LocalResponse, cookies, and index testing

[sjsadowski]

rust: 1.35.0-nightly (7c19e1eed 2019-03-12)
rocket: 0.4.0

I'm trying to advance my tests before I implement, following a standard TDD pattern and I'm running in to a problem and it's driving me batty.

Also: this is my first week working with rust so I know I'm doing something wrong, I just don't know what it is.

I'm trying to simply test for the presence of a cookie; at this stage I don't care that there's anything in the cookie.

My test:

#[test]
fn invalid_post_auth() {
    let client = Client::new(rocket()).expect("valid rocket instance");
    let mut response =
        client.post("/auth")
            .body("username=tester&password=testpass")
            .header(ContentType::Form)
            .dispatch();

    assert_eq!(response.cookies().get("Auth-Token").is_none(), true);
    assert_eq!(response.status(), Status::Unauthorized);
    assert_eq!(response.body_string(), Some(Json(json!({"status": "NOT OK"})).to_string()))
}

However, rustc (via cargo test) complains:

 error[E0277]: the type `[rocket::http::Cookie<'_>]` cannot be indexed by `&str`
  --> src/tests.rs:44:35
   |
44 |     assert_eq!(response.cookies().get("X-Auth-Token").is_none(), true);
   |                                   ^^^ slice indices are of type `usize` or ranges of `usize`
   |
   = help: the trait `std::slice::SliceIndex<[rocket::http::Cookie<'_>]>` is not implemented for `&str`

Now based on what I've read here: https://api.rocket.rs/v0.4/rocket/local/struct.LocalResponse.html#method.cookies and here: https://api.rocket.rs/rocket/http/enum.Cookies.html - I think I should be able to pass an &str to retrieve a specific cookie and just verify it exists (or doesn't). However the help message is clearly telling me that it .get() expects a usize.

So what am I missing here? I don't need a straight answer, if you can just point me to the right place to RTFM, that's good enough.

[jebrosen]

response.cookies() returns a Vec<Cookie>, not a Cookies. You'll need to use something like .find(|c| c.name() == "X-Auth-Token") instead.

That is a bit unusual though, and I think incongruent with both Request and Response.

[sjsadowski]

Thanks for the quick response! Maybe it should be brought in line at some point? For now though I am covered.