env TESTGO_VERSION=go1.21
env TESTGO_VERSION_SWITCH=switch

# GOTOOLCHAIN=auto should run the newer toolchain
env GOTOOLCHAIN=auto
cp go.mod.new go.mod
go get rsc.io/needgo121 rsc.io/needgo122 rsc.io/needgo123 rsc.io/needall
stderr '^go: rsc.io/needall@v0.0.1 requires go >= 1.23; switching to go1.23.9$'
! stderr '\(running'
stderr '^go: added rsc.io/needall v0.0.1'
grep 'go 1.23' go.mod
grep 'toolchain go1.23.9' go.mod

# GOTOOLCHAIN=min+auto should run the newer toolchain
env GOTOOLCHAIN=go1.21+auto
cp go.mod.new go.mod
go get rsc.io/needgo121 rsc.io/needgo122 rsc.io/needgo123 rsc.io/needall
stderr '^go: rsc.io/needall@v0.0.1 requires go >= 1.23; switching to go1.23.9$'
! stderr '\(running'
stderr '^go: added rsc.io/needall v0.0.1'
grep 'go 1.23' go.mod
grep 'toolchain go1.23.9' go.mod

# GOTOOLCHAIN=go1.21 should NOT run the newer toolchain
env GOTOOLCHAIN=go1.21
cp go.mod.new go.mod
! go get rsc.io/needgo121 rsc.io/needgo122 rsc.io/needgo123 rsc.io/needall
! stderr switching
stderr 'rsc.io/needgo122@v0.0.1 requires go >= 1.22'
stderr 'rsc.io/needgo123@v0.0.1 requires go >= 1.23'
stderr 'rsc.io/needall@v0.0.1 requires go >= 1.23'
stderr 'requires go >= 1.23'
! stderr 'requires go >= 1.21' # that's us!
cmp go.mod go.mod.new

# GOTOOLCHAIN=local should NOT run the newer toolchain
env GOTOOLCHAIN=local
cp go.mod.new go.mod
! go get rsc.io/needgo121 rsc.io/needgo122 rsc.io/needgo123 rsc.io/needall
! stderr switching
stderr 'rsc.io/needgo122@v0.0.1 requires go >= 1.22'
stderr 'rsc.io/needgo123@v0.0.1 requires go >= 1.23'
stderr 'rsc.io/needall@v0.0.1 requires go >= 1.23'
stderr 'requires go >= 1.23'
! stderr 'requires go >= 1.21' # that's us!
cmp go.mod go.mod.new

# go get go@1.22 should resolve to the latest 1.22
env GOTOOLCHAIN=local
cp go.mod.new go.mod
! go get go@1.22
stderr '^go: updating go.mod requires go >= 1.22.9 \(running go 1.21; GOTOOLCHAIN=local\)'

env GOTOOLCHAIN=auto
cp go.mod.new go.mod
go get go@1.22
stderr '^go: updating go.mod requires go >= 1.22.9; switching to go1.22.9$'

# go get go@1.22rc1 should use 1.22rc1 exactly, not a later release.
env GOTOOLCHAIN=local
cp go.mod.new go.mod
! go get go@1.22rc1
stderr '^go: updating go.mod requires go >= 1.22rc1 \(running go 1.21; GOTOOLCHAIN=local\)'

env GOTOOLCHAIN=auto
cp go.mod.new go.mod
go get go@1.22rc1
stderr '^go: updating go.mod requires go >= 1.22rc1; switching to go1.22.9$'
stderr '^go: upgraded go 1.1 => 1.22rc1$'
stderr '^go: added toolchain go1.22.9$'

# go get go@1.22.1 should use 1.22.1 exactly, not a later release.
env GOTOOLCHAIN=local
cp go.mod.new go.mod
! go get go@1.22.1
stderr '^go: updating go.mod requires go >= 1.22.1 \(running go 1.21; GOTOOLCHAIN=local\)'

env GOTOOLCHAIN=auto
cp go.mod.new go.mod
go get go@1.22.1
stderr '^go: updating go.mod requires go >= 1.22.1; switching to go1.22.9$'
stderr '^go: upgraded go 1.1 => 1.22.1$'
stderr '^go: added toolchain go1.22.9$'

# go get needgo122 (says 'go 1.22') should use 1.22.0, the earliest release we have available
# (ignoring prereleases).
env GOTOOLCHAIN=local
cp go.mod.new go.mod
! go get rsc.io/needgo122
stderr '^go: rsc.io/needgo122@v0.0.1 requires go >= 1.22 \(running go 1.21; GOTOOLCHAIN=local\)'

env GOTOOLCHAIN=auto
cp go.mod.new go.mod
go get rsc.io/needgo122
stderr '^go: upgraded go 1.1 => 1.22$'
stderr '^go: rsc.io/needgo122@v0.0.1 requires go >= 1.22; switching to go1.22.9$'
stderr '^go: added toolchain go1.22.9$'

# go get needgo1223 (says 'go 1.22.3') should use go 1.22.3
env GOTOOLCHAIN=local
cp go.mod.new go.mod
! go get rsc.io/needgo1223
stderr '^go: rsc.io/needgo1223@v0.0.1 requires go >= 1.22.3 \(running go 1.21; GOTOOLCHAIN=local\)'

env GOTOOLCHAIN=auto
cp go.mod.new go.mod
go get rsc.io/needgo1223
stderr '^go: upgraded go 1.1 => 1.22.3$'
stderr '^go: rsc.io/needgo1223@v0.0.1 requires go >= 1.22.3; switching to go1.22.9$'
stderr '^go: added toolchain go1.22.9$'

# go get needgo124 (says 'go 1.24') should use go 1.24rc1, the only version available
env GOTOOLCHAIN=local
cp go.mod.new go.mod
! go get rsc.io/needgo124
stderr '^go: rsc.io/needgo124@v0.0.1 requires go >= 1.24 \(running go 1.21; GOTOOLCHAIN=local\)'

env GOTOOLCHAIN=auto
cp go.mod.new go.mod
go get rsc.io/needgo124
stderr '^go: rsc.io/needgo124@v0.0.1 requires go >= 1.24; switching to go1.24rc1$'
stderr '^go: upgraded go 1.1 => 1.24$'
stderr '^go: added toolchain go1.24rc1$'

# The -C flag should not happen more than once due to switching.
mkdir dir dir/dir
cp go.mod.new go.mod
cp go.mod.new dir/go.mod
cp go.mod.new dir/dir/go.mod
cp p.go dir/p.go
cp p.go dir/dir/p.go
go get -C dir rsc.io/needgo124
stderr '^go: rsc.io/needgo124@v0.0.1 requires go >= 1.24; switching to go1.24rc1$'
stderr '^go: upgraded go 1.1 => 1.24$'
stderr '^go: added toolchain go1.24rc1$'
cmp go.mod.new go.mod
cmp go.mod.new dir/dir/go.mod
grep 'go 1.24$' dir/go.mod

-- go.mod.new --
module m
go 1.1

-- p.go --
package p