Change https://go.dev/cl/425954 mentions this issue: gopls: Add a parameter to gopls.run_tests for emitting results back as JSON.

I'm taking a stab at this.

https://go-review.git.corp.google.com/c/tools/+/425954 is one quick hot take, using the easiest approach of just passing JSON to protocol.ClientCloser, rather than trying to do something more sweeping. The output is on window/showMessage and looks like this:

window/showMessage. params: {Type:3 Message:{"tests":{"ran":3,"passed":["TestYyy"],"failed":["TestXxx","TestZzz"]},"benchmarks":{"ran":0,"passed":["TestYyy"],"failed":null}}}

The structure is:

type Result struct {
    NumRan int      `json:"ran"`
    Passed []string `json:"passed"`
    Failed []string `json:"failed"`
}
type AllResults struct {
    Tests      *Result `json:"tests"`
    Benchmarks *Result `json:"benchmarks"`
}

@tjdevries is this kind of what you were looking for? Or, are you looking for something different? If so, maybe could you sketch out a "here's what I have in non-JSON form, where's how I would like to see it in JSON" to make the conversation a bit more concrete?

I came up with https://github.com/jadekler/lsprobe as a way to integration test a client and (gopls) server.

Since this has been sitting for a bit now, I'll close the issue. We can circle back around if there's more discussion to be had later! =)

Thanks @jadekler for looking into this!