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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
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   */
  package org.apache.causeway.viewer.wicket.viewer.registries.pages;
  
  import org.junit.jupiter.api.Test;
  import org.mockito.Mockito;
  
  import static org.junit.jupiter.api.Assertions.assertThrows;
  
  import org.apache.causeway.viewer.wicket.ui.pages.PageClassList;
  
  class PageClassListDefault_Instantiation {
  
      @Test
      void shouldCauseAllPagesToBeRegistered() {
          // necessary to provide an implementation that will register
          // all pages with the registry.
          final PageClassListDefault pageClassList = new PageClassListDefault();
          newPageClassRegistryDefault(pageClassList);
      }
  
      @Test
      void shouldFailIfNoPagesRegistered() {
          // no side effects, ie doesn't register
          final PageClassList mockPageClassList = Mockito.mock(PageClassList.class);
          assertThrows(IllegalStateException.class, ()->{
              newPageClassRegistryDefault(mockPageClassList);
          });
      }
  
      // -- HELPER
  
      static PageClassRegistryDefault newPageClassRegistryDefault(final PageClassList pageClassList) {
          PageClassRegistryDefault pageClassRegistry = new PageClassRegistryDefault(pageClassList);
          pageClassRegistry.init();
          return pageClassRegistry;
      }
  
  }
  