func TestReadWrite(t *testing.T) {
	// Test that we get the same data in a write-read roundtrip.

	// Write a symbol, a relocation, and an aux info.
	var buf bytes.Buffer
	w := dummyWriter(&buf)

	var s Sym
	s.SetABI(1)
	s.SetType(uint8(objabi.STEXT))
	s.SetFlag(0x12)
	s.SetSiz(12345)
	s.SetAlign(8)
	s.Write(w)

	var r Reloc
	r.SetOff(12)
	r.SetSiz(4)
	r.SetType(uint16(objabi.R_ADDR))
	r.SetAdd(54321)