test: add response validation

Author: jessicaschelly

apps/meteor/tests/end-to-end/api/rooms.ts

@@ -152,8 +152,10 @@ describe('[Rooms]', () => {
 				.get(api('subscriptions.getOne'))
 				.set(credentials)
 				.query({ roomId: testChannel._id })
+				.expect('Content-Type', 'application/json')
 				.expect(200)
 				.expect((res) => {
+					expect(res.body).to.have.property('success', true);
 					expect(res.body.subscription).to.have.property('draft', draft);
 				});