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.utils;
  
  import java.util.List;
  import java.util.Objects;
  import java.util.Random;
  
  import com.google.common.net.InternetDomainName;
  import org.junit.Test;
  
  import accord.utils.Property;
  import org.apache.cassandra.db.marshal.AsciiType;
  import org.assertj.core.api.Assertions;
  import org.quicktheories.core.Gen;
  import org.quicktheories.generators.SourceDSL;
  import org.quicktheories.impl.JavaRandom;
  
  import static org.apache.cassandra.utils.AbstractTypeGenerators.stringComparator;
  import static org.quicktheories.QuickTheory.qt;
  
  public class GeneratorsTest
  {
      @Test
      public void randomUUID()
      {
          qt().forAll(Generators.UUID_RANDOM_GEN).checkAssert(uuid -> {
              Assertions.assertThat(uuid.version())
                        .as("version was not random uuid")
                        .isEqualTo(4);
              Assertions.assertThat(uuid.variant())
                        .as("varient not set to IETF (2)")
                        .isEqualTo(2);
          });
      }
  
      @Test
      public void dnsDomainName()
      {
          qt().forAll(Generators.DNS_DOMAIN_NAME).checkAssert(InternetDomainName::from);
      }
  
      @Test
      public void asciiDeterministic()
      {
          AbstractTypeGenerators.TypeSupport<String> support = AbstractTypeGenerators.TypeSupport.of(AsciiType.instance, SourceDSL.strings().ascii().ofLengthBetween(1, 10), stringComparator(AsciiType.instance));
          int samples = 100;
          int attempts = 100;
          Property.qt().check(rs -> checkDeterministicGeneration(attempts, samples, rs.nextLong(), support.valueGen));
          Property.qt().check(rs -> checkDeterministicGeneration(attempts, samples, rs.nextLong(), support.bytesGen()));
      }
  
      @Test
      public void asciiThereAndBackAgain()
      {
          qt().forAll(SourceDSL.strings().ascii().ofLengthBetween(1, 100)).checkAssert(ascii -> {
              String accum = ascii;
              for (int i = 0; i < 100; i++)
                  accum = AsciiType.instance.compose(AsciiType.instance.decompose(accum));
              Assertions.assertThat(accum).isEqualTo(ascii);
          });
      }
  
      private static <T> void checkDeterministicGeneration(int attempts, int samples, long seed, Gen<T> gen)
      {
          List<T> goldSet = null;
          for (int i = 0; i < attempts; i++)
          {
              JavaRandom qt = new JavaRandom(new Random(seed));
              List<T> sample = SourceDSL.lists().of(gen).ofSize(samples).generate(qt);
              if (goldSet == null)
              {
                  goldSet = sample;
                  continue;
              }
              if (!Objects.equals(sample, goldSet))
                  throw new AssertionError("seed=" + seed);
          }
      }
  }
  