test(frontend): verify dialogs 8 toasts and PDF file picker contract

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

Author: vitormattos

src/tests/utils/dialogs-v8.spec.ts

@@ -0,0 +1,35 @@
+/*
+ * SPDX-FileCopyrightText: 2026 LibreSign contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+import { describe, expect, it } from 'vitest'
+import { nextTick } from 'vue'
+import { getFilePickerBuilder, showError, showSuccess, showWarning } from '@nextcloud/dialogs'
+
+describe('dialogs v8 integration', () => {
+	it.each([
+		['success', showSuccess, 'status'],
+		['warning', showWarning, 'status'],
+		['error', showError, 'alert'],
+	] as const)('renders and dismisses a %s toast', async (type, showToast, role) => {
+		const message = `LibreSign ${type} feedback`
+		const toast = showToast(message, { timeout: -1 })
+		await nextTick()
+		const notification = [...document.querySelectorAll(`[role="${role}"]`)]
+			.find(element => element.textContent?.includes(message))
+		expect(notification).toBeDefined()
+		toast.hideToast()
+		await nextTick()
+		expect(notification?.isConnected).toBe(false)
+	})
+
+	it('provides the file picker API used by LibreSign', () => {
+		const picker = getFilePickerBuilder('Select your file')
+			.setMultiSelect(false)
+			.setMimeTypeFilter(['application/pdf'])
+			.addButton({ label: 'Choose', callback: () => undefined })
+			.build()
+		expect(typeof picker.pick).toBe('function')
+	})
+})