go test vs pipes

gistfile1.txt

[avagin@localhost ~]$ cat test_test.go 
package main

import "time"
import "testing"
import "bufio"
import "fmt"
import "os"

func asd() {
	rp, wp, err := os.Pipe()
	if err != nil {
		return
	}

	go func() {
		rpfd := rp.Fd()
		fmt.Fprintf(os.Stderr, "\n%d %d\n", rp.Fd(), wp.Fd())
		sc := bufio.NewScanner(rp)
		for sc.Scan() {
			fmt.Fprintf(os.Stderr, "%s\n", sc.Text())
		}
		rp.Close()
		fmt.Fprintf(os.Stderr, "The end %d\n", rpfd)
	}()
	fmt.Fprintf(wp, "start\n")
	time.Sleep(1000 * time.Millisecond)
	fmt.Fprintf(wp, "end\n")
	time.Sleep(1000 * time.Millisecond)
}

func TestA(t *testing.T) {
	asd()
}

func TestB(t *testing.T) {
	asd()
}

func TestC(t *testing.T) {
	asd()
}
[avagin@localhost ~]$ go test -v test_test.go 
=== RUN TestA

3 4
start
end
The end 3
--- PASS: TestA (2.00 seconds)
=== RUN TestB

3 4
start
end
--- PASS: TestB (2.00 seconds)
=== RUN TestC

5 6
start
end
--- PASS: TestC (2.00 seconds)
PASS
ok  	command-line-arguments	6.005s