Get test case name

[adriangb]

When using case::some_description would it be possible to also get that value as a parameter to the test function? My use case is writing a file / snapshot test with my data so I'd like to re-use that identifier for the filename.

[la10736]

You can use the current thread name instead.... see https://github.com/la10736/rstest/blob/master/rstest_test/src/utils.rs#L349
I've planned to write a fixture for it but I never did it 😢

Anyway you can write a fixture

#[fixture]
pub fn testname() -> String {
    thread::current().name().unwrap().to_string()
}

and use it in your own test:

#[rstest]
#[case("my_test")]
fn my_test(testname: String, v: &str) {
    assert!(testname.contains(v);
}

I didn't try it but should work

[adriangb]

Hmm not sure I’m understanding. What I meant is something like:

#[rstest]
#[case::case1("case1")]
#[case::case2("case2")]
fn my_test(case_name: &str, v: &str) {
    assert_eq!(case_name, v)
}

[la10736]

I mean that if you run cargo test -- --nocapture on the follow code

use rstest::*;
use std::thread;

#[fixture]
pub fn testname() -> String {
    thread::current().name().unwrap().to_string()
}

#[rstest]
#[case("my_test")]
#[should_panic]
#[case("something_else")]
fn my_test(testname: String, #[case] v: &str) {
    assert!(dbg!(testname).contains(v));
}

You'll see the follow output

mdamico@miklap:~/dev_random/t_117$ cargo test -- --nocapture
   Compiling t_117 v0.1.0 (/home/mdamico/dev_random/t_117)
    Finished test [unoptimized + debuginfo] target(s) in 0.19s
     Running unittests src/lib.rs (target/debug/deps/t_117-755bac183b006419)

running 2 tests
[src/lib.rs:14] testname = "my_test::case_1"
[src/lib.rs:14] testname = "my_test::case_2"
thread 'my_test::case_2' panicked at 'assertion failed: dbg!(testname).contains(v)', src/lib.rs:14:5
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
test my_test::case_1 ... ok
test my_test::case_2 - should panic ... ok

test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s

   Doc-tests t_117

running 0 tests

test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s

As you can see testname fixture is exactly the name of the test.

[la10736]

I forgot to mention that is not so hard to get description from the test name.
I understand that you would like to have the description available in the test. It could be a possibility to introduce something like

use rstest::{rstest, Ctx};

#[rstest]
#[case::case1("case1")]
#[case::case2("case2")]
fn my_test(#[context] ctx: Ctx, v: &str) {
    assert_eq!(ctx.description().unwrap(), v)
}

It could be useful and clean.

I hope to have some time to implement it.... but is quite hard 😢

[adriangb]

Here’s what I ended up with: https://github.com/adriangb/pgpq/blob/b0b0f8c77c862c0483d81571e76f3a2b746136fc/pgpq/src/lib.rs#L649-L669

thanks for the help and crate!

[la10736]

I don't want to lose the context idea.