  
          public boolean containsKey(Object key)
          {
              return map.containsKey(key);
          }
  
          public boolean isEmpty()
          {
              return map.isEmpty();
          }
  
          public int size()
          {
              return map.size();
          }
      }
  }
  