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3d65da0529
`check` failed on main with two failures in one package, and they are one
cause wearing two shapes:
service_test.go:66: state = "satisfied", want wanted
testing.go:1369: TempDir RemoveAll cleanup: ... directory not empty
Every test in service_test.go is about the durable Request that
StartDownload leaves behind, and none is about the download. But the
fixture is an anchored four-track request with a healthy provider, which
is precisely what AutoPickable says yes to -- so Manager.Start fired
`go m.grab(...)`, detached and with context.WithoutCancel, and the tests
raced it. Measured: the request reaches "satisfied" about 100ms after
StartDownload returns, so the first failure is the assertion reading the
next state, and the second is that same goroutine still writing into
t.TempDir() after the test returned.
The fixture now puts the candidate outside the auto-pick size window, so
the grab never starts. That is better than waiting for it: with no
goroutine there is nothing to be slow, and the tests state what they mean
without a timing assumption underneath. A test that does want the
download uses managerFixture and sets its own preferences.
It passed 20 runs under CPU load, but so did the broken version -- this
is a CI-only failure locally, so the cause was proved directly instead:
with the fixture's old preferences the request is observably "satisfied"
within 100ms of StartDownload, which is what CI read.