cypress 10 migration (#777)

* cypress 10 migration

* fix lint

cypress/e2e/unit/contextmenu.cy.js

@@ -0,0 +1,58 @@
+import * as contextmenu from '../../../instrumented/editor/contextmenu.js'
+
+describe('contextmenu', function () {
+  /**
+   * Tear down tests, resetting custom menus.
+   * @returns {void}
+   */
+  afterEach(() => {
+    contextmenu.resetCustomMenus()
+  })
+
+  it('Test svgedit.contextmenu package', function () {
+    assert.ok(contextmenu, 'contextmenu registered correctly')
+    assert.ok(contextmenu.add, 'add registered correctly')
+    assert.ok(contextmenu.hasCustomHandler, 'contextmenu hasCustomHandler registered correctly')
+    assert.ok(contextmenu.getCustomHandler, 'contextmenu getCustomHandler registered correctly')
+  })
+
+  it('Test svgedit.contextmenu does not add invalid menu item', function () {
+    assert.throws(
+      () => contextmenu.add({ id: 'justanid' }),
+      null, null,
+      'menu item with just an id is invalid'
+    )
+
+    assert.throws(
+      () => contextmenu.add({ id: 'idandlabel', label: 'anicelabel' }),
+      null, null,
+      'menu item with just an id and label is invalid'
+    )
+
+    assert.throws(
+      () => contextmenu.add({ id: 'idandlabel', label: 'anicelabel', action: 'notafunction' }),
+      null, null,
+      'menu item with action that is not a function is invalid'
+    )
+  })
+
+  it('Test svgedit.contextmenu adds valid menu item', function () {
+    const validItem = { id: 'valid', label: 'anicelabel', action () { /* empty fn */ } }
+    contextmenu.add(validItem)
+
+    assert.ok(contextmenu.hasCustomHandler('valid'), 'Valid menu item is added.')
+    assert.equal(contextmenu.getCustomHandler('valid'), validItem.action, 'Valid menu action is added.')
+  })
+
+  it('Test svgedit.contextmenu rejects valid duplicate menu item id', function () {
+    const validItem1 = { id: 'valid', label: 'anicelabel', action () { /* empty fn */ } }
+    const validItem2 = { id: 'valid', label: 'anicelabel', action () { /* empty fn */ } }
+    contextmenu.add(validItem1)
+
+    assert.throws(
+      () => contextmenu.add(validItem2),
+      null, null,
+      'duplicate menu item is rejected.'
+    )
+  })
+})