env TESTGO_VERSION=go1.14

# Clear the path so this test doesn't fail if the system running it\
# has a binary named go1.21 or go1.22 on its path.
[GOOS:plan9] env path=
[!GOOS:plan9] env PATH=

# check for invalid toolchain in go.mod
go mod init m
go mod edit -go=1.14 -toolchain=go1.22
! go version
stderr 'go: invalid toolchain: go1.22 is a language version but not a toolchain version \(go1.22.x\)'

rm go.mod
go mod init m
go mod edit -go=1.14 -toolchain=go1.21
! go version
stderr 'go: invalid toolchain: go1.21 is a language version but not a toolchain version \(go1.21.x\)'

rm go.mod
go mod init m
go mod edit -go=1.14 -toolchain=go1.20
! go version
stderr 'go: downloading go1.20 '


# check for invalid GOTOOLCHAIN
env GOTOOLCHAIN=go1.14
go version
stdout 'go1.14'

env GOTOOLCHAIN=go1.20
! go version
stderr 'go: downloading go1.20 '

env GOTOOLCHAIN=go1.21
! go version
stderr 'go: invalid toolchain: go1.21 is a language version but not a toolchain version \(go1.21.x\)'

env GOTOOLCHAIN=go1.22
! go version
stderr 'go: invalid toolchain: go1.22 is a language version but not a toolchain version \(go1.22.x\)'

env GOTOOLCHAIN=go1.20+auto
! go version
stderr 'go: downloading go1.20 '

env GOTOOLCHAIN=go1.21+auto
! go version
stderr 'go: invalid toolchain: go1.21 is a language version but not a toolchain version \(go1.21.x\)'

env GOTOOLCHAIN=go1.22+auto
! go version
stderr 'go: invalid toolchain: go1.22 is a language version but not a toolchain version \(go1.22.x\)'

env GOTOOLCHAIN=go1.21rc3
! go version
stderr 'go: downloading go1.21rc3 '

env GOTOOLCHAIN=go1.22rc2
! go version
stderr 'go: downloading go1.22rc2 '

env GOTOOLCHAIN=go1.66
! go version
stderr 'go: invalid toolchain: go1.66 is a language version but not a toolchain version \(go1.66.x\)'

env GOTOOLCHAIN=go1.18beta2
! go version
stderr 'go: downloading go1.18beta2 '

# go1.X is okay for path lookups
env GOTOOLCHAIN=go1.20+path
! go version
stderr 'go: cannot find "go1.20" in PATH'

env GOTOOLCHAIN=go1.21+path
! go version
stderr 'go: cannot find "go1.21" in PATH'

env GOTOOLCHAIN=go1.22+path
! go version
stderr 'go: cannot find "go1.22" in PATH'

# When a toolchain download takes place, download 1.X.0
env GOTOOLCHAIN=auto
rm go.mod
go mod init m
go mod edit -go=1.300 -toolchain=none
! go version
stderr 'go: downloading go1.300.0 '

rm go.mod
go mod init m
go mod edit -go=1.21 -toolchain=none
! go version
stderr 'go: downloading go1.21.0 '

rm go.mod
go mod init m
go mod edit -go=1.22 -toolchain=none
! go version
stderr 'go: downloading go1.22.0 '

rm go.mod
go mod init m
go mod edit -go=1.15 -toolchain=none
! go version
stderr 'go: downloading go1.15 '