test(policy-workbench): add signature footer model serialization spec

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

Author: vitormattos

src/tests/views/Settings/PolicyWorkbench/signatureFooterModel.spec.ts

@@ -0,0 +1,55 @@
+/*
+ * SPDX-FileCopyrightText: 2026 LibreSign contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+import { describe, expect, it } from 'vitest'
+
+import {
+	getDefaultSignatureFooterPolicyConfig,
+	normalizeSignatureFooterPolicyConfig,
+	serializeSignatureFooterPolicyConfig,
+} from '../../../../views/Settings/PolicyWorkbench/settings/signature-footer/model'
+
+describe('signature-footer model', () => {
+	it('normalizes legacy boolean values', () => {
+		expect(normalizeSignatureFooterPolicyConfig(true)).toEqual({
+			enabled: true,
+			writeQrcodeOnFooter: true,
+			validationSite: '',
+			customizeFooterTemplate: false,
+		})
+
+		expect(normalizeSignatureFooterPolicyConfig('0')).toEqual({
+			enabled: false,
+			writeQrcodeOnFooter: true,
+			validationSite: '',
+			customizeFooterTemplate: false,
+		})
+	})
+
+	it('normalizes structured JSON payload', () => {
+		const payload = '{"enabled":true,"writeQrcodeOnFooter":false,"validationSite":"https://validation.example","customizeFooterTemplate":true}'
+		expect(normalizeSignatureFooterPolicyConfig(payload)).toEqual({
+			enabled: true,
+			writeQrcodeOnFooter: false,
+			validationSite: 'https://validation.example',
+			customizeFooterTemplate: true,
+		})
+	})
+
+	it('serializes canonical payload from config object', () => {
+		const serialized = serializeSignatureFooterPolicyConfig({
+			enabled: true,
+			writeQrcodeOnFooter: true,
+			validationSite: '',
+			customizeFooterTemplate: false,
+		})
+
+		expect(serialized).toBe('{"enabled":true,"writeQrcodeOnFooter":true,"validationSite":"","customizeFooterTemplate":false}')
+	})
+
+	it('returns defaults when payload is empty', () => {
+		expect(normalizeSignatureFooterPolicyConfig('')).toEqual(getDefaultSignatureFooterPolicyConfig())
+	})
+})