env GO111MODULE=on
env sumdb=$GOSUMDB
env proxy=$GOPROXY
env GOPROXY GONOPROXY GOSUMDB GONOSUMDB

# rejected proxy fails verification
cp go.mod.orig go.mod
rm go.sum
env GOPROXY=$proxy/sumdb-503
! go get -d rsc.io/quote
stderr 503

# fetch through working proxy is OK
cp go.mod.orig go.mod
rm go.sum
env GOPROXY=$proxy
go get -d rsc.io/quote

# repeated fetch works entirely from cache, does not consult sumdb
cp go.mod.orig go.mod
rm go.sum
env GOPROXY=$proxy/sumdb-503
go get -d rsc.io/quote
rm go.sum

# fetch specific module can work without proxy, using cache or go.sum
cp go.mod.orig go.mod
rm go.sum
env GOPROXY=off
go get -d rsc.io/quote@v1.5.2 # using cache
rm $GOPATH/pkg/mod/cache/download/sumdb/localhost.localdev/sumdb/lookup/rsc.io/quote@v1.5.2
go get -d rsc.io/quote@v1.5.2 # using go.sum

# fetch fails once we lose access to both cache and go.sum
rm go.sum
env GOPROXY=$proxy/sumdb-504
! go get -d rsc.io/quote@v1.5.2
stderr 504

# GOINSECURE does not bypass checksum lookup
env GOINSECURE=rsc.io
env GOPROXY=$proxy/sumdb-504
! go get -d rsc.io/quote@v1.5.2
stderr 504

-- go.mod.orig --
module m