fix(test): fix test for http2 with null socket

Author: wesleytodd

test/test.js

@@ -616,11 +616,8 @@ var topDescribe = function (type, createServer) {
           })
         }))
           .get('/')
-          .end(function () {
-            assert.strictEqual(this.res.statusCode, 200)
-            assert.strictEqual(this.res.text, 'ok')
-            done()
-          })
+          .expect(200)
+          .end(done)
       })
     })
   }