Feature request: add file & line information to JUnit report

[rursprung]

Motivation

if file and line are present they can be used by various report generators (e.g. when uploading the JUnit result to GitHub as a check result in a workflow, like junit-report-action) to annotate the code with the result.

Proposal

the JUnit generator should fill the file and line information for the tests. it should point to the line which defines the test function (i.e. fn foo() {).

Alternatives

No response

Additional context

i found this description of the JUnit XML structure which has e.g. this example:

        <testcase name="testCase3" classname="Tests.Registration" assertions="3"
            time="0.822" file="tests/registration.code" line="102" />

[sunshowers]

Thanks for the issue. This has come up before — unfortunately, the default libtest runner doesn't provide this info. There are heuristic ways to get this info (e.g. by searching through the source) but they're all a bit janky and I haven't spent too much time investigating.

[rursprung]

for test cases which fail you get the at path/to/source.rs:line:pos (e.g. at src/lib.rs:42:9) line in the error output - it should be possible to parse the text for this & use this to annotate the line which failed?

i guess that's what you meant with heuristics?

[sunshowers]

Ah no not quite, since that would show the point at which it panics rather than where the test is defined.

[rursprung]

it's not great, but it might still be better than nothing?

[rursprung]

btw, i also asked for more detailed JSON output from libtest and it seems that this is on the roadmap, in case you're interested: https://internals.rust-lang.org/t/libtest-provide-position-in-json-output/23169