[short] skip
env GO111MODULE=off
cd a

# If no timeout is set explicitly, 'go test' should set
# -test.timeout to its internal deadline.
go test -v . --
stdout '10m0s'

# An explicit -timeout argument should be propagated to -test.timeout.
go test -v -timeout 30m . --
stdout '30m0s'

-- a/timeout_test.go --
package t
import (
	"flag"
	"fmt"
	"testing"
)
func TestTimeout(t *testing.T) {
	fmt.Println(flag.Lookup("test.timeout").Value.String())
}