--format=json might need to generate more info

[ShuiRuTian]

Problem

In some cases, we could not know which package the test belongs to.

Like

    Finished test [optimized + debuginfo] target(s) in 0.08s
     Running unittests src\lib.rs (target\debug\deps\regex_automata-f9e1a19184899f86.exe) // <-- good, it's from regex-automata
...
     Running unittests src\lib.rs (target\debug\deps\regex_lite-0cc4b285a45dbfa1.exe) // <-- good, it's from regex-lite
...
     Running tests/lib.rs (target\debug\deps\integration-d60a2e8ec89aaeb3.exe) // <-- oh no, it's from regex-lite or regex-automata?
...
     Running tests/lib.rs (target\debug\deps\integration-67b4427e13c6296c.exe) // <-- oh no,, it's from regex-lite or regex-automata?
...

In this example, when running for unit tests, we could know the package name.

However, when running for integration tests, we have no idea which integration test is running.

Proposed Solution

For the output event:
{ "type": "suite", "event": "started", "test_count": 3 }

Maybe we could add some more meta info, like
{ "type": "suite", "event": "started", "test_count": 3, package_name: "xxxx" }

Is this possible?

Or we need to change rustc?

Notes

No response

[epage]

The json output is owned by libtest. Moving this issue over there