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.causeway.core.metamodel.facets.object.layoutxml;
  
  import java.util.concurrent.atomic.AtomicReference;
  
  import org.junit.jupiter.api.Test;
  
  import static org.hamcrest.CoreMatchers.is;
  import static org.hamcrest.CoreMatchers.nullValue;
  import static org.hamcrest.MatcherAssert.assertThat;
  
  import org.apache.causeway.applib.layout.component.FieldSet;
  
  public class GridFacetDefaultTest {
  
      @Test
      public void xxx() throws Exception {
  
          final AtomicReference<FieldSet> x = new AtomicReference<>();
  
          FieldSet firstValue = new FieldSet();
          FieldSet otherValue = new FieldSet();
  
          assertThat(x.get(), is(nullValue()));
  
          boolean b = x.compareAndSet(null, firstValue);
          assertThat(b, is(true));
          assertThat(x.get(), is(firstValue));
  
          boolean b2 = x.compareAndSet(null, firstValue);
          assertThat(b2, is(false));
          assertThat(x.get(), is(firstValue));
  
          boolean b3 = x.compareAndSet(null, otherValue);
          assertThat(b3, is(false));
          assertThat(x.get(), is(firstValue));
  
          boolean b4 = x.compareAndSet(firstValue, otherValue);
          assertThat(b4, is(true));
          assertThat(x.get(), is(otherValue));
  
      }
  }