filename := "file.go"    // not a Mach-O file
	_, err := Open(filename) // don't crash
	if err == nil {
		t.Errorf("open %s: succeeded unexpectedly", filename)
	}
}

func TestOpenFat(t *testing.T) {
	ff, err := openFatObscured("testdata/fat-gcc-386-amd64-darwin-exec.base64")
	if err != nil {
		t.Fatal(err)
	}

	if ff.Magic != MagicFat {