tc.conn = nil
	assert.Equal(t, noopAddr{}, tc.LocalAddr(), "nil connection, LocalAddr() returns noopAddr")
	assert.Equal(t, noopAddr{}, tc.RemoteAddr(), "nil connection, RemoteAddr() returns noopAddr")
	// Validate the empty strings from noopAddr
	assert.Equal(t, "", noopAddr{}.Network(), "noopAddr Network() returns empty string")
	assert.Equal(t, "", noopAddr{}.String(), "noopAddr String() returns empty string")
}

	u.lock.RLock()
	defer u.lock.RUnlock()
	if u.conn != nil {
		return u.conn.SetWriteDeadline(t)
	}
	return nil
}

type noopAddr struct{}

func (n noopAddr) Network() string { return "" }