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env GOTOOLCHAIN=auto
env TESTGO_VERSION=go1.21.1
# Basic switch should work.
env TESTGO_VERSION_SWITCH=switch
go version
stdout go1.21.99
# Toolchain target mismatch should be detected.
env TESTGO_VERSION_SWITCH=mismatch
! go version
stderr '^go: toolchain go1.21.1 invoked to provide go1.21.99$'
# Toolchain loop should be detected.
env TESTGO_VERSION_SWITCH=loop
! go version
stderr -count=10 '^go: switching from go1.21.1 to go1.21.99 \[depth 9[0-9]\]$'
stderr -count=1 '^go: switching from go1.21.1 to go1.21.99 \[depth 100\]$'
stderr '^go: too many toolchain switches$'
[short] skip
# Internal env vars should not leak to go test or go run.
env TESTGO_VERSION_SWITCH=switch
go version
stdout go1.21.99
go test
stdout clean
go run .
stdout clean
-- go.mod --
module m
go 1.21.99
-- m_test.go --
package main
import "testing"
func TestEnv(t *testing.T) {
// the check is in func init in m.go
}
-- m.go --
package main
import "os"
func init() {
envs := []string{
"GOTOOLCHAIN_INTERNAL_SWITCH_COUNT",
"GOTOOLCHAIN_INTERNAL_SWITCH_VERSION",
}
for _, e := range envs {
if v := os.Getenv(e); v != "" {
panic("$"+e+"="+v)
}
}
os.Stdout.WriteString("clean\n")
}
func main() {
}
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