test(server): copri l'endpoint /spot/list e il serving statico dei video

Aggiunge una cartella spot temporanea ai fixture del routing: elenco
ordinato dei soli .mp4, file serviti da /spot/<file>, [] se la
cartella non esiste.

tests/integration/server.test.js

@@ -4,11 +4,12 @@ import { tmpdir } from 'os'
 import { join } from 'path'
 import { createApp } from '../../server.js'
 
-// Usiamo una dist temporanea con file marcatori, così il test non dipende da
-// una build reale ed è deterministico.
+// Usiamo una dist e una cartella spot temporanee con file marcatori, così il
+// test non dipende da una build reale ed è deterministico.
 let server
 let baseUrl
 let distDir
+let spotDir
 
 beforeAll(async () => {
     distDir = mkdtempSync(join(tmpdir(), 'segnapunti-dist-'))
@@ -16,7 +17,12 @@ beforeAll(async () => {
     writeFileSync(join(distDir, 'controller.html'), 'CONTROLLER_MARKER')
     writeFileSync(join(distDir, 'app.js'), 'ASSET_MARKER')
 
-    const app = createApp(distDir)
+    spotDir = mkdtempSync(join(tmpdir(), 'segnapunti-spot-'))
+    writeFileSync(join(spotDir, 'b.mp4'), 'VIDEO_B')
+    writeFileSync(join(spotDir, 'a.mp4'), 'VIDEO_A')
+    writeFileSync(join(spotDir, 'note.txt'), 'NON_VIDEO')
+
+    const app = createApp(distDir, spotDir)
     await new Promise((resolve) => {
         server = app.listen(0, () => {
             baseUrl = `http://127.0.0.1:${server.address().port}`
@@ -28,6 +34,7 @@ beforeAll(async () => {
 afterAll(async () => {
     await new Promise((resolve) => server.close(resolve))
     rmSync(distDir, { recursive: true, force: true })
+    rmSync(spotDir, { recursive: true, force: true })
 })
 
 async function get(path) {
@@ -63,4 +70,30 @@ describe('Routing server (server.js)', () => {
         expect(status).toBe(200)
         expect(body).toBe('ASSET_MARKER')
     })
+
+    it('GET /spot/list elenca i soli .mp4 in ordine alfabetico', async () => {
+        const res = await fetch(baseUrl + '/spot/list')
+        expect(res.status).toBe(200)
+        expect(await res.json()).toEqual(['a.mp4', 'b.mp4'])
+    })
+
+    it('serve i video staticamente da /spot/<file>', async () => {
+        const { status, body } = await get('/spot/a.mp4')
+        expect(status).toBe(200)
+        expect(body).toBe('VIDEO_A')
+    })
+
+    it('GET /spot/list ritorna [] se la cartella spot non esiste', async () => {
+        const app = createApp(distDir, join(spotDir, 'inesistente'))
+        const srv = await new Promise((resolve) => {
+            const s = app.listen(0, () => resolve(s))
+        })
+        try {
+            const res = await fetch(`http://127.0.0.1:${srv.address().port}/spot/list`)
+            expect(res.status).toBe(200)
+            expect(await res.json()).toEqual([])
+        } finally {
+            await new Promise((resolve) => srv.close(resolve))
+        }
+    })
 })