Cookie expiration

[thomasdestouches]

Hi!
I wanted to test whether my plumber API responds to a specific request with a cookie that should have and max age 15 minutes. My tests fail because it seems that no matter what value I enter for expiration in the following expression, the max age of the cookie received when using callthat is around 13 seconds.

res$setCookie(name = "mycookie", value = ", expiration = 900)

However, when I query my API through a web browser, I see that the cookie has the desired max age. Is it something I can do to have the same behaviour in callthat?