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tests/unit/novel-promotion/insert-panel-user-input.test.ts

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+import { describe, expect, it } from 'vitest'
+import { resolveInsertPanelUserInput } from '@/lib/novel-promotion/insert-panel'
+
+describe('insert panel user input normalization', () => {
+  it('uses localized default instruction when AI analyze sends empty input', () => {
+    expect(resolveInsertPanelUserInput({ userInput: '' }, 'zh')).toBe(
+      '请根据前后镜头自动分析并插入一个自然衔接的新分镜。',
+    )
+    expect(resolveInsertPanelUserInput({ userInput: '   ' }, 'en')).toBe(
+      'Automatically analyze the surrounding panels and insert a naturally connected new panel.',
+    )
+  })
+
+  it('prefers explicit user input over fallback prompt or default', () => {
+    expect(resolveInsertPanelUserInput({
+      userInput: '  添加一个特写反应镜头  ',
+      prompt: 'unused prompt',
+    }, 'zh')).toBe('添加一个特写反应镜头')
+  })
+
+  it('falls back to prompt when userInput is missing', () => {
+    expect(resolveInsertPanelUserInput({
+      prompt: '  Insert a pause beat between these panels.  ',
+    }, 'en')).toBe('Insert a pause beat between these panels.')
+  })
+})