env TESTGO_VERSION=go1.100.0
env TESTGO_VERSION_SWITCH=switch

go get toolchain@go1.22.1
stderr '^go: added toolchain go1.22.1$'
! stderr '(added|removed|upgraded|downgraded) go'
grep 'toolchain go1.22.1' go.mod

go get toolchain@none
stderr '^go: removed toolchain go1.22.1$'
! stderr '(added|removed|upgraded|downgraded) go'
! grep toolchain go.mod

go get toolchain@go1.22.1
stderr '^go: added toolchain go1.22.1$'
! stderr '(added|removed|upgraded|downgraded) go'
grep 'toolchain go1.22.1' go.mod

go get go@1.22.3
stderr '^go: upgraded go 1.10 => 1.22.3$'
stderr '^go: upgraded toolchain go1.22.1 => go1.100.0$'
grep 'go 1.22.3' go.mod

go get go@1.22.3 toolchain@1.22.3
stderr '^go: removed toolchain go1.100.0$'
! grep toolchain go.mod

go get go@1.22.1 toolchain@go1.22.3
stderr '^go: downgraded go 1.22.3 => 1.22.1$'
stderr '^go: added toolchain go1.22.3$'
grep 'go 1.22.1' go.mod
grep 'toolchain go1.22.3' go.mod

go get go@1.22.3 toolchain@1.22.3
stderr '^go: upgraded go 1.22.1 => 1.22.3$'
stderr '^go: removed toolchain go1.22.3$'
grep 'go 1.22.3' go.mod
! grep toolchain go.mod

go get toolchain@1.22.1
stderr '^go: downgraded go 1.22.3 => 1.22.1$'
! stderr toolchain # already gone, was not added
grep 'go 1.22.1' go.mod
! grep toolchain go.mod

env TESTGO_VERSION=go1.22.1
env GOTOOLCHAIN=local
! go get go@1.22.3
stderr 'go: updating go.mod requires go >= 1.22.3 \(running go 1.22.1; GOTOOLCHAIN=local\)$'

env TESTGO_VERSION=go1.30
go get toolchain@1.22.3
grep 'toolchain go1.22.3' go.mod

go get go@1.22.1
grep 'go 1.22.1' go.mod
go get m2@v1.0.0
stderr '^go: upgraded go 1.22.1 => 1.23$'
stderr '^go: added m2 v1.0.0$'
grep 'go 1.23$' go.mod

go get toolchain@go1.23.9 go@1.23.5
go get toolchain@none
stderr '^go: removed toolchain go1.23.9'
! stderr ' go 1'
grep 'go 1.23.5' go.mod

-- go.mod --
module m
go 1.10

replace m2 v1.0.0 => ./m2

-- m2/go.mod --
module m2
go 1.23