102039: Use patch to delete multiple bitstreams at once

src/app/shared/testing/bitstream-data-service.stub.ts

@@ -0,0 +1,13 @@
+import { Bitstream } from '../../core/shared/bitstream.model';
+import { Observable, of as observableOf } from 'rxjs';
+import { RemoteData } from '../../core/data/remote-data';
+import { NoContent } from '../../core/shared/NoContent.model';
+import { RequestEntryState } from '../../core/data/request-entry-state.model';
+
+export class BitstreamDataServiceStub {
+
+  removeMultiple(_bitstreams: Bitstream[]): Observable<RemoteData<NoContent>> {
+    return observableOf(new RemoteData(0, 0, 0, RequestEntryState.Success));
+  }
+
+}