Updated test

Author: jmitchell38488

test/cookie.test.js

@@ -261,7 +261,7 @@ describe('Koa Session Cookie', () => {
 
       request(app.listen())
         .get('/')
-        .expect('Set-Cookie', /koa:sess=; path=\/; expires=Thu, 19 Nov 1981 08:52:00 GMT/)
+        .expect('Set-Cookie', /koa:sess=; path=\/; expires=Thu, 1 Jan 1970 00:00:00 GMT/)
         .expect('true')
         .expect(200, done);
     });