101623: Fix browse-related tests by replacing abstract class

src/app/navbar/navbar.component.spec.ts

@@ -16,7 +16,6 @@ import { RouterTestingModule } from '@angular/router/testing';
 import { BrowseService } from '../core/browse/browse.service';
 import { createSuccessfulRemoteDataObject, createSuccessfulRemoteDataObject$ } from '../shared/remote-data.utils';
 import { buildPaginatedList } from '../core/data/paginated-list.model';
-import { BrowseDefinition } from '../core/shared/browse-definition.model';
 import { BrowseByDataType } from '../browse-by/browse-by-switcher/browse-by-decorator';
 import { Item } from '../core/shared/item.model';
 import { AuthorizationDataService } from '../core/data/feature-authorization/authorization-data.service';
@@ -28,6 +27,9 @@ import { authReducer } from '../core/auth/auth.reducer';
 import { provideMockStore } from '@ngrx/store/testing';
 import { AuthTokenInfo } from '../core/auth/models/auth-token-info.model';
 import { EPersonMock } from '../shared/testing/eperson.mock';
+import { FlatBrowseDefinition } from '../core/shared/flat-browse-definition.model';
+import { ValueListBrowseDefinition } from '../core/shared/value-list-browse-definition.model';
+import { HierarchicalBrowseDefinition } from '../core/shared/hierarchical-browse-definition.model';
 
 let comp: NavbarComponent;
 let fixture: ComponentFixture<NavbarComponent>;
@@ -66,30 +68,35 @@ describe('NavbarComponent', () => {
   beforeEach(waitForAsync(() => {
     browseDefinitions = [
       Object.assign(
-        new BrowseDefinition(), {
+        new FlatBrowseDefinition(), {
           id: 'title',
           dataType: BrowseByDataType.Title,
         }
       ),
       Object.assign(
-        new BrowseDefinition(), {
+        new FlatBrowseDefinition(), {
           id: 'dateissued',
           dataType: BrowseByDataType.Date,
           metadataKeys: ['dc.date.issued']
         }
       ),
       Object.assign(
-        new BrowseDefinition(), {
+        new ValueListBrowseDefinition(), {
           id: 'author',
           dataType: BrowseByDataType.Metadata,
         }
       ),
       Object.assign(
-        new BrowseDefinition(), {
+        new ValueListBrowseDefinition(), {
           id: 'subject',
           dataType: BrowseByDataType.Metadata,
         }
       ),
+      Object.assign(
+        new HierarchicalBrowseDefinition(), {
+          id: 'srsc',
+        }
+      ),
     ];
     initialState = {
       core: {