env TESTGO_VERSION=go1.21
env TESTGO_VERSION_SWITCH=switch

# Control case: get module@version should switch toolchain versions.
cp go.mod.orig go.mod
go get example.com/increasegoreq@v0.0.2
stderr 'go: module example.com/increasegoreq@v0.0.2 requires go >= 1.23; switching to go1.23.9'
cmp go.mod go.mod.want

# #79917: get ./... should also switch toolchain versions.
cp go.mod.orig go.mod
go get -u ./...
stderr 'go: module example.com/increasegoreq@v0.0.2 requires go >= 1.23; switching to go1.23.9'
cmp go.mod go.mod.want

# go get -u without arguments (default to .) should also switch toolchains
cp go.mod.orig go.mod
go get -u
stderr 'go: module example.com/increasegoreq@v0.0.2 requires go >= 1.23; switching to go1.23.9'
cmp go.mod go.mod.want

-- go.mod.orig --
module m

go 1.21

require example.com/increasegoreq v0.0.1
-- go.mod.want --
module m

go 1.23

require example.com/increasegoreq v0.0.2
-- main.go --
package main

import _ "example.com/increasegoreq"

func main() {}