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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.
   */
  package org.apache.causeway.core.metamodel.consent;
  
  import org.junit.jupiter.api.Test;
  import org.mockito.Mockito;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertThrowsExactly;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  import org.apache.causeway.applib.services.wrapper.events.InteractionEvent;
  import org.apache.causeway.core.metamodel.consent.Consent.VetoReason;
  
  class InteractionResultTest {
  
      private InteractionResult.Builder builder = InteractionResult.builder(Mockito.mock(InteractionEvent.class));
  
      @Test
      void shouldHaveNullReasonWhenJustInstantiated() {
          var result = builder.build();
          assertEquals(null, extractReason(result));
      }
  
      @Test
      void shouldBeEmptyWhenJustInstantiated() {
          var result = builder.build();
          assertFalse(result.isVetoing());
          assertTrue(result.isAllowing());
      }
  
      @Test
      void shouldHaveNonNullReasonWhenAdvisedWithNonNull() {
          advise(vetoReason("foo"), InteractionAdvisor.forTesting());
          var result = builder.build();
          assertEquals("foo", extractReason(result));
      }
  
      @Test
      void shouldConcatenateAdviseWhenAdvisedWithNonNull() {
          advise(vetoReason("foo"), InteractionAdvisor.forTesting());
          advise(vetoReason("bar"), InteractionAdvisor.forTesting());
          var result = builder.build();
          assertEquals("foo; bar", extractReason(result));
      }
  
      @Test
      void shouldNotBeEmptyWhenAdvisedWithNonNull() {
          advise(vetoReason("foo"), InteractionAdvisor.forTesting());
          var result = builder.build();
          assertTrue(result.isVetoing());
          assertFalse(result.isAllowing());
      }
  
      @Test
      void shouldThrowWhenAdvisedWithNull() {
          assertThrowsExactly(NullPointerException.class, ()->advise(null, InteractionAdvisor.forTesting()));
          assertThrowsExactly(NullPointerException.class, ()->advise(vetoReason("foo"), null));
      }
  
      // -- HELPER
  
      private void advise(VetoReason vetoReason, InteractionAdvisor forTesting) {
          builder.addAdvise(vetoReason, forTesting);
      }
  
  
      static Consent.VetoReason vetoReason(final String reasonString) {
          return Consent.VetoReason.explicit(reasonString);
      }
  
      static String extractReason(final InteractionResult result) {
          return result.vetoReason().map(VetoReason::string).orElse(null);
      }
  
  }
  