Function echoOnce

agent/agent_test.go:4171–4187

echoOnce accepts a single connection, reads 4 bytes and echos them back

(t *testing.T, ll net.Listener)

// echoOnce accepts a single connection, reads 4 bytes and echos them back
func echoOnce(t *testing.T, ll net.Listener) {
	t.Helper()
	conn, err := ll.Accept()
	if err != nil {
		return
	}
	defer conn.Close()
	b := make([]byte, 4)
	_, err = conn.Read(b)
	if !assert.NoError(t, err) {
		return
	}
	_, err = conn.Write(b)
	if !assert.NoError(t, err) {
		return
	}
}

// requireEcho sends 4 bytes and requires the read response to match what was sent.
func requireEcho(t *testing.T, conn net.Conn) {