test(signature-footer): update resolveEditorProps tests to expect correct fallback

Replace the two tests that were asserting the broken behavior
(inheritedTemplate overwritten with '' when policy has empty footerTemplate)
with correct expectations:
- empty inheritedValue footerTemplate → falls back to base (system default)
- empty inheritedValue when no inheritedValue property → keeps base
- non-empty inheritedValue footerTemplate → properly overrides base

Also add test for the non-empty case to cover the full matrix.

Signed-off-by: Vitor Mattos <[email protected]>

Author: vitormattos

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

@@ -0,0 +1,79 @@
+/**
+ * SPDX-FileCopyrightText: 2026 LibreCode coop and contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+import { describe, expect, it, vi } from 'vitest'
+
+vi.mock('@nextcloud/l10n', () => ({
+	t: (_app: string, text: string) => text,
+	getLanguage: () => 'en',
+}))
+
+vi.mock('@nextcloud/initial-state', () => ({
+	loadState: (_app: string, _key: string, fallback: unknown) => fallback,
+}))
+
+import { signatureFooterRealDefinition } from '../../../../views/Settings/PolicyWorkbench/settings/signature-footer/realDefinition'
+
+describe('signatureFooterRealDefinition.resolveEditorProps', () => {
+	it('falls back to base inheritedTemplate when policy inheritedValue has no custom footer template', () => {
+		const baseEditorProps = {
+			inheritedTemplate: 'SYSTEM_DEFAULT_TEMPLATE',
+		}
+		const policy = {
+			inheritedValue: '{"enabled":true,"writeQrcodeOnFooter":true,"validationSite":"","customizeFooterTemplate":false,"footerTemplate":"","previewWidth":595,"previewHeight":100,"previewZoom":100}',
+		} as unknown as Parameters<NonNullable<typeof signatureFooterRealDefinition.resolveEditorProps>>[0]
+
+		const resolved = signatureFooterRealDefinition.resolveEditorProps?.(policy, baseEditorProps)
+
+		// When the inherited level has no custom template, the system-level default from loadState must be preserved
+		expect(resolved).toMatchObject({
+			inheritedTemplate: 'SYSTEM_DEFAULT_TEMPLATE',
+		})
+	})
+
+	it('uses inherited policy footer template when non-empty and overrides base', () => {
+		const baseEditorProps = {
+			inheritedTemplate: 'SYSTEM_DEFAULT_TEMPLATE',
+		}
+		const policy = {
+			inheritedValue: '{"enabled":true,"writeQrcodeOnFooter":true,"validationSite":"","customizeFooterTemplate":true,"footerTemplate":"ADMIN_CUSTOM_TEMPLATE","previewWidth":595,"previewHeight":100,"previewZoom":100}',
+		} as unknown as Parameters<NonNullable<typeof signatureFooterRealDefinition.resolveEditorProps>>[0]
+
+		const resolved = signatureFooterRealDefinition.resolveEditorProps?.(policy, baseEditorProps)
+
+		// When the inherited level has a real custom template, that takes precedence over the system default
+		expect(resolved).toMatchObject({
+			inheritedTemplate: 'ADMIN_CUSTOM_TEMPLATE',
+		})
+	})
+
+	it('keeps base inheritedTemplate when policy exists but has no inheritedValue property', () => {
+		const baseEditorProps = {
+			inheritedTemplate: 'BASE_TEMPLATE',
+		}
+		const policy = {
+			effectiveValue: 'parallel',
+		} as unknown as Parameters<NonNullable<typeof signatureFooterRealDefinition.resolveEditorProps>>[0]
+
+		const resolved = signatureFooterRealDefinition.resolveEditorProps?.(policy, baseEditorProps)
+
+		// Policy without inheritedValue property → do not override base
+		expect(resolved).toMatchObject({
+			inheritedTemplate: 'BASE_TEMPLATE',
+		})
+	})
+
+	it('keeps base inheritedTemplate when policy is null', () => {
+		const baseEditorProps = {
+			inheritedTemplate: 'BASE_TEMPLATE',
+		}
+
+		const resolved = signatureFooterRealDefinition.resolveEditorProps?.(null, baseEditorProps)
+
+		expect(resolved).toEqual({
+			inheritedTemplate: 'BASE_TEMPLATE',
+		})
+	})
+})