# Check that if a proxy does not have a version of a module that could be
# an upgrade, 'go list -m -u' still succeeds.
# We use a local file proxy, since our test proxy doesn't have the behavior
# we want to test, and we don't want it to be too clever.
# Verifies #45305, where proxy.golang.org serves an empty /@v/list (200)
# but has no /@latest (410) because the go.mod at the tip of the default
# branch has a different major version suffix.
env testproxy=$GOPROXY
env GOPROXY=file:///$WORK/proxy
env GOSUMDB=off

# If the proxy does not return a list of versions (404/410)
# or a latest version (404/410), we should see no error.
go list -m example.com/noversion
stdout '^example.com/noversion v0.0.0$'
go list -m -u example.com/noversion
stdout '^example.com/noversion v0.0.0$'

# If the proxy returns an empty list of versions (200, not 404/410)
# but does not have a latest version (404/410), we should see no error.
go list -m example.com/nolatest
stdout '^example.com/nolatest v0.0.0$'
go list -m -u example.com/nolatest
stdout '^example.com/nolatest v0.0.0$'

# If proxy returns an invalid response, we should see an error.
env GOPROXY=$testproxy/invalid
! go list -m -u example.com/nolatest
stderr '^go list -m: loading module retractions for example.com/nolatest@v0.0.0: invalid response from proxy "[^"]*": invalid character ''i'' looking for beginning of value$'

-- go.mod --
module m

go 1.17

require (
	example.com/nolatest v0.0.0
	example.com/noversion v0.0.0
)
-- go.sum --
example.com/nolatest v0.0.0/go.mod h1:HnLrCt6SJga5tCtJ7IzG9dOOCniY3G5C0VT7jfMdS0M=
example.com/noversion v0.0.0/go.mod h1:2RUfWiCYsygSXPM2Igxx0FD3Kq33OnVdxm34eDDhXbQ=
-- $WORK/proxy/example.com/nolatest/@v/list --
-- $WORK/proxy/example.com/nolatest/@v/v0.0.0.info --
{"Version":"v0.0.0"}
-- $WORK/proxy/example.com/nolatest/@v/v0.0.0.mod --
module example.com/nolatest

go 1.17
-- $WORK/proxy/example.com/noversion/@v/v0.0.0.info --
{"Version":"v0.0.0"}
-- $WORK/proxy/example.com/noversion/@v/v0.0.0.mod --
module example.com/noversion

go 1.17