feat: build CoffeeChat mini program and backend

server/test/activities.test.js

@@ -0,0 +1,15 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+import { activityStatus, normalizeActivity } from '../src/lib/activities.js';
+
+test('activityStatus distinguishes upcoming, active and ended', () => {
+  const now = new Date('2026-09-21T12:00:00Z');
+  assert.equal(activityStatus('2026-09-22T12:00:00Z', null, now), 'upcoming');
+  assert.equal(activityStatus('2026-09-21T11:00:00Z', '2026-09-21T13:00:00Z', now), 'active');
+  assert.equal(activityStatus('2026-09-20T11:00:00Z', '2026-09-20T13:00:00Z', now), 'ended');
+});
+test('normalizeActivity supplies stable arrays and numeric count', () => {
+  const value = normalizeActivity({ startsAt: '2026-09-22T12:00:00Z', participantCount: '3' }, new Date('2026-09-21T12:00:00Z'));
+  assert.deepEqual(value.images, []); assert.deepEqual(value.tags, []); assert.equal(value.participantCount, 3);
+});
+

server/test/config.test.js

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+import test from 'node:test';
+import assert from 'node:assert/strict';
+import { loadConfig } from '../src/config.js';
+
+test('production rejects missing secrets', () => assert.throws(() => loadConfig({ NODE_ENV: 'production' }), /Missing environment variables/));
+test('development permits local defaults', () => assert.equal(loadConfig({ NODE_ENV: 'development' }).allowDevLogin, true));
+

server/test/wechat.test.js

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+import test from 'node:test';
+import assert from 'node:assert/strict';
+import { exchangeCode } from '../src/lib/wechat.js';
+
+test('exchangeCode returns WeChat session', async () => {
+  const session = await exchangeCode({ code: 'abc', appId: 'id', appSecret: 'secret', fetchImpl: async (url) => {
+    assert.equal(url.searchParams.get('js_code'), 'abc'); return { ok: true, json: async () => ({ openid: 'openid-1' }) };
+  }});
+  assert.equal(session.openid, 'openid-1');
+});
+test('exchangeCode rejects WeChat API errors', async () => {
+  await assert.rejects(exchangeCode({ code: 'bad', appId: 'id', appSecret: 'secret', fetchImpl: async () => ({ ok: true, json: async () => ({ errcode: 40029, errmsg: 'invalid code' }) }) }), /invalid code/);
+});
+