add unit tests

src/app/modules/shows/services/docx.service.spec.ts

@@ -1,5 +1,5 @@
 import {TestBed} from '@angular/core/testing';
-
+import {Packer} from 'docx';
 import {DocxService} from './docx.service';
 
 describe('DocxService', () => {
@@ -13,4 +13,37 @@ describe('DocxService', () => {
   it('should be created', () => {
     void expect(service).toBeTruthy();
   });
+
+  it('should not try to save a document when the required data cannot be prepared', async () => {
+    const prepareDataSpy = spyOn<any>(service, 'prepareData').and.resolveTo(null);
+    const saveAsSpy = spyOn<any>(service, 'saveAs');
+
+    await service.create('show-1');
+
+    expect(prepareDataSpy).toHaveBeenCalledWith('show-1');
+    expect(saveAsSpy).not.toHaveBeenCalled();
+  });
+
+  it('should build and save a docx file when all data is available', async () => {
+    const blob = new Blob(['docx']);
+    const prepareDataSpy = spyOn<any>(service, 'prepareData').and.resolveTo({
+      show: {
+        showType: 'service-worship',
+        date: {toDate: () => new Date('2026-03-10T00:00:00Z')},
+      },
+      songs: [],
+      user: {name: 'Benjamin'},
+      config: {ccliLicenseId: '12345'},
+    });
+    const prepareNewDocumentSpy = spyOn<any>(service, 'prepareNewDocument').and.returnValue({doc: true});
+    const saveAsSpy = spyOn<any>(service, 'saveAs');
+    spyOn(Packer, 'toBlob').and.resolveTo(blob);
+
+    await service.create('show-1', {copyright: true});
+
+    expect(prepareDataSpy).toHaveBeenCalledWith('show-1');
+    expect(prepareNewDocumentSpy).toHaveBeenCalled();
+    expect(Packer.toBlob).toHaveBeenCalledWith({doc: true} as never);
+    expect(saveAsSpy).toHaveBeenCalledWith(blob, jasmine.stringMatching(/\.docx$/));
+  });
 });