increase test coverage

extend test coverage

tests/unit/contextmenu-extra.test.js

@@ -0,0 +1,44 @@
+import { describe, expect, it, beforeEach, vi } from 'vitest'
+
+import {
+  add,
+  getCustomHandler,
+  hasCustomHandler,
+  injectExtendedContextMenuItemsIntoDom,
+  resetCustomMenus
+} from '../../src/editor/contextmenu.js'
+
+describe('contextmenu helpers', () => {
+  beforeEach(() => {
+    document.body.innerHTML = "<ul id='cmenu_canvas'></ul>"
+    resetCustomMenus()
+  })
+
+  it('validates menu entries and prevents duplicates', () => {
+    expect(() => add(null)).toThrow(/must be defined/)
+    add({ id: 'foo', label: 'Foo', action: () => 'ok' })
+    expect(hasCustomHandler('foo')).toBe(true)
+    expect(getCustomHandler('foo')()).toBe('ok')
+    expect(() =>
+      add({ id: 'foo', label: 'Again', action: () => {} })
+    ).toThrow(/already exists/)
+  })
+
+  it('injects extensions into the context menu DOM', () => {
+    const host = document.getElementById('cmenu_canvas')
+    const appended = []
+    host.appendChild = vi.fn((value) => {
+      appended.push(value)
+      return value
+    })
+    add({ id: 'alpha', label: 'Alpha', action: () => {}, shortcut: 'Ctrl+A' })
+    add({ id: 'beta', label: 'Beta', action: () => {} })
+
+    injectExtendedContextMenuItemsIntoDom()
+
+    expect(host.appendChild).toHaveBeenCalledTimes(2)
+    expect(appended[0]).toContain('#alpha')
+    expect(appended[0]).toContain('Ctrl+A')
+    expect(appended[1]).toContain('#beta')
+  })
+})