fix: Fixes issue where lock screen would not use previously active theme (#2372)

packages/ui-services/src/Theme/ActiveThemeList.spec.ts

@@ -0,0 +1,58 @@
+import { ActiveThemeList } from './ActiveThemeList'
+import { ItemManagerInterface } from '@standardnotes/services'
+import { Uuid } from '@standardnotes/domain-core'
+
+describe('ActiveThemeList', () => {
+  let itemManager: ItemManagerInterface
+  let list: ActiveThemeList
+
+  beforeEach(() => {
+    itemManager = {} as ItemManagerInterface
+    itemManager.findItem = jest.fn()
+
+    list = new ActiveThemeList(itemManager)
+  })
+
+  it('should initialize with an empty list', () => {
+    expect(list.getList()).toEqual([])
+  })
+
+  it('should be empty initially', () => {
+    expect(list.isEmpty()).toBe(true)
+  })
+
+  it('should not have items that have not been added', () => {
+    const uuid = Uuid.create('00000000-0000-0000-0000-000000000000').getValue()
+    expect(list.has(uuid)).toBe(false)
+  })
+
+  it('should add an item to the list', () => {
+    const uuid = Uuid.create('00000000-0000-0000-0000-000000000000').getValue()
+    list.add(uuid)
+    expect(list.getList()).toContain(uuid)
+    expect(list.has(uuid)).toBe(true)
+  })
+
+  it('should not add a duplicate item to the list', () => {
+    const uuid = Uuid.create('00000000-0000-0000-0000-000000000000').getValue()
+    list.add(uuid)
+    list.add(uuid)
+    expect(list.getList()).toEqual([uuid])
+  })
+
+  it('should remove an item from the list', () => {
+    const uuid = Uuid.create('00000000-0000-0000-0000-000000000000').getValue()
+    list.add(uuid)
+    list.remove(uuid)
+    expect(list.getList()).not.toContain(uuid)
+    expect(list.has(uuid)).toBe(false)
+  })
+
+  it('should clear the list', () => {
+    const uuid = Uuid.create('00000000-0000-0000-0000-000000000000').getValue()
+    list.add(uuid)
+    list.clear()
+    expect(list.getList()).toEqual([])
+    expect(list.has(uuid)).toBe(false)
+  })
+})