Frontend coverage, at least

src-ui/src/app/components/common/pdf-viewer/pdf-viewer.component.spec.ts

@@ -219,6 +219,25 @@ describe('PngxPdfViewerComponent', () => {
     expect(scaleSpy).not.toHaveBeenCalled()
   })
 
+  it('resets viewer state on src change', () => {
+    const mockViewer = {
+      setDocument: jest.fn(),
+      currentPageNumber: 7,
+      cleanup: jest.fn(),
+    }
+    ;(component as any).pdfViewer = mockViewer
+    ;(component as any).loadingTask = { destroy: jest.fn() }
+    jest.spyOn(component as any, 'loadDocument').mockImplementation(() => {})
+
+    component.src = 'test.pdf'
+    component.ngOnChanges({
+      src: new SimpleChange(undefined, 'test.pdf', true),
+    })
+
+    expect(mockViewer.setDocument).toHaveBeenCalledWith(null)
+    expect(mockViewer.currentPageNumber).toBe(1)
+  })
+
   it('applies viewer state after view init when already loaded', () => {
     const applySpy = jest.spyOn(component as any, 'applyViewerState')
     ;(component as any).hasLoaded = true

src-ui/src/app/components/document-detail/document-detail.component.spec.ts

@@ -410,6 +410,35 @@ describe('DocumentDetailComponent', () => {
     })
   })
 
+  it('should navigate to 404 when root lookup fails', () => {
+    const navigateSpy = jest.spyOn(router, 'navigate')
+    jest
+      .spyOn(activatedRoute, 'paramMap', 'get')
+      .mockReturnValue(of(convertToParamMap({ id: 10, section: 'details' })))
+    jest
+      .spyOn(documentService, 'get')
+      .mockReturnValueOnce(throwError(() => ({ status: 404 }) as any))
+    jest
+      .spyOn(documentService, 'getRootId')
+      .mockReturnValue(throwError(() => new Error('boom')))
+    jest.spyOn(openDocumentsService, 'getOpenDocument').mockReturnValue(null)
+    jest
+      .spyOn(openDocumentsService, 'openDocument')
+      .mockReturnValueOnce(of(true))
+    jest.spyOn(customFieldsService, 'listAll').mockReturnValue(
+      of({
+        count: customFields.length,
+        all: customFields.map((f) => f.id),
+        results: customFields,
+      })
+    )
+
+    fixture.detectChanges()
+    httpTestingController.expectOne(component.previewUrl).flush('preview')
+
+    expect(navigateSpy).toHaveBeenCalledWith(['404'], { replaceUrl: true })
+  })
+
   it('should not render a delete button for the root/original version', () => {
     const docWithVersions = {
       ...doc,

src-ui/src/app/services/rest/document.service.spec.ts

@@ -306,6 +306,14 @@ describe(`DocumentService`, () => {
     req.flush({ root_id: documents[0].id })
   })
 
+  it('should call appropriate api endpoint for getting document versions', () => {
+    subscription = service.getVersions(documents[0].id).subscribe()
+    const req = httpTestingController.expectOne(
+      `${environment.apiBaseUrl}${endpoint}/${documents[0].id}/?fields=id,versions`
+    )
+    expect(req.request.method).toEqual('GET')
+  })
+
   it('should call appropriate api endpoint for deleting a document version', () => {
     subscription = service.deleteVersion(documents[0].id, 10).subscribe()
     const req = httpTestingController.expectOne(