feat: mm.app() support server event (#65)

eggjs/egg#2146 (comment)

lib/supertest.js

@@ -3,6 +3,7 @@
 const methods = require('methods');
 const Test = require('supertest').Test;
 const http = require('http');
+const _server = Symbol('_server');
 
 // patch from https://github.com/visionmedia/supertest/blob/199506d8dbfe0bb1434fc07c38cdcd1ab4c7c926/index.js#L19
 
@@ -16,9 +17,14 @@ const http = require('http');
  */
 
 module.exports = app => {
-  let server = app.callback();
+  let server = app[_server] || app.callback();
   if (typeof server === 'function') {
     server = http.createServer(server);
+    // cache server, avoid create many times
+    app[_server] = server;
+    // emit server event just like egg-cluster does
+    // https://github.com/eggjs/egg-cluster/blob/master/lib/app_worker.js#L52
+    app.emit('server', server);
   }
   const obj = {};
   for (const method of methods) {

test/app.test.js

@@ -85,6 +85,15 @@ function call(method) {
         .expect('foo')
         .expect(200, done);
     });
+
+    it('should emit server event on app', () => {
+      return app.httpRequest()
+        .get('/keepAliveTimeout')
+        .expect(200)
+        .expect({
+          keepAliveTimeout: 5000,
+        });
+    });
   });
 
   describe(`mm.${method}({ baseDir, plugin=string })`, () => {

test/fixtures/app/app.js

@@ -0,0 +1,7 @@
+'use strict';
+
+module.exports = app => {
+  app.on('server', server => {
+    app.serverKeepAliveTimeout = server.keepAliveTimeout || 5000;
+  });
+};

test/fixtures/app/app/router.js

@@ -1,7 +1,13 @@
 'use strict';
 
-module.exports = function(app) {
+module.exports = app => {
   app.get('/', function* () {
     this.body = 'foo';
   });
+
+  app.get('/keepAliveTimeout', function* () {
+    this.body = {
+      keepAliveTimeout: this.app.serverKeepAliveTimeout,
+    };
+  });
 };