feat: add Deepseek-backed lesson generation route

server/routes/generate.test.ts

@@ -0,0 +1,101 @@
+import { afterEach, beforeEach, describe, expect, it, mock } from 'bun:test'
+import { Hono } from 'hono'
+import { createGenerateRouter } from './generate'
+
+describe('generate route', () => {
+  let originalFetch: typeof fetch
+
+  beforeEach(() => {
+    originalFetch = globalThis.fetch
+  })
+
+  afterEach(() => {
+    globalThis.fetch = originalFetch
+  })
+
+  it('returns 400 when topic is missing', async () => {
+    const app = new Hono().route('/api/generate', createGenerateRouter('test-key'))
+
+    const res = await app.request('/api/generate', {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({}),
+    })
+
+    expect(res.status).toBe(400)
+  })
+
+  it('returns 500 when DEEPSEEK_API_KEY is not configured', async () => {
+    const app = new Hono().route('/api/generate', createGenerateRouter(undefined))
+
+    const res = await app.request('/api/generate', {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ topic: 'CSS 弹性布局' }),
+    })
+
+    expect(res.status).toBe(500)
+  })
+
+  it('returns parsed markdown on success', async () => {
+    globalThis.fetch = mock(async () =>
+      new Response(
+        JSON.stringify({ choices: [{ message: { content: '# CSS 弹性布局 教学设计' } }] }),
+        { status: 200 },
+      ),
+    ) as unknown as typeof fetch
+
+    const app = new Hono().route('/api/generate', createGenerateRouter('test-key'))
+    const res = await app.request('/api/generate', {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ topic: 'CSS 弹性布局' }),
+    })
+
+    expect(res.status).toBe(200)
+    const body = (await res.json()) as { filename: string; markdown: string }
+    expect(body.filename).toBe('CSS 弹性布局.md')
+    expect(body.markdown).toContain('# CSS 弹性布局 教学设计')
+  })
+
+  it('returns 502 when Deepseek responds with an error status', async () => {
+    globalThis.fetch = mock(async () => new Response('', { status: 401 })) as unknown as typeof fetch
+
+    const app = new Hono().route('/api/generate', createGenerateRouter('test-key'))
+    const res = await app.request('/api/generate', {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ topic: 'CSS 弹性布局' }),
+    })
+
+    expect(res.status).toBe(502)
+  })
+
+  it('returns 502 when fetch throws', async () => {
+    globalThis.fetch = mock(async () => {
+      throw new Error('network error')
+    }) as unknown as typeof fetch
+
+    const app = new Hono().route('/api/generate', createGenerateRouter('test-key'))
+    const res = await app.request('/api/generate', {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ topic: 'CSS 弹性布局' }),
+    })
+
+    expect(res.status).toBe(502)
+  })
+
+  it('returns 502 when Deepseek response has no content', async () => {
+    globalThis.fetch = mock(async () => new Response(JSON.stringify({ choices: [] }), { status: 200 })) as unknown as typeof fetch
+
+    const app = new Hono().route('/api/generate', createGenerateRouter('test-key'))
+    const res = await app.request('/api/generate', {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ topic: 'CSS 弹性布局' }),
+    })
+
+    expect(res.status).toBe(502)
+  })
+})