dlv test does not pass -test.fuzzcachedir=

[Kentzo]

What version of Delve are you using (dlv version)?

1.26.0

What version of Go are you using? (go version)?

go1.25.5

What operating system and processor architecture are you using?

darwin/arm64

Description

I'm attempting to debug my fuzz test via:

dlv test . -- -test.parallel=1 -test.fuzzminimizetime=0 -test.fuzz FuzzDSO -test.fuzztime=30s

After dlv starts and I continue, the process exits with error:

(dlv) c
testing: -test.fuzzcachedir must be set if -test.fuzz is set
...

Where -test.fuzzcachedir is an internal option flag:

  -test.fuzzcachedir string
    	directory where interesting fuzzing inputs are stored (for use only by cmd/go)

In order to work around this error I need to manually provide -test.fuzzcachedir:

dlv test . -- -test.parallel=1 -test.fuzzminimizetime=0 -test.fuzz FuzzDSO -test.fuzztime=30s -test.fuzzcachedir=./testdata

Instead, I expect dlv test to figure it out without similarly to how go test does.

[aarzilli]

dlv test doesn't work similarly to go test with respect to the way options are handled, that's why you have to prefix them with -test., another more evident thing that go test does and dlv test does not. If you built an executable with go test -c and ran it, it would do the same thing.