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src/domain/teachingDesign.test.ts

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+import { describe, expect, expectTypeOf, it } from 'vitest'
+import {
+  BOOK_SCHEMA_VERSION,
+  createEmptyBook,
+  createEmptyTeachingDesign,
+  createTeachingStep,
+  type DesignId,
+  type TeachingBook,
+  type TeachingDesign,
+} from './teachingDesign'
+
+describe('createTeachingStep', () => {
+  it('creates a named step with editable defaults and an ID', () => {
+    const step = createTeachingStep(3)
+
+    expect(step.id).not.toBe('')
+    expect(step).toMatchObject({
+      name: '3. 教学环节',
+      duration: '',
+      content: '',
+      teacherActivity: '',
+      studentActivity: '',
+      intention: '',
+    })
+  })
+})
+
+describe('createEmptyTeachingDesign', () => {
+  it('creates editable defaults for missing lesson sections', () => {
+    const design = createEmptyTeachingDesign('8.md')
+
+    expect(design.id).not.toBe('')
+    expect(design.originalFilename).toBe('8.md')
+    expect(design.processSteps).toHaveLength(1)
+    expect(design.processSteps[0]?.id).not.toBe('')
+    expect(design.boardDesign).toBe('')
+    expect(design.warnings).toEqual([])
+  })
+
+  it('creates independent nested state for each design', () => {
+    const first = createEmptyTeachingDesign('1.md')
+    const second = createEmptyTeachingDesign('2.md')
+
+    first.processSteps[0]!.name = 'Changed'
+    first.warnings.push({ code: 'missing-title', message: 'Missing title' })
+
+    expect(first.id).not.toBe(second.id)
+    expect(first.processSteps).not.toBe(second.processSteps)
+    expect(first.processSteps[0]).not.toBe(second.processSteps[0])
+    expect(second.processSteps[0]?.name).toBe('1. 教学环节')
+    expect(second.warnings).toEqual([])
+  })
+})
+
+describe('createEmptyBook', () => {
+  it('creates the schema defaults with cover selected and an ISO timestamp', () => {
+    const book = createEmptyBook()
+
+    expect(book.schemaVersion).toBe(BOOK_SCHEMA_VERSION)
+    expect(book.selectedId).toBe('cover')
+    expect(new Date(book.updatedAt).toISOString()).toBe(book.updatedAt)
+  })
+
+  it('creates independent cover and design collections', () => {
+    const first = createEmptyBook()
+    const second = createEmptyBook()
+
+    first.cover.courseName = 'Changed'
+    first.designs.push(createEmptyTeachingDesign('1.md'))
+
+    expect(first.cover).not.toBe(second.cover)
+    expect(first.designs).not.toBe(second.designs)
+    expect(second.cover.courseName).toBe('')
+    expect(second.designs).toEqual([])
+  })
+})
+
+describe('domain types', () => {
+  it('uses branded string design IDs and literal schema versions', () => {
+    expectTypeOf<DesignId>().toExtend<string>()
+    expectTypeOf<TeachingDesign['id']>().toEqualTypeOf<DesignId>()
+    expectTypeOf<TeachingBook['selectedId']>().toEqualTypeOf<'cover' | DesignId>()
+    expectTypeOf<TeachingBook['schemaVersion']>().toEqualTypeOf<
+      typeof BOOK_SCHEMA_VERSION
+    >()
+  })
+})