test(adapters): cover runtime delegation

test/unit/app-structure.test.js

@@ -1,4 +1,4 @@
-import { describe, expect, it } from 'vitest';
+import { afterEach, describe, expect, it, vi } from 'vitest';
 
 import apiHandler, { config as vercelConfig } from '../../adapters/functions/api/index.js';
 import { handler as denoHandler } from '../../adapters/functions/deno.js';
@@ -7,6 +7,24 @@ import { createRequestContext } from '../../src/app/request-context.js';
 import { PLATFORM_CATALOG } from '../../src/config/platform-catalog.js';
 import { normalizeEffectivePath, resolveTarget } from '../../src/routing/resolve-target.js';
 
+afterEach(() => {
+  vi.unstubAllGlobals();
+  vi.restoreAllMocks();
+});
+
+/**
+ * Mocks the upstream fetch used by adapter smoke tests.
+ * @returns {ReturnType<typeof vi.spyOn>} Fetch spy.
+ */
+function mockUpstreamFetch() {
+  return vi.spyOn(globalThis, 'fetch').mockResolvedValue(
+    new Response('adapter-ok', {
+      status: 200,
+      headers: { 'Content-Type': 'text/plain' }
+    })
+  );
+}
+
 describe('Application structure', () => {
   it('builds a shared request context for protocol-aware routing', () => {
     const request = new Request('https://example.com/ip/openai/v1/chat/completions', {
@@ -49,4 +67,65 @@ describe('Application structure', () => {
     expect(typeof onRequest).toBe('function');
     expect(vercelConfig).toEqual({ runtime: 'edge' });
   });
+
+  it('delegates Cloudflare Pages requests through the shared handler with env overrides', async () => {
+    const fetchSpy = mockUpstreamFetch();
+    const waitUntil = vi.fn();
+
+    const response = await onRequest({
+      request: new Request('https://pages.example.com/gh/user/repo/pages-file.txt'),
+      env: { CACHE_DURATION: '42' },
+      params: {},
+      waitUntil,
+      next: async () => new Response('next'),
+      data: {}
+    });
+
+    expect(fetchSpy).toHaveBeenCalledWith(
+      'https://github.com/user/repo/pages-file.txt',
+      expect.objectContaining({ method: 'GET' })
+    );
+    expect(await response.text()).toBe('adapter-ok');
+    expect(response.headers.get('Cache-Control')).toContain('s-maxage=42');
+  });
+
+  it('delegates Netlify/Vercel function requests through the shared handler with env overrides', async () => {
+    const fetchSpy = mockUpstreamFetch();
+
+    const response = await apiHandler(
+      new Request('https://functions.example.com/gh/user/repo/functions-file.txt'),
+      {
+        env: { CACHE_DURATION: '43' },
+        geo: {},
+        waitUntil: vi.fn()
+      }
+    );
+
+    expect(fetchSpy).toHaveBeenCalledWith(
+      'https://github.com/user/repo/functions-file.txt',
+      expect.objectContaining({ method: 'GET' })
+    );
+    expect(await response.text()).toBe('adapter-ok');
+    expect(response.headers.get('Cache-Control')).toContain('s-maxage=43');
+  });
+
+  it('delegates Deno requests through the shared handler with env overrides', async () => {
+    const fetchSpy = mockUpstreamFetch();
+    vi.stubGlobal('Deno', {
+      env: {
+        get: vi.fn(name => (name === 'CACHE_DURATION' ? '44' : undefined))
+      }
+    });
+
+    const response = await denoHandler(
+      new Request('https://deno.example.com/gh/user/repo/deno-file.txt')
+    );
+
+    expect(fetchSpy).toHaveBeenCalledWith(
+      'https://github.com/user/repo/deno-file.txt',
+      expect.objectContaining({ method: 'GET' })
+    );
+    expect(await response.text()).toBe('adapter-ok');
+    expect(response.headers.get('Cache-Control')).toContain('s-maxage=44');
+  });
 });