code: /*
   * Copyright (c) 2016-present, RxJava Contributors.
   *
   * Licensed 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 io.reactivex.rxjava3.internal.util;
  
  import static org.junit.Assert.*;
  
  import org.junit.Test;
  
  import io.reactivex.rxjava3.core.RxJavaTest;
  
  public class OpenHashSetTest extends RxJavaTest {
  
      static class Value {
  
          @Override
          public int hashCode() {
              return 1;
          }
  
          @Override
          public boolean equals(Object o) {
              return this == o;
          }
      }
  
      @Test
      public void addRemoveCollision() {
          Value v1 = new Value();
          Value v2 = new Value();
  
          OpenHashSet<Value> set = new OpenHashSet<>();
  
          assertTrue(set.add(v1));
  
          assertFalse(set.add(v1));
  
          assertFalse(set.remove(v2));
  
          assertTrue(set.add(v2));
  
          assertFalse(set.add(v2));
  
          assertTrue(set.remove(v2));
  
          assertFalse(set.remove(v2));
      }
  }
  