Add unified IM channel plugin

test/host.test.mjs

@@ -0,0 +1,34 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+
+import { createImHostPlugin, inject, name } from '../plugin-src/host/index.mjs';
+
+test('Host composes Feishu and Weixin inside one plugin context', async () => {
+  const calls = [];
+  const plugin = createImHostPlugin({
+    applyFeishu: async (ctx, config) => calls.push(['feishu', ctx, config]),
+    applyWeixin: async (ctx, config) => calls.push(['weixin', ctx, config]),
+  });
+  const ctx = { marker: 'shared-context' };
+  const config = { feishu: { domain: 'feishu' }, weixin: { timeout: 30 } };
+
+  await plugin.apply(ctx, config);
+
+  assert.equal(name, 'dsh-im-host');
+  assert.deepEqual(inject, ['connection', 'credentials', 'webServer']);
+  assert.deepEqual(calls, [
+    ['feishu', ctx, config.feishu],
+    ['weixin', ctx, config.weixin],
+  ]);
+});
+
+test('Host does not start Weixin when Feishu activation fails', async () => {
+  let weixinStarted = false;
+  const plugin = createImHostPlugin({
+    applyFeishu: async () => { throw new Error('feishu unavailable'); },
+    applyWeixin: async () => { weixinStarted = true; },
+  });
+
+  await assert.rejects(() => plugin.apply({}, {}), /feishu unavailable/);
+  assert.equal(weixinStarted, false);
+});