test(signpdf): cover pdfLoad-scoped visibility behavior

Add unit tests proving PdfEditor is hidden only for pdfLoad-scoped errors
and remains visible for non-pdfLoad errors. Update PdfEditor mock to expose
a stable DOM marker for assertions.

Signed-off-by: Vitor Mattos <1079143+vitormattos@users.noreply.github.com>

Author: vitormattos

src/tests/views/SignPDF/SignPDF.spec.ts

@@ -29,9 +29,7 @@ vi.mock('@nextcloud/capabilities', () => ({
 vi.mock('../../../components/PdfEditor/PdfEditor.vue', () => ({
 	default: {
 		name: 'PdfEditor',
-		render() {
-			return null
-		},
+		template: '<div data-test="pdf-editor" />',
 	},
 }))
 
@@ -214,4 +212,60 @@ describe('SignPDF.vue', () => {
 			},
 		])
 	})
+
+	it('hides PDF only when error scope is pdfLoad', async () => {
+		const SignPDF = (await import('../../../views/SignPDF/SignPDF.vue')).default
+		const { useSignStore } = await import('../../../store/sign.js')
+		const signStore = useSignStore()
+
+		signStore.document = createSignDocument()
+		signStore.errors = [{ message: 'Document not found', scope: 'pdfLoad' }]
+
+		const wrapper = mount(SignPDF, {
+			global: {
+				stubs: {
+					TopBar: true,
+					NcNoteCard: true,
+					NcButton: true,
+				},
+				mocks: {
+					$route: { name: 'TestRoute', params: { uuid: 'uuid-123' }, query: {} },
+				},
+			},
+		})
+
+		wrapper.vm.mounted = true
+		wrapper.vm.pdfBlobs = [new File([new Blob(['pdf'], { type: 'application/pdf' })], 'sample.pdf', { type: 'application/pdf' })]
+		await wrapper.vm.$nextTick()
+
+		expect(wrapper.find('[data-test="pdf-editor"]').exists()).toBe(false)
+	})
+
+	it('keeps PDF visible for non-pdfLoad errors', async () => {
+		const SignPDF = (await import('../../../views/SignPDF/SignPDF.vue')).default
+		const { useSignStore } = await import('../../../store/sign.js')
+		const signStore = useSignStore()
+
+		signStore.document = createSignDocument()
+		signStore.errors = [{ message: 'Certificate validation failed', code: 422 }]
+
+		const wrapper = mount(SignPDF, {
+			global: {
+				stubs: {
+					TopBar: true,
+					NcNoteCard: true,
+					NcButton: true,
+				},
+				mocks: {
+					$route: { name: 'TestRoute', params: { uuid: 'uuid-123' }, query: {} },
+				},
+			},
+		})
+
+		wrapper.vm.mounted = true
+		wrapper.vm.pdfBlobs = [new File([new Blob(['pdf'], { type: 'application/pdf' })], 'sample.pdf', { type: 'application/pdf' })]
+		await wrapper.vm.$nextTick()
+
+		expect(wrapper.find('[data-test="pdf-editor"]').exists()).toBe(true)
+	})
 })