migrate angular 21 tests

src/app/modules/songs/services/file-data.service.spec.ts

@@ -1,12 +1,68 @@
 import {TestBed} from '@angular/core/testing';
-
+import {of} from 'rxjs';
+import {DbService} from '../../../services/db.service';
 import {FileDataService} from './file-data.service';
 
 describe('FileDataService', () => {
-  beforeEach(() => void TestBed.configureTestingModule({}));
+  let service: FileDataService;
+  let filesCollectionValueChangesSpy: jasmine.Spy;
+  let filesCollectionAddSpy: jasmine.Spy;
+  let songDocCollectionSpy: jasmine.Spy;
+  let songDocSpy: jasmine.Spy;
+  let fileDeleteSpy: jasmine.Spy;
+  let dbServiceSpy: jasmine.SpyObj<DbService>;
+
+  beforeEach(() => {
+    filesCollectionValueChangesSpy = jasmine.createSpy('valueChanges').and.returnValue(of([{id: 'file-1', name: 'plan.pdf'}]));
+    filesCollectionAddSpy = jasmine.createSpy('add').and.resolveTo({id: 'file-2'});
+    songDocCollectionSpy = jasmine.createSpy('collection').and.returnValue({
+      add: filesCollectionAddSpy,
+      valueChanges: filesCollectionValueChangesSpy,
+    });
+    songDocSpy = jasmine.createSpy('songDoc').and.callFake((path: string) => {
+      if (path.includes('/files/')) {
+        return {delete: fileDeleteSpy};
+      }
+
+      return {collection: songDocCollectionSpy};
+    });
+    fileDeleteSpy = jasmine.createSpy('delete').and.resolveTo();
+    dbServiceSpy = jasmine.createSpyObj<DbService>('DbService', ['doc']);
+    dbServiceSpy.doc.and.callFake(songDocSpy);
+
+    void TestBed.configureTestingModule({
+      providers: [{provide: DbService, useValue: dbServiceSpy}],
+    });
+
+    service = TestBed.inject(FileDataService);
+  });
 
   it('should be created', () => {
-    const service: FileDataService = TestBed.inject(FileDataService);
-    void expect(service).toBeTruthy();
+    expect(service).toBeTruthy();
+  });
+
+  it('should add files to the song files subcollection and return the generated id', async () => {
+    const file = {name: 'setlist.pdf', path: 'songs/song-1/files', createdAt: new Date()};
+
+    await expectAsync(service.set('song-1', file)).toBeResolvedTo('file-2');
+
+    expect(songDocSpy).toHaveBeenCalledWith('songs/song-1');
+    expect(songDocCollectionSpy).toHaveBeenCalledWith('files');
+    expect(filesCollectionAddSpy).toHaveBeenCalledWith(file);
+  });
+
+  it('should delete files from the nested file document path', async () => {
+    await service.delete('song-4', 'file-9');
+
+    expect(songDocSpy).toHaveBeenCalledWith('songs/song-4/files/file-9');
+    expect(fileDeleteSpy).toHaveBeenCalled();
+  });
+
+  it('should read files from the files subcollection with the id field attached', () => {
+    service.read$('song-3').subscribe();
+
+    expect(songDocSpy).toHaveBeenCalledWith('songs/song-3');
+    expect(songDocCollectionSpy).toHaveBeenCalledWith('files');
+    expect(filesCollectionValueChangesSpy).toHaveBeenCalledWith({idField: 'id'});
   });
 });