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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.cql3;
  
  import java.util.Set;
  import java.util.stream.Collectors;
  
  import com.google.common.collect.ImmutableSet;
  import com.google.common.collect.Sets;
  import org.junit.BeforeClass;
  import org.junit.Test;
  
  import org.apache.cassandra.auth.AuthKeyspace;
  import org.apache.cassandra.db.SystemKeyspace;
  import org.apache.cassandra.schema.KeyspaceMetadata;
  import org.apache.cassandra.schema.Schema;
  import org.apache.cassandra.schema.SchemaConstants;
  import org.apache.cassandra.schema.SchemaKeyspaceTables;
  import org.apache.cassandra.schema.SystemDistributedKeyspace;
  import org.apache.cassandra.tracing.TraceKeyspace;
  
  import static java.lang.String.format;
  import static org.junit.Assert.assertNotNull;
  import static org.junit.Assert.assertTrue;
  
  public class SystemKeyspaceTablesNamesTest extends CQLTester
  {
      @BeforeClass
      public static void setUp()
      {
          // Needed for distributed keyspaces
          requireNetwork();
      }
  
      @Test
      public void testSystemKeyspaceTableNames()
      {
          assertExpectedTablesInKeyspace(SchemaConstants.SYSTEM_KEYSPACE_NAME,
                                         "SystemKeyspace.TABLE_NAMES",
                                         SystemKeyspace.TABLE_NAMES);
      }
  
      @Test
      public void testSystemSchemaKeyspaceTableNames()
      {
          assertExpectedTablesInKeyspace(SchemaConstants.SCHEMA_KEYSPACE_NAME,
                                         "SchemaKeyspaceTables.ALL",
                                         ImmutableSet.copyOf(SchemaKeyspaceTables.ALL));
      }
  
      @Test
      public void testSystemTraceKeyspaceTableNames()
      {
          assertExpectedTablesInKeyspace(SchemaConstants.TRACE_KEYSPACE_NAME,
                                         "TraceKeyspace.TABLE_NAMES",
                                         TraceKeyspace.TABLE_NAMES);
      }
  
      @Test
      public void testSystemAuthKeyspaceTableNames()
      {
          assertExpectedTablesInKeyspace(SchemaConstants.AUTH_KEYSPACE_NAME,
                                         "AuthKeyspace.TABLE_NAMES",
                                         AuthKeyspace.TABLE_NAMES);
      }
  
      @Test
      public void testSystemDistributedKeyspaceTableNames()
      {
          assertExpectedTablesInKeyspace(SchemaConstants.DISTRIBUTED_KEYSPACE_NAME,
                                         "SystemDistributedKeyspace.TABLE_NAMES",
                                         SystemDistributedKeyspace.TABLE_NAMES);
      }
      
      private static void assertExpectedTablesInKeyspace(String keyspaceName, String expectedTableSource, Set<String> expectedTables)
      {
          KeyspaceMetadata keyspace = Schema.instance.getKeyspaceMetadata(keyspaceName);
          assertNotNull(keyspace);
          Set<String> actualKeyspaceTables = keyspace.tables.stream().map(t -> t.name).collect(Collectors.toSet());
  
          Sets.SetView<String> diff = Sets.difference(actualKeyspaceTables, expectedTables);
          assertTrue(format("The following tables are missing from %s: %s", expectedTableSource, diff), diff.isEmpty());
  
          diff = Sets.difference(expectedTables, actualKeyspaceTables);
          assertTrue(format("The following tables are in %s but should not be: %s", expectedTableSource,  diff), diff.isEmpty());
      }
  }
  