t.Fatalf("got (%d, %v); want (0, io.EOF)", n, err)
			}
			n, err = c.Write(b[:])
			if err == nil {
				t.Fatalf("got (%d, %v); want (any, error)", n, err)
			}
		})
	}
}

func TestConnClose(t *testing.T) {
	t.Parallel()
	for _, network := range []string{"tcp", "unix", "unixpacket"} {
		network := network
		t.Run(network, func(t *testing.T) {
			if !testableNetwork(network) {