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   *  to you under the Apache License, Version 2.0 (the
   *  "License"); you may not use this file except in compliance
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   *        http://www.apache.org/licenses/LICENSE-2.0
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  package org.apache.causeway.extensions.secman.applib.user.dom.mixins.perms;
  
  import java.util.List;
  
  import org.junit.jupiter.params.ParameterizedTest;
  import org.junit.jupiter.params.provider.ValueSource;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.mockito.Mockito.mock;
  import static org.mockito.Mockito.when;
  
  import org.apache.causeway.applib.Identifier;
  import org.apache.causeway.applib.id.LogicalType;
  import org.apache.causeway.applib.services.appfeat.ApplicationFeatureId;
  import org.apache.causeway.core.metamodel._testing.MetaModelContext_forTesting;
  import org.apache.causeway.extensions.secman.applib.permission.dom.ApplicationPermissionMode;
  import org.apache.causeway.extensions.secman.applib.permission.dom.ApplicationPermissionRule;
  import org.apache.causeway.extensions.secman.applib.permission.dom.ApplicationPermissionValue;
  import org.apache.causeway.extensions.secman.applib.permission.dom.ApplicationPermissionValueSet;
  import org.apache.causeway.extensions.secman.applib.permission.spi.PermissionsEvaluationService;
  import org.apache.causeway.extensions.secman.applib.user.dom.ApplicationUser;
  
  class UserPermissionViewModelTest {
  
      @ParameterizedTest
      @ValueSource(strings = {"sven", "!@$5:", ""}) // username candidates
      void roundtrip(final String username) {
  
          var featureId = ApplicationFeatureId
                  .fromIdentifier(Identifier.classIdentifier(LogicalType.fqcn(this.getClass())));
  
          var permissionsEvaluationService = mock(PermissionsEvaluationService.class);
  
          var permissions = List.of(new ApplicationPermissionValue(featureId,
                  ApplicationPermissionRule.ALLOW,
                  ApplicationPermissionMode.CHANGING));
  
          var user = mock(ApplicationUser.class);
          when(user.getUsername()).thenReturn(username);
          when(user.getPermissionSet()).thenReturn(new ApplicationPermissionValueSet(
                  permissions,
                  permissionsEvaluationService));
  
          var factoryService = MetaModelContext_forTesting.buildDefault()
                  .getFactoryService();
  
          var vm = UserPermissionViewModel.asViewModel(user, factoryService)
                  .apply(featureId);
  
          // when
          var memento = vm.viewModelMemento();
          var vmAfterRoundtrip = new UserPermissionViewModel(memento);
  
          // then
          assertEquals(username, vmAfterRoundtrip.getUsername());
      }
  
  }
  