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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.
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  package org.apache.cassandra.cql3.validation.operations;
  
  import org.assertj.core.api.Assertions;
  import org.junit.Test;
  
  import org.apache.cassandra.config.DatabaseDescriptor;
  import org.apache.cassandra.cql3.CQLTester;
  import org.apache.cassandra.cql3.QueryProcessor;
  import org.apache.cassandra.exceptions.InvalidRequestException;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.fail;
  
  public class UseTest extends CQLTester
  {
      @Test
      public void testUseStatementWithBindVariable() throws Throwable
      {
          DatabaseDescriptor.setUseStatementsEnabled(true);
          assertInvalidSyntaxMessage("Bind variables cannot be used for keyspace names", "USE ?");
      }
  
      @Test
      public void shouldRejectUseStatementWhenProhibited() throws Throwable
      {
          long useCountBefore = QueryProcessor.metrics.useStatementsExecuted.getCount();
  
          try
          {
              DatabaseDescriptor.setUseStatementsEnabled(false);
              execute("USE cql_test_keyspace");
              fail("expected USE statement to fail with use_statements_enabled = false");
          }
          catch (InvalidRequestException e)
          {
              assertEquals(useCountBefore, QueryProcessor.metrics.useStatementsExecuted.getCount());
              Assertions.assertThat(e).hasMessageContaining("USE statements prohibited");
          }
      }
  }
  