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diff --git a/apps/files_sharing/src/lib/SharePermissionsToolBox.spec.js b/apps/files_sharing/src/lib/SharePermissionsToolBox.spec.js
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+++ b/apps/files_sharing/src/lib/SharePermissionsToolBox.spec.js
@@ -0,0 +1,80 @@
+/**
+ * SPDX-FileCopyrightText: 2022 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+import { describe, expect, test } from 'vitest'
+
+import {
+	ATOMIC_PERMISSIONS,
+	BUNDLED_PERMISSIONS,
+	addPermissions,
+	subtractPermissions,
+	hasPermissions,
+	permissionsSetIsValid,
+	togglePermissions,
+	canTogglePermissions,
+} from '../lib/SharePermissionsToolBox.js'
+
+describe('SharePermissionsToolBox', () => {
+	test('Adding permissions', () => {
+		expect(addPermissions(ATOMIC_PERMISSIONS.NONE, ATOMIC_PERMISSIONS.NONE)).toBe(ATOMIC_PERMISSIONS.NONE)
+		expect(addPermissions(ATOMIC_PERMISSIONS.NONE, ATOMIC_PERMISSIONS.READ)).toBe(ATOMIC_PERMISSIONS.READ)
+		expect(addPermissions(ATOMIC_PERMISSIONS.READ, ATOMIC_PERMISSIONS.READ)).toBe(ATOMIC_PERMISSIONS.READ)
+		expect(addPermissions(ATOMIC_PERMISSIONS.READ, ATOMIC_PERMISSIONS.UPDATE)).toBe(ATOMIC_PERMISSIONS.READ | ATOMIC_PERMISSIONS.UPDATE)
+		expect(addPermissions(ATOMIC_PERMISSIONS.READ | ATOMIC_PERMISSIONS.UPDATE, ATOMIC_PERMISSIONS.CREATE | ATOMIC_PERMISSIONS.DELETE | ATOMIC_PERMISSIONS.SHARE)).toBe(BUNDLED_PERMISSIONS.ALL)
+		expect(addPermissions(BUNDLED_PERMISSIONS.ALL, ATOMIC_PERMISSIONS.READ)).toBe(BUNDLED_PERMISSIONS.ALL)
+		expect(addPermissions(BUNDLED_PERMISSIONS.ALL, ATOMIC_PERMISSIONS.NONE)).toBe(BUNDLED_PERMISSIONS.ALL)
+	})
+
+	test('Subtract permissions', () => {
+		expect(subtractPermissions(ATOMIC_PERMISSIONS.READ, ATOMIC_PERMISSIONS.NONE)).toBe(ATOMIC_PERMISSIONS.READ)
+		expect(subtractPermissions(ATOMIC_PERMISSIONS.READ, ATOMIC_PERMISSIONS.READ)).toBe(ATOMIC_PERMISSIONS.NONE)
+		expect(subtractPermissions(ATOMIC_PERMISSIONS.READ, ATOMIC_PERMISSIONS.UPDATE)).toBe(ATOMIC_PERMISSIONS.READ)
+		expect(subtractPermissions(ATOMIC_PERMISSIONS.READ | ATOMIC_PERMISSIONS.UPDATE, ATOMIC_PERMISSIONS.UPDATE)).toBe(ATOMIC_PERMISSIONS.READ)
+		expect(subtractPermissions(ATOMIC_PERMISSIONS.READ | ATOMIC_PERMISSIONS.UPDATE, ATOMIC_PERMISSIONS.CREATE | ATOMIC_PERMISSIONS.DELETE)).toBe(ATOMIC_PERMISSIONS.READ | ATOMIC_PERMISSIONS.UPDATE)
+		expect(subtractPermissions(ATOMIC_PERMISSIONS.READ | ATOMIC_PERMISSIONS.UPDATE, ATOMIC_PERMISSIONS.UPDATE | ATOMIC_PERMISSIONS.DELETE)).toBe(ATOMIC_PERMISSIONS.READ)
+		expect(subtractPermissions(BUNDLED_PERMISSIONS.ALL, ATOMIC_PERMISSIONS.READ)).toBe(ATOMIC_PERMISSIONS.UPDATE | ATOMIC_PERMISSIONS.CREATE | ATOMIC_PERMISSIONS.DELETE | ATOMIC_PERMISSIONS.SHARE)
+	})
+
+	test('Has permissions', () => {
+		expect(hasPermissions(ATOMIC_PERMISSIONS.NONE, ATOMIC_PERMISSIONS.READ)).toBe(false)
+		expect(hasPermissions(ATOMIC_PERMISSIONS.READ, ATOMIC_PERMISSIONS.NONE)).toBe(true)
+		expect(hasPermissions(BUNDLED_PERMISSIONS.READ_ONLY, ATOMIC_PERMISSIONS.READ)).toBe(true)
+		expect(hasPermissions(BUNDLED_PERMISSIONS.READ_ONLY, ATOMIC_PERMISSIONS.UPDATE)).toBe(false)
+		expect(hasPermissions(BUNDLED_PERMISSIONS.READ_ONLY, ATOMIC_PERMISSIONS.DELETE)).toBe(false)
+		expect(hasPermissions(BUNDLED_PERMISSIONS.ALL, ATOMIC_PERMISSIONS.DELETE)).toBe(true)
+	})
+
+	test('Toggle permissions', () => {
+		expect(togglePermissions(BUNDLED_PERMISSIONS.ALL, BUNDLED_PERMISSIONS.UPLOAD_AND_UPDATE)).toBe(ATOMIC_PERMISSIONS.SHARE)
+		expect(togglePermissions(BUNDLED_PERMISSIONS.ALL, BUNDLED_PERMISSIONS.FILE_DROP)).toBe(ATOMIC_PERMISSIONS.READ | ATOMIC_PERMISSIONS.UPDATE | ATOMIC_PERMISSIONS.DELETE | ATOMIC_PERMISSIONS.SHARE)
+		expect(togglePermissions(BUNDLED_PERMISSIONS.ALL, ATOMIC_PERMISSIONS.NONE)).toBe(BUNDLED_PERMISSIONS.ALL)
+		expect(togglePermissions(ATOMIC_PERMISSIONS.NONE, BUNDLED_PERMISSIONS.ALL)).toBe(BUNDLED_PERMISSIONS.ALL)
+		expect(togglePermissions(ATOMIC_PERMISSIONS.READ, BUNDLED_PERMISSIONS.ALL)).toBe(BUNDLED_PERMISSIONS.ALL)
+	})
+
+	test('Permissions set is valid', () => {
+		expect(permissionsSetIsValid(ATOMIC_PERMISSIONS.NONE)).toBe(false)
+		expect(permissionsSetIsValid(ATOMIC_PERMISSIONS.READ)).toBe(true)
+		expect(permissionsSetIsValid(ATOMIC_PERMISSIONS.CREATE)).toBe(true)
+		expect(permissionsSetIsValid(ATOMIC_PERMISSIONS.UPDATE)).toBe(false)
+		expect(permissionsSetIsValid(ATOMIC_PERMISSIONS.DELETE)).toBe(false)
+		expect(permissionsSetIsValid(ATOMIC_PERMISSIONS.READ | ATOMIC_PERMISSIONS.UPDATE)).toBe(true)
+		expect(permissionsSetIsValid(ATOMIC_PERMISSIONS.READ | ATOMIC_PERMISSIONS.DELETE)).toBe(true)
+		expect(permissionsSetIsValid(ATOMIC_PERMISSIONS.CREATE | ATOMIC_PERMISSIONS.UPDATE)).toBe(false)
+		expect(permissionsSetIsValid(ATOMIC_PERMISSIONS.CREATE | ATOMIC_PERMISSIONS.DELETE)).toBe(false)
+		expect(permissionsSetIsValid(ATOMIC_PERMISSIONS.READ | ATOMIC_PERMISSIONS.CREATE | ATOMIC_PERMISSIONS.UPDATE)).toBe(true)
+		expect(permissionsSetIsValid(ATOMIC_PERMISSIONS.READ | ATOMIC_PERMISSIONS.CREATE | ATOMIC_PERMISSIONS.DELETE)).toBe(true)
+	})
+
+	test('Toggle permissions', () => {
+		expect(canTogglePermissions(ATOMIC_PERMISSIONS.READ, ATOMIC_PERMISSIONS.READ)).toBe(false)
+		expect(canTogglePermissions(ATOMIC_PERMISSIONS.CREATE, ATOMIC_PERMISSIONS.READ)).toBe(true)
+		expect(canTogglePermissions(ATOMIC_PERMISSIONS.READ | ATOMIC_PERMISSIONS.UPDATE, ATOMIC_PERMISSIONS.READ)).toBe(false)
+		expect(canTogglePermissions(ATOMIC_PERMISSIONS.READ | ATOMIC_PERMISSIONS.DELETE, ATOMIC_PERMISSIONS.READ)).toBe(false)
+		expect(canTogglePermissions(ATOMIC_PERMISSIONS.READ | ATOMIC_PERMISSIONS.CREATE | ATOMIC_PERMISSIONS.UPDATE, ATOMIC_PERMISSIONS.READ)).toBe(false)
+		expect(canTogglePermissions(ATOMIC_PERMISSIONS.READ | ATOMIC_PERMISSIONS.CREATE | ATOMIC_PERMISSIONS.DELETE, ATOMIC_PERMISSIONS.READ)).toBe(false)
+		expect(canTogglePermissions(ATOMIC_PERMISSIONS.READ | ATOMIC_PERMISSIONS.CREATE | ATOMIC_PERMISSIONS.UPDATE, ATOMIC_PERMISSIONS.CREATE)).toBe(true)
+		expect(canTogglePermissions(ATOMIC_PERMISSIONS.READ | ATOMIC_PERMISSIONS.CREATE | ATOMIC_PERMISSIONS.DELETE, ATOMIC_PERMISSIONS.CREATE)).toBe(true)
+	})
+})